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doc. Dr. Ing. Jan Kyncl

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A novel scheme for control by active and reactive power utilized in gearless variable speed wind turbine system with PMSG connected to the grid

  • DOI: 10.20998/2074-272X.2022.2.09
  • Link: https://doi.org/10.20998/2074-272X.2022.2.09
  • Department: Department of Electrical Power Engineering
  • Annotation:
    As a result of increasing fossil fuel price and state-of-the-art technology, more and more residential and commercial consumers of electricity have been installing wind turbines. The motivation being to cut energy bills and carbon dioxide emissions. Purpose. The main goal of this work is developing a control scheme for a variable speed wind turbine generator in order to produce utmost power from varying wind types, and variable wind speed. Novelty. This research paper presents an IGBT power converter control scheme for active power in relation to wind speed and reactive power by adjusting Q-reference (Qref) value in a gearless variable speed wind turbine with permanent magnet synchronous generator. Methods. An effective modelling and control of the wind turbine with the suggested power converter is executed by utilizing MATLAB/Simulink software. The control scheme consists of both the wind turbine control and the power converter control. Simulation results are utilized in the analysis and deliberation of the ability of the control scheme, which reveals that the wind turbine generator has the capability to actively sustain an electric power grid network, owing to its ability to independently control active and reactive power according to applied reference values at variable wind speed. Practical value. This research can be utilized for assessing the control methodology, the dynamic capabilities and influence of a gearless variable-speed wind energy conversion system on electric power grids. A case study has been presented with a (3·10 MW = 30 MW) wind farm scheme.

Possibilities of Improving COP of Peltier Cells Operating as a Heat Pump

  • Authors: Ing. Jan Rimbala, doc. Dr. Ing. Jan Kyncl,
  • Publication: Proceedings of the 2022 22nd International Scientific Conference on Electric Power Engineering. Ostrava: Vysoká škola báňská - Technická univerzita v Ostravě, 2022. p. 37-40. ISSN 2376-5631. ISBN 978-1-6654-1057-1.
  • Year: 2022
  • DOI: 10.1109/EPE54603.2022.9814133
  • Link: https://doi.org/10.1109/EPE54603.2022.9814133
  • Department: Department of Electrical Power Engineering
  • Annotation:
    Peltier cell (hereinafter PC) has undergone technological development since it's discovery by Joan C. Peltier in 1834, and from the point of view of theoretical physics they can be considered completely explored. They are commonly used for low-power cooling (for example car refrigerators) and for temperature control (controlled electronics cooling), ie mostly in low-power applications from the point of view of the power industry. We are currently experiencing enormous pressure to save energy and use waste heat, so the question arises as to whether it would not be possible to dust off the idea of 'energy' use of PC.

The impact of COVID-19 on electricity prices in Italy, the Czech Republic, and China

  • DOI: 10.3390/app11198793
  • Link: https://doi.org/10.3390/app11198793
  • Department: Department of Electrical Power Engineering
  • Annotation:
    COVID-19 is likely to be the 2020s’ deadliest pandemic according to the World Health Organization (WHO). There have been more than 3.7 million confirmed deaths after 15 months spread. Besides the loss of human lives, COVID-19 has other unfavorable impacts on society, education, and the economy. Due to successive lockdowns and the continuous quarantines, the demands on power resources have reduced. Therefore, there is a need to investigate the impacts of the COVID-19 pandemic on electricity prices (EP). In this paper, a set of six economic factors that are affected by COVID-19 and affect EP are considered. These factors were fed into a functional link artificial neural network (FLANN) to model the relationships between them and the EP. An empirical equation was formulated to help decision makers and strategic developers in the electricity markets come up with more appropriate plans. Italy, the Czech Republic, and China were used as case studies in this research. © 2021 by the authors. Licensee MDPI, Basel, Switzerland.

Primary energy reduction using small CHP systems

  • DOI: 10.1109/EPE51172.2020.9269204
  • Link: https://doi.org/10.1109/EPE51172.2020.9269204
  • Department: Department of Electrical Power Engineering
  • Annotation:
    This work deals with the creation of a control model for a system with CHP units, heat pump and energy storage. By simulating such system, it can be designed and optimized for primary energy consumption and investment. The model also enables extrapolation of the monitored quantities from energy consumption over a known period of time.

The possibilities of reducing energy consumption for the preparation of hot water by suitable switching of the heat pump

  • Authors: Ing. Jan Rimbala, doc. Dr. Ing. Jan Kyncl,
  • Publication: 2020 21st International Scientific Conference on Electric Power Engineering (EPE). Prague: Czechoslovakia Section IEEE, 2020. ISSN 2376-5623. ISBN 978-1-7281-9479-0.
  • Year: 2020
  • DOI: 10.1109/EPE51172.2020.9269251
  • Link: https://doi.org/10.1109/EPE51172.2020.9269251
  • Department: Department of Electrical Power Engineering
  • Annotation:
    The article deals with the possibilities of reducing energy consumption for the preparation of hot water by suitable switching of the air-to-water heat pump according to the expected time course of the outdoor air temperature. Higher temperature of the medium from which we pump heat always leads to an improvement of the heating factor. The article describes an idealized model taking into account two water storage The consumed electrical energy is always evaluated at the worst possible switching time of the heat pump, at a fixed switching time and with optimal switching. The considered procedure may be suitable for buildings with high hot water consumption, such as hospitals, retirement homes, or for small industrial enterprises.

Theoretical measurement limits of parameters of commissioned heat pumps

  • Authors: Ing. Jan Rimbala, doc. Dr. Ing. Jan Kyncl,
  • Publication: 2020 21st International Scientific Conference on Electric Power Engineering (EPE). Prague: Czechoslovakia Section IEEE, 2020. ISSN 2376-5623. ISBN 978-1-7281-9479-0.
  • Year: 2020
  • DOI: 10.1109/EPE51172.2020.9269188
  • Link: https://doi.org/10.1109/EPE51172.2020.9269188
  • Department: Department of Electrical Power Engineering
  • Annotation:
    This paper analyzes the uncertainties of measuring the heat and cooling factors of compressor and absorption heat pumps. The article analyzes the uncertainties of measurement and, in two case studies, it is shown that without the use of laboratory calibrated measuring instruments, the cooling and heating factor plowing is considerably inaccurate and is better based on manufacturer data.

A Study in Options to Improve Aerodynamic Profile of Heavy-Duty Vehicles in Europe

  • Authors: Hariram, A., Koch, T., Mardberg, B., doc. Dr. Ing. Jan Kyncl,
  • Publication: SUSTAINABILITY. 2019, 11(19), ISSN 2071-1050.
  • Year: 2019
  • DOI: 10.3390/su11195519
  • Link: https://doi.org/10.3390/su11195519
  • Department: Department of Electrical Power Engineering
  • Annotation:
    In this paper, we present and discuss different aerodynamic solutions available for European tractor and semi-trailers configurations along with summarizing their impact on the aerodynamic drag that contributes to the reduction of fuel consumption. Combinations of different aerodynamic solutions have been presented, and conclusions have been drawn from comparative studies and experience of the participating partners of Project TRANSFORMERS, but no CFD simulations have been done for the same solutions. The paper concludes by proposing configurations of aerodynamic measures for various configurations and how they can be cost-effectively adapted to improve the efficiency in road freight logistics networks and reduce emission.

Assessment of energy consumption in the residential building with a heat pump

  • Authors: Ing. Jan Rimbala, Ing. Jan Votava, doc. Dr. Ing. Jan Kyncl,
  • Publication: Proceedings of the 2019 20th International Scientific Conference on Electric Power Engineering, EPE 2019. Ostrava: Vysoká škola báňská - Technická univerzita Ostrava. Fakulta elektrotechniky a informatiky, 2019. ISSN 2376-5631. ISBN 978-1-7281-1333-3.
  • Year: 2019
  • DOI: 10.1109/EPE.2019.8778066
  • Link: https://doi.org/10.1109/EPE.2019.8778066
  • Department: Department of Electrical Power Engineering
  • Annotation:
    This paper analyzes the accuracy of the calculation of the energy needed for the heating of residential buildings by heat pumps. The reference value is the consumption obtained from the actual time course of temperature and the heat loss calculated by solving the partial differential equations. This value is compared with the results obtained using average daily and monthly temperatures and using a static wall model without heat capacity. The calculations are performed for the Carnot heat pump and for the currently used WPL18 heat pump.

Improvement of transient stability using STATCOM combined with optimization

  • DOI: 10.1109/EPE.2019.8778105
  • Link: https://doi.org/10.1109/EPE.2019.8778105
  • Department: Department of Electrical Power Engineering
  • Annotation:
    Further improvement of FACTS (Flexible Alternating Current Transmission System) control can help to increase the transient stability of a power system without adding extra grid inertia. Sophisticated optimization algorithms and modern Computer Algebra Systems provide new means of controller synthesis for power systems. The paper presents an approach of enhancement of transient stability using FACTS devices, particularly STATCOM (Static Synchronous Compensators), combined with optimization. Furthermore, chapter 3 describes different ways of defining the objective function. Different approaches are compared using the case study model that was implemented in MATLAB/Simulink.

Optimized use of the steam accumulator in the combined heat and power production

Real time optimization of temperature field in induction heating

  • Authors: Novák, Z., doc. Dr. Ing. Jan Kyncl,
  • Publication: Journal of Electrical Engineering. 2019, 70(5), 386-392. ISSN 1335-3632.
  • Year: 2019
  • DOI: 10.2478/jee-2019-0070
  • Link: https://doi.org/10.2478/jee-2019-0070
  • Department: Department of Electrical Power Engineering
  • Annotation:
    Many induction heating processes must be controlled in accordance with the prescribed time evolution of temperature of the heated body (bodies). This requires a correct setting of field currents (amplitudes and frequencies) in the heating inductors that can vary either continuously or by steps. The paper presents a novel model of induction annealing of cylindrical aluminum billets based on solution of nonstationary forward and inverse tasks. The methodology is described in detail and illustrated with a typical example. Some of the results were verified experimentally.

Different Approaches in Numerical Solution of Continuous Mathematical Models of Induction Machine

  • DOI: 10.1109/EPEPEMC.2018.8521951
  • Link: https://doi.org/10.1109/EPEPEMC.2018.8521951
  • Department: Department of Electric Drives and Traction, Department of Electrical Power Engineering
  • Annotation:
    Important parameters of an induction motor drives include dynamics and efficiency. Both attributes are tightly associated with accurate acquisition of hardly measurable quantities such as magnetic flux (and its position) and motor torque. The mathematical model of the induction machine is used for calculation of these quantities. The model usually comprises of a set of differential equations, that have to be numerically solved inside drive's controller. Computation time requirement and accuracy of the resulting estimation are important parameters of the selected solver. For this purpose, Euler's method was usually used in engineering applications, but with increasing computational throughput of DSP, more complicated numerical methods can be applied too. This paper strives to compare Euler's method with 4 th order Runge-Kutta method.

Energy Consumption Measurements Based on Numerical Integration

  • DOI: 10.1109/EPE.2018.8395973
  • Link: https://doi.org/10.1109/EPE.2018.8395973
  • Department: Department of Electrical Power Engineering
  • Annotation:
    This paper deals with the possibility of energy consumption measurement using numerical integration. In this paper is described method based on Simpson integration and its comparison with standard analytical method of evaluating of energy consumption. The result of this article is a comparison of the error of energy of the analytical and numerical methods, depending on the number of samples required.

Optimization of Local Cogeneration Stations

  • DOI: 10.1109/EPE.2018.8396037
  • Link: https://doi.org/10.1109/EPE.2018.8396037
  • Department: Department of Electrical Power Engineering
  • Annotation:
    This paper presents a mathematical model that is developed to economically optimize a small and a medium-sized local cogeneration system. This model was developed to find the economically optimal configuration of the cogeneration system with respect to state aid, which forms a significant part of the revenue for small and medium-sized systems. The model respects the production of heat, so it won't be exceeded the economically justifiable demand, which means that the same amount of heat will be produced as in the supply of heat through conventional sources, which is essential for obtaining the aid. Therefore, the model is suitable for use in the design of cogeneration systems with average seasonal heat demand up to 5 MW. These are typical hospitals, hotels, office buildings and small factories. The model can design an accumulation tanks and a bivalent heat source to cover the maximum and minimum peaks in heat requirements, it also respects the thermal losses of buildings and climatic data in the given location. It is also possible to design a system for the preparation of hot water during the summer months.

The correction of the influence of wind on thermographic measurement

  • Authors: doc. Dr. Ing. Jan Kyncl, Ing. Lavr Vetoshkin, Ph.D., Musálek, L., Bryscejn, J., Sova, J.
  • Publication: 2016 17th International Scientific Conference on Electric Power Engineering (EPE 2016). New York: IEEE, 2016. International Scientific Conference on Electric Power Engineering. ISBN 978-1-5090-0907-7.
  • Year: 2016
  • DOI: 10.1109/EPE.2016.7521772
  • Link: https://doi.org/10.1109/EPE.2016.7521772
  • Department: Department of Electrical Power Engineering
  • Annotation:
    This paper describes an alternative method of correction of the influence of wind speed within thermographic measurements of power system components. Instead of measurements of wind speed measured temperature of a resistor fed by known electrical power is used. The paper gives theoretical background of the method and measurement's results.

Analysis of voltage transients caused by singleline to ground fault in medium voltage distribution networks

  • Authors: Kanalik, M., Busa, J., doc. Dr. Ing. Jan Kyncl,
  • Publication: Proceedings of the 8th International Scientific Symposium on Electrical Power Engineering ELEKTROENERGETIKA 2015. Košice: TU Košice, 2015. pp. 368-371. ISBN 978-80-553-2187-5.
  • Year: 2015
  • Department: Department of Electrical Power Engineering
  • Annotation:
    The contribution analyzes the impact of distribution power system parameters to magnitude of transients resulting from the single-line to ground faults. For purposes of calculations there was created a mathematical model of 22 kV line supplied from 110/23 kV transformer, in the neutral node of which the Petersen coil was installed. Computation method was based on the solution of the first order system of linear differential equations. The magnitude of voltage transients in nonstationary state was analyzed according to: Petersen coil parameters, place of origin of a single-line to ground fault, and parameters of the HV/MV power transformer.

Configurable and Adaptable Trucks and Trailers for Optimal Transport Efficiency

  • Authors: Elmer, M., doc. Dr. Ing. Jan Kyncl, Barbarino, S., Hariram, A., Wagner, S.
  • Publication: Transportation Electrification Asia-Pacific, 2014 IEEE Conference and Expo. Peking: Chinese Academy of Science, 2014. ISBN 978-1-4799-4239-8.
  • Year: 2014
  • DOI: 10.1109/ITEC-AP.2014.6941146
  • Link: https://doi.org/10.1109/ITEC-AP.2014.6941146
  • Department: Department of Electrical Power Engineering
  • Annotation:
    Today heavy duty trucks are designed and optimized towards a limited variance set of usage and for maximum payload. With European Commission's targets for reducing the consumption of fossil energy resources, increasing transport - and fuel efficiency, future trucks-trailers must be easily adaptable for each freight, load and mission. And during the operation phase, the vehicle combination automatically adjusts itself to the actual driving environment in terms of traffic situation, topology, and payload. The TRANSFORMERS project combines a modular approach for mission rightsizing by means of hybridization, truck engine downsizing and a trailer design that addresses simultaneously aerodynamics and load efficiency improvements. The overall goal is to achieve 25% energy load efficiency (in energy/km.tn) in a real world application taking into account the needs to maintain road infrastructure and traffic safety. This paper will give an introduction to the project, pre-standard for a hybrid on demand vehicle and its objectives towards greening surface transport.

Defining end user metrics for evaluating a hybrid heavy duty commercial vehicle

  • Authors: Hariram, A., doc. Dr. Ing. Jan Kyncl, Barbarino, S.
  • Publication: Transportation Electrification Asia-Pacific, 2014 IEEE Conference and Expo. Peking: Chinese Academy of Science, 2014. ISBN 978-1-4799-4239-8.
  • Year: 2014
  • DOI: 10.1109/ITEC-AP.2014.6940834
  • Link: https://doi.org/10.1109/ITEC-AP.2014.6940834
  • Department: Department of Electrical Power Engineering
  • Annotation:
    At present long and medium distance road freight transport assignments in Europe are mainly carried out by heavy duty diesel propulsion vehicle systems. In Project TransFormers commissioned by the European Commission a Hybrid on Demand solution will be designed and evaluated as an alternative to test the potential of electrically driven slave propulsion system installed in the trailer. The aim of this paper is to provide insight into stakeholder expectations of consumers by means of key success measures for better market acceptance of new vehicle propulsion configuration. The selected performance indicators will be applied for defining and tuning the test case scenarios and for assessing the potential of such a truck-trailer configuration.

Modeling of Dielectric Heating within Lyophilization Process

  • Authors: doc. Dr. Ing. Jan Kyncl, Doubek, J., Musálek, L.
  • Publication: Mathematical Problems in Engineering. 2014, 2014 ISSN 1024-123X.
  • Year: 2014
  • DOI: 10.1155/2014/349816
  • Link: https://doi.org/10.1155/2014/349816
  • Department: Department of Electrical Power Engineering
  • Annotation:
    A process of lyophilization of paper books is modeled. The process of drying is controlled by a dielectric heating system. From the physical viewpoint, the task represents a 2D coupled problem described by two partial differential equations for the electric and temperature fields. The material parameters are supposed to be temperature-dependent functions. The continuous mathematical model is solved numerically. The methodology is illustrated with some examples whose results are discussed.

Power Network Frequency and Phasors Measurement

  • Department: Department of Electrical Power Engineering
  • Annotation:
    This paper deals with new method of phasors and frequency detection. Accurate detection of phasors and frequency are important for network power flow control using FACTS devices, precise location of network faults, network parameters detection, etc. Method in article is using statistical detection from input signal.

The hydrogen bus as a mathematical model in Matlab® - Its actual operation

  • Authors: Morte, M., Doucek, A., doc. Dr. Ing. Jan Kyncl,
  • Publication: ECS Transactions 13th International Conference on Advanced Batteries, Accumulators and Fuel Cells. New Jersey: The Electrochemical Society, 2014. p. 181-189. vol. 48. ISSN 1938-5862. ISBN 9781607683834.
  • Year: 2014
  • DOI: 10.1149/04801.0181ecst
  • Link: https://doi.org/10.1149/04801.0181ecst
  • Department: Department of Electrical Power Engineering
  • Annotation:
    The paper first outlines control strategies for all three cooperating energy sources of TriHyBus and conditions for their cooperation. For optimization of routine operation of the bus a mathematical model in MATLAB© - Simulink© has been developed at Department of Power Engineering, Faculty of Electrical Engineering, Czech Technical University in Prague. The solution of power flow consists of control strategies for fuel cell, charging of batteries and supercapacitor, and conditions for both limiting situations: lack and surplus of energy on the main bus.. In the second part of the paper the MATLAB© model is tested and verified by data obtained from the actual operation of the bus and the conclusions about differences between the model and the actual operation are made.

Verification of the Trend of MPL Variation in Fatigue by Modern Methods

  • Authors: Gajdos, L., Sperl, M., Frankl, J., Kaiser, J., Mentl, V., doc. Dr. Ing. Jan Kyncl, Lukeš, J., Kuzel, R.
  • Publication: Key Engineering Materials. 2014, 606 99-102. ISSN 1013-9826.
  • Year: 2014
  • DOI: 10.4028/www.scientific.net/KEM.606.99
  • Link: https://doi.org/10.4028/www.scientific.net/KEM.606.99
  • Department: Department of Electrical Power Engineering
  • Annotation:
    The paper presents experimental results concerning the variation of microplastic limit (MPL) during fatigue as determined by the measurement of changes in inductance L of specimens made from normalized low-C steel CSN 411375. Some indications have been obtained that MPL varies during fatigue with dislocation density. This was proved by nano-indentation, X-ray diffraction and transmision electron microscopy.

Behaviour of Ferrofluidic Liquid in Heat Pipe Affected by External Magnetic Field

  • Authors: Doubek, J., Musálek, L., doc. Dr. Ing. Jan Kyncl, Janiš, R., Kuba, J.
  • Publication: ISTET 2013. Plzeň: ZČU Plzeň, 2013. pp. I11-I12. ISBN 978-80-261-0246-5.
  • Year: 2013
  • Department: Department of Electrical Power Engineering
  • Annotation:
    The process of transporting magnetic fluid in a heat pipe is modelled. The task represents a coupled problem. The paper deals with its continuous mathematical model and its numerial solution.

Equivalent Circuit Model for a Single Phase Transformer

  • Authors: doc. Dr. Ing. Jan Kyncl, Hariram, A., Novák, Z.
  • Publication: ISTET 2013. Plzeň: ZČU Plzeň, 2013. ISBN 978-80-261-0246-5.
  • Year: 2013
  • Department: Department of Electrical Power Engineering
  • Annotation:
    The parameters of power transformers are usually determined from the results of the short-circuit test and open-circuit test, i.e. the user knows active powers, the amplitudes of currents and voltages in both situations. The aim of this paper is to present approximate formulae for “circuit theory” type of equivalent circuits of the chosen diagram. Exact formulae for parallel and serial resistances and self and mutual inductances are not available and probably cannot be obtained in a closed form.

On Measurement of Synchronous Phasors in Electrical Grids

  • Authors: doc. Dr. Ing. Jan Kyncl, Hariram, A., Novotný, M.
  • Publication: ISCAS 2013 Conference Proceedings. Piscataway: IEEE, 2013. pp. 2972-2975. ISSN 0271-4302. ISBN 978-1-4673-5760-9.
  • Year: 2013
  • DOI: 10.1109/ISCAS.2013.6572503
  • Link: https://doi.org/10.1109/ISCAS.2013.6572503
  • Department: Department of Electrical Power Engineering
  • Annotation:
    Precise estimation of frequency and phasor has become important in electrical power grids. Knowledge of phasor enables localization of faults, calculation of active and reactive power flows, determination of electrical parameters of system components (lines, transformers), etc. In this paper we present a new method for frequency and phasor assessment. Frequency assessment is done by applying statistical methods such as minimizing standard deviation of moving averages for the window length corresponding to possible frequency. Phasor assessment is done using numerical quadrature. The algorithm has been developed using Wolfram Mathematica® and implemented in development board equipped with a microcontroller.

Simulating the Power System Dynamics and Energy Consumption in a Hydrogen Bus

  • Authors: doc. Dr. Ing. Jan Kyncl, Hariram, A., Matyska, P., Najman, R.
  • Publication: 12th International Conference on Environment and Electrical Engineering. Warsaw: IEEE, 2013. p. 82-88. ISBN 978-1-4673-3060-2.
  • Year: 2013
  • DOI: 10.1109/EEEIC.2013.6549594
  • Link: https://doi.org/10.1109/EEEIC.2013.6549594
  • Department: Department of Electrical Power Engineering
  • Annotation:
    Development of hybrid vehicles is one of the key areas in the field of electric vehicle transport, hydrogen fuel cell based vehicle is one among them. The paper will examine a simplified model developed for the operation of the bus with respect to the system dynamics and energy consumption. For understanding the system and developing a model the TriHyBus was chosen. This bus is a part of the H2Bus Project that was co-financed by the ERDF (European Regional Development Fund) and the CR budget by Ministry of Transport (MDCR) from the chapter of the energy savings and use of alternative fuels in the transport sector. Finally, this paper will compare the simulated results obtained with an existing bus which runs on diesel fuel and provide a general roadmap for the hydrogen bus to be successful.

Static and Dynamic Characteristics of PPMT Electromagnet

  • Authors: Musálek, L., Doubek, J., doc. Dr. Ing. Jan Kyncl, Novák, Z., Ing. Libor Straka, Ph.D.,
  • Publication: XXXVI MIĘDZYNARODOWA KONFERENCJA Z PODSTAW ELEKTROTECHNIKI I TEORII OBWODÓW. Ustron: Instytut Elektrotechniki i Informatyki Politechniki Slaskiej, 2013. pp. 75-76. ISBN 978-83-85940-35-7.
  • Year: 2013
  • Department: Department of Electrical Power Engineering
  • Annotation:
    Static and dynamic characteristics of a PPMT actuator are modeled. The magnetic fluxes in the system are controlled by generally time varying external currents in the field coils. The movement of the right ferromagnetic part of the PPMT actuator is controlled by a mechanical spring. The paper describes the arrangement of the system, its mathematical model and the most important results.

Advanced Method of Phasors Identification in Electrical Grids

  • Department: Department of Electrical Power Engineering
  • Annotation:
    As far as synchronized phasor measurement systems have emerged as a powerful tool to improve power systems performance and reliability and e.g. fault localization possibility, the need of precise, robust and fast method of phasor identification occurred. The authors present the SW and HW implementation of their original mathematical method of frequency and phase angle assessment. Statistical methods minimizing standard deviation of moving averages of the window lengths corresponding to possible frequency values for frequency assessment and numerical quadrature for phasor are used. The algorithm has been developed and tested using Mathematica SW. Microchip implementation using C language was realized and tested in laboratory conditions.

Aproximating hysteresis curves for study of ferroresonance in iron cored transformers

  • Authors: doc. Dr. Ing. Jan Kyncl, Matyska, P., Hariram, A., Musálek, L.
  • Publication: Acta Technica CSAV. 2012, 57(3), 273-282. ISSN 0001-7043.
  • Year: 2012
  • Department: Department of Electrical Power Engineering
  • Annotation:
    The hysteresis curves produced in the iron cores of a transformer are inves- tigated. The methodology is based on full- scale laboratory measurements. A mathematical model describing their shapes is realized by the code Mathematica. Regression and method of least squares are used for a better understanding of the phenomenon.

Development of Mathematical Model for the Optimalization Use of Building

  • Authors: Matyska, P., Musálek, L., doc. Dr. Ing. Jan Kyncl, Najman, R., Zamazalová, M., Novák, Z., Hariram, A.
  • Publication: Simulace budov a techniky prostředí 2012. Praha: IBPSA-CZ, 2012. pp. 83-86. ISBN 978-80-260-3392-9.
  • Year: 2012
  • Department: Department of Electrical Power Engineering
  • Annotation:
    This paper presents a model for energy savings obtained for a house heated by solar collector and heat pump. The modeled system contains an accumulating water tank for energy storage, heat pump air-water type, solar collectors and a ground collector for preheating air at the inlet of heat pump. Heat transfer through the walls and the roof of the building is modeled as a set of parabolic partial differential equations. Real geometry of solar irradiation, cloud ratio and ambient temperature has been used for setting the boundary condition and for the evaluation of time-depended solar energy gain through three windows placed in the walls of the building. We have also incorporated real characteristics of a particular heat pump in the simulation. Wolfram-MathematicaŸ has been used for programming the simulation and also to obtain relevant weather data. Data resolution was observed to be fifteen minutes.

Influence Analysis of Mean Radiant Temperature of Sky on Power Flows and Temperatures of Outdoor Electric Power Appliances

  • Authors: Musálek, L., Melichar, J., doc. Dr. Ing. Jan Kyncl,
  • Publication: Proceedings of the 13th International Scientific Conference EPE 2012. Brno: VUT v Brně, Fakulta elektrotechniky a komunikačních technologií, 2012. pp. 837-840. ISBN 978-80-214-4514-7.
  • Year: 2012
  • Department: Department of Electrical Power Engineering
  • Annotation:
    Two parameters are essential for temperature calculations of heated objects: temperature of ambient air and mean radiant temperature of surrounding surfaces. In the case of solid surfaces the mean radiant temperature can be assessed as the weighted average of fourth powers of the absolute temperatures. Configuration factors are used as the weights. Outdoor appliances are affected by air temperature and the radiations of ground and sky. The paper deals with the assessment of the mean radiant temperature for two basic cases. An infinite cylinder with the axis parallel to ground serves as the model for ampacity phenomenon. The finite plane serves as the model of photovoltaic panels. Theoretical analysis and experimental results are presented in the paper and the results are discussed.

The Use of Regression Methods for Measurement and Diagnostics in Electrical Power Engineering

  • Department: Department of Electrical Power Engineering
  • Annotation:
    The paper presents the principles and the utilization of regression methods for measurement using electrical quantities samples. Direct electrical devices parameters measurement in operation can be sometimes a hard or even impossible task. The presumption of electrical circuits linearity and harmonic signal component orthogonality allows us to determine the circuit parameters using the sampled data and the least-square regression method. Examples of the developed method utilization are given in the paper. The first example is devoted to harmonic filters equivalent circuit data assessment. The second one deals with the measurement of active losses in highly reactive devices e.g. arc-suppression coils.

Education of Digital and Analog Circuits Supported by Computer Algebra System

  • Authors: doc. Dr. Ing. Jan Kyncl, Novotný, M.
  • Publication: ISCAS 2011 Conference Proceedings. Piscataway: IEEE, 2011. pp. 341-344. ISSN 0271-4302. ISBN 978-1-4244-9472-9.
  • Year: 2011
  • DOI: 10.1109/ISCAS.2011.5937572
  • Link: https://doi.org/10.1109/ISCAS.2011.5937572
  • Department: Department of Electrical Power Engineering
  • Annotation:
    We describe our approach in education of the course Digital and Analog Circuits, which belongs to curricula of the Informatics study program. For analysis of analog and simple digital circuits we use computer algebra system Mathematica, which minimizes the amount of routine, handy calculations. This fact enables focusing on the problem and solving more examples, which in turn provides better comprehension of the topic. As Mathematica is later used in subsequent courses, its knowledge is utilized in these courses. Last, but not least, Mathematica provides several programming paradigms, which can be easy demonstrated to students of Informatics study program.

Effective Method of Synchronous Phasor Detection

  • Department: Department of Electrical Power Engineering
  • Annotation:
    Large power system disturbances and their consequences represent a challenging problem for power system operation, its security and reliability. This fact has reinforced interest in the new generation of monitoring systems. Synchronized Phasor Measurement System has emerged as a powerful tool to improve power systems performance and reliability and e.g. fault localization possibility. Data measured by PMU (Phasor measurement unit) are source of progressive research and can be used for network state modeling including lot of variable parameters. The paper describes a PMU hardware solution developed at CTU in Prague and mainly an effective method of detecting synchronous phasors of voltages and currents for differently disturbed electrical quantities time behaviours.

Higher Harmonics Filters Parameters Diagnostics in Industrial Applications

  • Department: Department of Electrical Power Engineering
  • Annotation:
    The paper analyses the solution possibilities of tuning, diagnostics and incorrect function discovering for higher harmonics filters in industrial applications. The paper principle topic is the possibility analysis of filters RLC elements parameters calculation during standard device operation. The method verification is carried out with a mathematical model as well as with a measurement in terms of a case study. The case study results from filters voltage and current measurement in a tube rolling mill in a metallurgical company.

Modern Tools for Electron Tube Power Source Design

  • Department: Department of Electrical Power Engineering
  • Annotation:
    The paper deals with a mathematical model of electron tubes which is feasible for modern numerical solvers of differential equations. It is described how to measure parameters for the model and how to use these parameters in modeling circuits.

Online Powerline Ampacity Measurement

  • Authors: Frolec, J., doc. Dr. Ing. Jan Kyncl, Tlustý, J.
  • Publication: Proceedings of the 12th International Scientific Conference Electric Power Engineering 2011. Ostrava: Vysoká škola báňská - Technická univerzita Ostrava, 2011. pp. 1-3. ISBN 978-80-248-2393-5.
  • Year: 2011
  • Department: Department of Electrical Power Engineering
  • Annotation:
    As the demand for electricity increases, there is a need to increase electricity generation, transmission, and distribution capacities to match the demand. While the location and construction of generation facility is relatively easy, it is becoming increasingly difficult to construct new lines. As a result, electric power authorities everywhere are searching for new ways to maximize the current-carrying capacity of power lines. The paper is divided into two parts: The first part introduces a general review of the parameters that have influence in the determination of the current-carrying capacity, to find a mathematical model to measure the ampacity of the overhead lines and the conductor temperature and analyze all the sensitivities with the main variables. Secondly, an electronic measurement device is proposed and some technical specifications for conductor ampacity and temperature data transfer and evaluation are introduced.

Overhead Lines Ampacity

  • Authors: doc. Dr. Ing. Jan Kyncl,
  • Publication: Monitorování, řízení a chránění elektrizačních soustav. Praha: Czech Technical University in Prague, 2011. p. 105-125. ISBN 978-80-01-04940-2.
  • Year: 2011
  • Department: Department of Electrical Power Engineering
  • Annotation:
    The chapter explains the thermal models of overhead lines for steady, dynamic and transient states. The models are composed of heat powers balances and conductor material behaviour for different situations. There is presented a study of the main climatic and material quantities influence on the conductor temperature and current carrying capacity. Also some legislative and practical connections are presented.

Combined cooling of photovoltaic panels

  • Department: Department of Electrical Power Engineering
  • Annotation:
    The paper deals with combined cooling of photovoltaic panels. The analyzed technologies are intended for use especially in areas with extreme climatic conditions.

Cooling Options Analysing of Photovoltaic Panels

  • Department: Department of Electrical Power Engineering
  • Annotation:
    It's known that the photovoltaic panel is producing less energy with higher temperature of a panel. The presented results show how we can produce more energy from photovoltaic panels in case of cooling these panels. We look on the panel in elektrothermal analogy and we present the equations solving problem. In paper are discussed possibilities of cooling options like a spontaneous convection or forced convection.

Experimental determination of total heat transfer coefficient between the control gear and lamps interior space

  • Authors: Ing. Miroslav Müller, Ph.D., doc. Dr. Ing. Jan Kyncl,
  • Publication: Proceedings of the 11th International Scientific Conference Electric Power Engineering 2010. Brno: Brno University of Technology, 2010. p. 757-759. ISBN 978-80-214-4094-4.
  • Year: 2010
  • Department: Department of Electrical Power Engineering
  • Annotation:
    A new experimental procedure for heat transfer coefficient assessment. The principle of the method is based on nonlinear regression applied on measured temperature and time data during unsteady heating process. A simple formula for total heat transfer coefficient has been proposed.

The usage of synchrophasor for optimised fault localization method

  • Department: Department of Electrical Power Engineering
  • Annotation:
    Common methods for fault localization require for proper function a lot of specialized instruments. These special instruments should be permanently installed or moved to required distribution area. New fault location method needs only a few synchronously measured voltage and current phasors in the fault time for its proper function. The OHL parameters are used for more accurate calculation. The fault is located very quickly using relatively small amount of explained input data and a very special methods. This method can be performed on-line without the line to be switched off. The solving algorithm is based on matrix multiplication with discrete optimization. This is due to the fact that each line segment can be described as the matrix with OHL parameters. During the calculation the immediate fault rate is traced. The evaluation time strongly depends on the computer calculation capabilities and required accuracy.

H Matrix Fault Location Method- Study of the Phasor Measurement Error Influence

  • Authors: Novotný, T., doc. Dr. Ing. Jan Kyncl,
  • Publication: Proceedings of the 5th International Scientific Symposium on Electric Power Engineering ELEKTROENERGETIKA 2009. Košice: TU Košice, FEI, 2009. pp. 314-316. ISBN 978-80-553-0401-4.
  • Year: 2009
  • Department: Department of Electrical Power Engineering
  • Annotation:
    The paper shows a new method how to find the fault admittance in the method of fault location using H-matrices by a finite algorithm. The use of the method has been shown on an example of fault location using input phasors as exact values with added noise of Gaussian probability distribution.

Thermal models of power transformers and ballasts for middle and long time load

  • Authors: Novotný, T., doc. Dr. Ing. Jan Kyncl,
  • Publication: Electric Power Engineering 2009. Ostrava: VŠB, 2009. p. 337-342. ISBN 978-80-248-1947-1.
  • Year: 2009
  • Department: Department of Electrical Power Engineering
  • Annotation:
    Complete FEM-based models are very suitable tool for detailed oil transformer or reactor design. For quick decision making during design process and studying transient phenomena a new more flexible model has been proposed.

Design of fast freezing of books by liquid nitrogen

  • Authors: Najman, R., doc. Dr. Ing. Jan Kyncl, Kašpar, J., Vyhlídko, T.
  • Publication: Sborník konference ELEN 2008. Praha: ČVUT FEL, Katedra elektroenergetiky, 2008. pp. 1-8. ISBN 978-80-254-2293-9.
  • Year: 2008
  • Department: Department of Electrical Power Engineering
  • Annotation:
    I would like to show example, why to use fast freezing of books.In 2002 Prague was cursed with flood, which cursed city library in Pratur and its sites. For example: central library(more than 5m of water in basement, library in Holešovice Pratur, there is department of precious books in basement, which was flooded up to 1,5m. It was depreciace about 80-90% of books fond and Karlins site was totally destroyed. This culture and scientific organisation, which collects, makes accesible and saves dokument, which are useful source of informations, we chose because it is very interesting subject and demages, which were made by flood, they were very large. It can be said, the loss of precious books (bible, Vyšehradský kodex,…) was in the shadow of others events. It was destroyed 46000 books and 20000 seriously demaged books.The big loss was demaging of Prague bible from 1488 (inkunábule) and around 100 books from 16.-17. century.

Finding dependency between magnetic flux and current in time domain from measured dependency between effective value of magnetization flux and feeding magnetic amplitude

  • Authors: Najman, R., doc. Dr. Ing. Jan Kyncl, Kašpar, J., Vyhlídko, T.
  • Publication: Sborník konference ELEN 2008. Praha: ČVUT FEL, Katedra elektroenergetiky, 2008. pp. 1-6. ISBN 978-80-254-2293-9.
  • Year: 2008
  • Department: Department of Electrical Power Engineering
  • Annotation:
    This thesis deals with substitution circuit diagrams of power transformers, is focused on verification of the procedure for finding the dependency between Magnetic Flux in time and the dependency between effective values of current and voltage. The problem has been theoretically analyzed and also practically verified.

Some Remarks on Electric Heating System Design

  • Authors: doc. Dr. Ing. Jan Kyncl,
  • Publication: Proceedings of the 9th International Scientific Conference Electric Power Engineering 2008. Brno: Brno University of Technology, 2008. pp. 393-396. ISBN 978-80-214-3650-3.
  • Year: 2008
  • Department: Department of Electrical Power Engineering
  • Annotation:
    However modern computer algebra systems allow us to evaluate technical properties of building heating systems properly, most of calculations have not changed. The paper deals with some examples of this fact.

The Identification of H-matrix Describing HV Lines from Measured Data

  • Authors: Novotný, T., doc. Dr. Ing. Jan Kyncl,
  • Publication: Proceedings of the 9th International Scientific Conference Electric Power Engineering 2008. Brno: Brno University of Technology, 2008. pp. 201-203. ISBN 978-80-214-3650-3.
  • Year: 2008
  • Department: Department of Electrical Power Engineering
  • Annotation:
    This paper deals with problem of the identification of H-matrix describing HV lines from measured data. Voltages and currents have been measured at both ends of HV line for calculation of H-matrix from them.

Combined Electric Heating Systems

  • Authors: Boldiš, T., doc. Dr. Ing. Jan Kyncl,
  • Publication: Topenářství, instalace. 2007, 2007(227), 46-49. ISSN 1211-0906.
  • Year: 2007
  • Department: Department of Electrical Power Engineering
  • Annotation:
    Authors describe outcomes of the experimental measurement in climatic chamber. The combined electric heating system was build from basic heating system and additional system-electric floor heating and convector.

Experience with differential model of hysteresis loop for modeling of induction heating

  • Authors: doc. Dr. Ing. Jan Kyncl, Kubín, P.
  • Publication: Induction, dielectric, Conduction and Electromagnetic Processing. Padova: Servici Grafici Editoriali, 2007. pp. 553-558. ISBN 88-89884-07-X.
  • Year: 2007
  • Department: Department of Electrical Power Engineering
  • Annotation:
    The paper deals with the induction heating modelling of materials that significantly exhibit magnetic hysteresis. Proposed mathematical solution is implemented for variables of electromagnetic field generally varying with time, considering the first order differential hysteresis loop model. Parameters of the model are obtained from the measurement of ferromagnetic materials by non-linear regression using Levenberg-Marquardt method. The main emphasis is laid on the verification of classical analytical and numerical methods - the nonlinearity of the system makes the description of the system by phasors impossible - and their specification comparing the designed mathematical simulation. However the study with simplified geometries is considered due to the extreme calculation time, the expansion for the complex and practical application types is feasible and proposed.

Factors influencing shape of load diagram of 110/22 kV transformers and accuracy in computing annual losses

  • Authors: doc. Dr. Ing. Jan Kyncl, Mgaya, E., doc. Ing. Zdeněk Müller, Ph.D., Sýkora, T., Tlustý, J., Willmann, B.
  • Publication: IVth International Scientific Symposium ELEKTROENERGETIKA 2007 - Proceedings. Košice: Technická univerzita v Košiciach, 2007. p. 247-252. ISBN 978-80-553-0400-7.
  • Year: 2007
  • Department: Department of Electrical Power Engineering
  • Annotation:
    The paper presents main differences in load diagram shape according to losses computation. Main differences in losses computed using various methods are explained. Case study is also part of the paper.

Fault Location in HV Systems

  • Authors: Tlustý, J., Doležal, J., doc. Dr. Ing. Jan Kyncl, Ing. Radek Hanuš, Ph.D.,
  • Publication: Proceedings of the 8th International Scientific Conference Electric Power Engineering 2007. Ostrava: VŠB - Technická univerzita Ostrava, 2007. pp. 568-577. ISBN 978-80-248-1391-2.
  • Year: 2007
  • Department: Department of Electrical Power Engineering
  • Annotation:
    Series connection of n-port circuits can be easily solved using hybrid parameters of the circuits and corresponding H-matrices. Homogenous transmission lines can be then read as series connection of chosen number of parts of the same H-matrix description. If a fault (or illegal current consumption) occurs, the resulting H- matrix is the product of n-th power of H-matrix describing a regular section, H matrix describing the fault and m-th power of H-matrix describing a regular section. Because it is possible to know the phasors of the currents and voltages at the ends of the line and the fact that matrix product is not commutative, developed optimization methods allow to determine the position and character of the fault.

Methods of automatic recognition of transients

  • Authors: Kopejtko, P., doc. Dr. Ing. Jan Kyncl, Kubín, P.
  • Publication: Proceedings of the 8th International Scientific Conference Electric Power Engineering 2007. Ostrava: VŠB - Technická univerzita Ostrava, 2007. pp. 458-468. ISBN 978-80-248-1391-2.
  • Year: 2007
  • Department: Department of Electrical Power Engineering
  • Annotation:
    A large amount of transient's records in the electric network systems are nowadays available. Time records of these phenomena are acquired with special equipment - fault recorders. These equipments are triggered not only from protection devices, but also set to be triggered from circuit breakers operations or overvoltages. Obtained records are collected and automatically analyzed. This contribution describes several possible methods for the automatic analysis of these records. Main emphasis is laid on the method based on the calculation of real network parameters changes during the transient. This method exploits the differential equations knowledge determined from the electric system elements. The second approach is based on the tracking of the time intervals of transient corresponding with the solution of the mentioned differential equation.

Nonlinear time domain transformer model assessment

  • Department: Department of Electrical Power Engineering
  • Annotation:
    The dependence of current effective values on applied harmonic voltage of unloaded transformer cannot be used for time domain analysis. Because of the unavailability of the time domain measured values authors has developed method to obtain the nonlinear transformer model with hysteresis with the reasonable accuracy. The paper describes step by step the assessment of time domain characteristics based on measured effective values.

The Influence of Measurement Accuracy on Fault Location Method

  • Authors: Novotný, T., Kubín, P., doc. Dr. Ing. Jan Kyncl,
  • Publication: IVth International Scientific Symposium ELEKTROENERGETIKA 2007 - Proceedings. Košice: Technická univerzita v Košiciach, 2007. ISBN 978-80-553-0400-7.
  • Year: 2007
  • Department: Department of Electrical Power Engineering
  • Annotation:
    Nowadays methods enabled to determine voltages and currents at both ends of HV lines not only as effective values, but as phasors and this fact lead to better method of fault location based on H-matrices and advanced methods of numerical minimizing of functions. The paper presents the study of the influents of noise level and type, numerical filtering of signals and phasor fitting methods on the accuracy of fault location.

Combined Electrical Heating Systems

  • Authors: Boldiš, T., doc. Dr. Ing. Jan Kyncl,
  • Publication: Zborník přednášok 14. medzinárodná konferencia VYKUROVANE 2006. Bratislava: Slovenská spoločnost pro techniku prostredia, 2006. pp. 330-337. ISBN 80-89216-06-4.
  • Year: 2006

Determination of Differential Model of Hysteresis Loop

  • Authors: Kubín, P., doc. Dr. Ing. Jan Kyncl,
  • Publication: ELEN 2006 (Elektroenergetika). Praha: České vysoké učení technické v Praze, 2006. pp. 1-4. ISBN 80-239-7650-8.
  • Year: 2006
  • Department: Department of Electrical Power Engineering
  • Annotation:
    Several methods of differential hysteretis model from measured signals waveforms have been already described in the literature. The paper indicates procedure how to obtain -approximate- differential model of hysteresis loop from the given mean line and loop area - corresponding to the hysteresis losses of the material.

History of Transport of the Territory of Czech republik

  • Authors: Tuzar, A., Uhříček, V., doc. Dr. Ing. Jan Kyncl, Ryba, J.
  • Publication: Historie dopravy na území České republiky. Pardubice: Institut Jana Pernera, 2006. p. 17-106. ISBN 80-903184-9-5.
  • Year: 2006

Matrix phasor evaluation for fault location using H matrix

  • Authors: Novotný, T., doc. Dr. Ing. Jan Kyncl,
  • Publication: Proceedings of the 7th International Scientific Conference Electric Power Engineering 2006. Brno: Brno University of Technology, 2006. p. 213-215. ISBN 978-80-214-3180-5.
  • Year: 2006
  • Department: Department of Electrical Power Engineering
  • Annotation:
    Differential tools for fault location on HV lines are relatively slow, the use of phasor values seems to be in place even nowadays. Fast both ordinary and advanced methods for fault location use phasor values. A brief concept of proposed fault location method is given in the paper together with the simulation of the fault voltages and currents in time domain and results of phasor values extraction from them.

Modeling of Induction Heating of Ferromagnetic Materials

  • Authors: Kubín, P., doc. Dr. Ing. Jan Kyncl,
  • Publication: ELEN 2006 (Elektroenergetika). Praha: České vysoké učení technické v Praze, 2006. pp. 1-4. ISBN 80-239-7650-8.
  • Year: 2006
  • Department: Department of Electrical Power Engineering
  • Annotation:
    Ferromagnetics represent one of the most applied types of materials. To achieve their required thermal fields is the induction heating often the only way. Modeling of induction heating of ferromagnetic materials considering hysteresis is not included in available SW. This paper presents the differential model of hysteresis in the induction heating model.

A New Method of Fault Location Using H-Parameters Circuit Description

  • Authors: Ing. Radek Hanuš, Ph.D., doc. Dr. Ing. Jan Kyncl, Kubín, P., Tlustý, J.
  • Publication: Sborník z 3. vědeckého sympózia elektroenergetika 2005. Košice: Technická univerzita v Košiciach, 2005. pp. 1-27. ISBN 9788055303994.
  • Year: 2005
  • Department: Department of Electrical Power Engineering
  • Annotation:
    Series connection of n-port circuits can be easily solved using hybrid parameters of the circuits and corresponding H-matrices. Homogenous transmission lines can be then read as serious connection of chosen number of parts of the same H-matrix description. If a fault (or illegal current consumption) occurs, the resulting H- matrix is the product of n-th power of H-matrix describing a regular section, H matrix describing the fault and m-th power of H-matrix describing a regular section. Because it is possible to know the phasors of the currents and voltages at the ends of the line and the fact that matrix product is not commutative, developed optimization methods allow to determine the position and character of the fault.

Advanced Method of Fault Location Using Synchronized Voltage and Current Phasors

  • Authors: Tlustý, J., Doležal, J., doc. Dr. Ing. Jan Kyncl, Ing. Radek Hanuš, Ph.D., Kubín, P., Švec, J., Mgaya, E.
  • Publication: 1st International Electrical Power Engineering Scientific Conference Proceedings. St. Peterburg: International Engineering Center, 2005. pp. 1-15.
  • Year: 2005
  • Department: Department of Electrical Power Engineering
  • Annotation:
    Series connection of n-port circuits can be easily solved using hybrid parameters of the circuits and corresponding H-matrices. Homogenous transmission lines can be then read as series connection of chosen number of parts of the same H-matrix description. If a fault (or illegal current consumption) occurs, the resulting H-matrix is the product of n-th power of H-matrix describing a regular section, H-matrix describing the fault and m-th power of H-matrix describing a regular section. Because it is possible to know the phasors of the currents and voltages at the ends of the line and the fact that matrix product is not commutative, developed optimization methods allow to determine the position and character of the fault.

Alternative Energy Resources Testing Intelligent Load

  • Authors: Bannert, P., doc. Dr. Ing. Jan Kyncl,
  • Publication: Sborník z 3. vědeckého sympózia elektroenergetika 2005. Košice: Technická univerzita v Košiciach, 2005. pp. 1-15. ISBN 9788055303994.
  • Year: 2005
  • Department: Department of Electrical Power Engineering
  • Annotation:
    The intelligent power load will be a part of a hydrogen fuel cell operational characteristics testing set that has been installed at the FEL CVUT laboratory in Prague. This contribution deals with an intelligent load the parameters of which are being controlled from a PC through a USB port (or RS232, LPT). The intelligent load is designed as a single-phase reference load with an adjustable real power P and the power factor cos phi. The intelligent load basic circuit is an NC controlled parallel R - TCR (Resistor - Thyristor Controlled Reactor) circuit. The intelligent power load may also be used for other laboratory purposes. In this contribution I endeavor to point out the problems that one can meet when designing an intelligent load of the R-TCR type. The load presented here is being at the phase of calculations and design of the control algorithms. Its physical realization and testing phase comes next, within the oncoming weeks.

Ferroresonant Overvoltages in the Power Transmission Systems

  • Authors: Tlustý, J., doc. Dr. Ing. Jan Kyncl, Kubín, P., Švec, J., prof. Ing. Viktor Valouch, CSc.,
  • Publication: Proceedings of the XIVth International Symposium on High Voltage Engineering. Beijing: Tsinghua University Press/Springer, 2005. pp. 1-6. ISBN 7-302-01581-3.
  • Year: 2005
  • Department: Department of Electrical Power Engineering
  • Annotation:
    Mathematical methods for nonlinear circuits' solutions are mentioned in the paper. The authors concentrated on ferroresonant circuits solutions. A particular ferroresonant 3-phase circuit is solved in the case study; the circuit analysis is performed by means of the software Mathematica and SW EASYNUM

Importace of Fuel Cells in Future Power Systems

  • Authors: doc. Dr. Ing. Jan Kyncl, Kubín, P., Taussig, T.
  • Publication: Energetika. 2005, 55(7), 219-223. ISSN 0375-8842.
  • Year: 2005
  • Department: Department of Electrical Power Engineering
  • Annotation:
    Consumption of electric power is growing and it is crucial to ensure the sufficient amount for future generations as well. Present examined energy sources should gradually substitute classical fossil fuels. The substitution pace should correspond to the lowering of their accessibility and estimated tighten of the requirements on the environmental protection. One of new fuel should be hydrogen. Appropriate power generation systems are fuel cells.

Induction Heating Modeling of Materials with Hysteresis

  • Authors: Kubín, P., doc. Dr. Ing. Jan Kyncl,
  • Publication: RUPEC 2005. Praha: České vysoké učení technické v Praze, 2005. pp. 1-11. ISBN 80-239-5439-3.
  • Year: 2005
  • Department: Department of Electrical Power Engineering
  • Annotation:
    This paper focuses on the induction heating modeling of materials that exhibit magnetic hysteresis. Proposed mathematical solution is implemented for general time varying electromagnetic field variables, considering the first order differential hysteresis loop model. The main emphasis is laid on the verification of classical analytical and numerical methods - the nonlinearity of the system makes the description of the system by phasors impossible - and their specification comparing the designed mathematical simulation. However the study with simplified geometries was considered due to the extreme calculation time, the expansion for the complex and practical application types is feasible. There are proposed the coefficients describing the link between linear and hysteresis materials.

Inteligent Power Load

  • Authors: Bannert, P., doc. Dr. Ing. Jan Kyncl,
  • Publication: Electric Power Engineering 2005. Ostrava: VŠB-TUO, 2005. p. 1-12. ISBN 978-80-248-0842-0.
  • Year: 2005
  • Department: Department of Electrical Power Engineering
  • Annotation:
    The intelligent power load will be a part of a hydrogen fuel cell operational characteristics testing set that has been installed at the FEL CVUT laboratory in Prague. The hydrogen cell exploitation in the power industry pilot project, put into effect by the ENVIROS company, was one of those supported within the Energy Saving and Recoverable Energy Resources National Program in 2004. he load presented here is being at the phase of calculations and design of the control algorithms. Its physical realization and testing phase comes next, within the oncoming weeks.

Mathematic Model of Current Measurement Transformer

  • Department: Department of Electrical Power Engineering
  • Annotation:
    This paper describes mathematic model of current measurement transformer (CMT) for fast response protection device. The model takes into account real magnetic core properties, that means nonlinear function B=f(H). Undistorted transfer through CMT is very important for working of response protection device. We analyzed output current of CMT dependent on different value of load. Than we inquire into current silence.

Optimization Techniques in Electroheat Devices Design

  • Authors: Krumphanzl, J., doc. Dr. Ing. Jan Kyncl, Kubín, P.
  • Publication: Sborník z 3. vědeckého sympózia elektroenergetika 2005. Košice: Technická univerzita v Košiciach, 2005. pp. 1-13. ISBN 9788055303994.
  • Year: 2005
  • Department: Department of Electrical Power Engineering
  • Annotation:
    The paper deals with the design of selected electroheat device as an optimization problem that in fact every creative design invention is. The design process represents the solving of some type of indirect task, exactly unsolvable and in addition the exact solution of the direct problem is unsolvable as well and numerical approximation seems to be -instead of designer's transcendental anticipation- the only way. Authors show the principles of the fitness function creation and finding optimal and sub-optimal parameters (for example the geometry, temperatures, air velocity) using genetic algorithms based on optimization techniques. Appliances examples of glass furnaces, paper drying and solar collector are presented.

The Model of Non-Linear Three-Phase Transformer

  • Department: Department of Electrical Power Engineering
  • Annotation:
    Three-phase transformer is a very expensive and important part of the electrical transmission and distribution systems and in many cases the properties of the transformer are essential for phenomena that can occur, i.e. short connection current form, overvoltages, ferroresonant processes etc. Classical methods fail if the non-linearity and hysteresis cannot be neglected. The paper deals with the time-domain mathematical model of the three-limb construction nonlinear transformer and its implementation in the POWER SYSTEM BLOCKSETŽ.

The Model of Non-Linear Three-Phase Transformer with or without Hysteresis

  • Department: Department of Electrical Power Engineering
  • Annotation:
    Three-phase transformer is a very expensive and important part of the electrical transmission and distribution systems and in many cases the properties of the transformer are essential for phenomena that can occur, i.e. short connection current form, overvoltages, ferroresonant processes etc. Classical methods fail if the non-linearity and hysteresis cannot be neglected. The paper deals with the time-domain mathematical model of the three-limb construction nonlinear transformer and its implementation in the POWER SYSTEM BLOCKSETŽ.

Time Domain Analysis of Hysteresis Materials in Induction Heating Appliances

  • Authors: Kubín, P., doc. Dr. Ing. Jan Kyncl,
  • Publication: Sborník z 3. vědeckého sympózia elektroenergetika 2005. Košice: Technická univerzita v Košiciach, 2005. pp. 1-11. ISBN 9788055303994.
  • Year: 2005
  • Department: Department of Electrical Power Engineering
  • Annotation:
    This paper deals with the induction heating modeling of materials that significantly exhibit magnetic hysteresis. Proposed mathematical solution is implemented for general time varying electromagnetic field variables, considering the first order differential hysteresis loop model. The main emphasis is laid on the verification of classical analytical and numerical methods - the nonlinearity of the system makes the description of the system by phasors impossible - and their specification comparing the designed mathematical simulation. However the study with simplified geometries was considered due to the extreme calculation demandingness, the expansion for the complex and practical application types is feasible and proposed.

Advanced Model of Voltage Instrument Transformer in Distribution Network

Application of Coumputer Algebra Systems

  • Authors: Andrlík, Z., doc. Dr. Ing. Jan Kyncl, Prskavec, L.
  • Publication: Aplimat 2004. Bratislava: STU v Bratislave, 2004. pp. 211-215. ISBN 80-227-1995-1.
  • Year: 2004

Computer Algebra Systems in Electrical Power Engineering's Subjects

  • Authors: Prskavec, L., doc. Dr. Ing. Jan Kyncl, Ing. Jan Špetlík, Ph.D., Andrlík, Z.
  • Publication: Proceedings of the 9th International Conference on Optimization of Electrical and Electronic Equipments. Brasov: The Transilvania University of Brasov, Faculty of Electrical Engineering, 2004. pp. 181-186. ISBN 978-973-635-286-7.
  • Year: 2004

Energy Savings at Historical Building Heating

  • Authors: doc. Dr. Ing. Jan Kyncl, Bednář, P.
  • Publication: ELEN 2004. Praha: České vysoké učení technické v Praze, Fakulta elektrotechnická, 2004. ISBN 80-239-3565-8.
  • Year: 2004

Ferroresonant Overvoltages in the Electrical Power Systems

  • Authors: doc. Dr. Ing. Jan Kyncl, Tlustý, J., Švec, J.
  • Publication: International Conference: Overvoltages and Electrical Equipment Reliability. St. Peterburg: PEI, 2004. pp. 328-336.
  • Year: 2004

Higher Harmonics Filtration in Light Circuits

  • Authors: Doležal, J., doc. Dr. Ing. Jan Kyncl, Švec, J., Tlustý, J.
  • Publication: Sborník přednášek z konference "Kurz osvětlovací techniky XXIII". Ostrava: Česká společnost pro osvětlování, 2004. pp. 200-204. ISBN 80-248-0659-2.
  • Year: 2004

Mathematical model of bulb flicker

  • Authors: Bannert, P., Habel, J., doc. Dr. Ing. Jan Kyncl, Tlustý, J.
  • Publication: ELEN 2004. Praha: České vysoké učení technické v Praze, Fakulta elektrotechnická, 2004. ISBN 80-239-3565-8.
  • Year: 2004

New Concept of Transformer Modelling in Operation Conditions

Non-conventional Method of Electric Arc Furnace Protection and Failure Identification

Selected Aspects of Wind Power Plant Operations

  • Authors: doc. Dr. Ing. Jan Kyncl, Lyčka, Š., Sýkora, T., Tlustý, J.
  • Publication: Energetika. 2004, 54(12), 399-405. ISSN 0375-8842.
  • Year: 2004

Technical Aspects of Dispersed Generation Sources in MV System

The Utilization of Optimizing Methods for Solving Unbalanced States in the Electrical Power Engineering

  • Authors: doc. Dr. Ing. Jan Kyncl, Švec, J., Tlustý, J.
  • Publication: XXV. sešit Katedry teoretické elektrotechniky. Ostrava: VŠB, 2004. pp. 85-90. ISBN 80-248-0603-7.
  • Year: 2004

Alternative Modelling of Nonlinear Heating

An Alternative Approach to Mathematical Modelling of High Frequency Non-linear Heating

  • Authors: doc. Dr. Ing. Jan Kyncl, Tlustý, J.
  • Publication: SCI 2003 The 7th World Multiconference on Systemics, Cybernetics na Informatics. Orlando: IIIS - International Institute of Informatics and Systemics, 2003. ISBN 980-6560-01-9.
  • Year: 2003

Implementation of Renewable Electrical Energy Generation in an Urban Distribution

Mathematical Simulation of Ferroresonance Phenomena in Power Engineering

  • Authors: Tlustý, J., doc. Dr. Ing. Jan Kyncl,
  • Publication: Electric Power Engineering 2003. Ostrava: VŠB, 2003. pp. 89-90. ISBN 80-248-0225-2.
  • Year: 2003

Overhead Line Ampacity

  • Authors: Tlustý, J., doc. Dr. Ing. Jan Kyncl,
  • Publication: Energetika. 2003, 53(2), 61-63. ISSN 0375-8842.
  • Year: 2003

The Design of Channel Furnace Power Scale

  • Authors: doc. Dr. Ing. Jan Kyncl,
  • Publication: Praha: ČVUT FEL, Katedra elektroenergetiky, 2003. ISBN 80-01-02783-X.
  • Year: 2003

Using Computer Algebra Systems in Distance Teaching

  • Authors: Prskavec, L., doc. Dr. Ing. Jan Kyncl,
  • Publication: ZKWE'2003. Poznan: Wydawnictvo Institutu Elektrotechniki Przemyslovej Politechniki Poznanskej, 2003. pp. 633-636. ISBN 83-912306-4-3.
  • Year: 2003

A New Access to Ferroresonance Phenomena Modelling

  • Authors: Tlustý, J., doc. Dr. Ing. Jan Kyncl,
  • Publication: Acta Technica CSAV. 2002, 47(5), 317-331. ISSN 0001-7043.
  • Year: 2002

Do the Walls Have to Freeze?

Do Walls Have to Freeze?

Electrical Energy in the Protection of Historical Buildings

  • Authors: Němeček, M., doc. Dr. Ing. Jan Kyncl,
  • Publication: Elektroenergetika 2002. Praha: České vysoké učení technické v Praze, 2002. pp. 195-198. ISBN 80-01-02614-0.
  • Year: 2002

Electroheat Protection of Flooded Buildings

  • Authors: doc. Dr. Ing. Jan Kyncl, Šváb, M.
  • Publication: Energetika. 2002, 52(12), 314-315. ISSN 0375-8842.
  • Year: 2002

Electromagnetic Fields Generated by Overhead Lines and their Enviromental Impacts

Energy Savings by Channel Furnace Modern Design

Energy Savings Using Modern Heating Methodology

  • Authors: doc. Dr. Ing. Jan Kyncl, Bednář, P.
  • Publication: Elektroenergetika 2002. Praha: České vysoké učení technické v Praze, 2002. pp. 71-74. ISBN 80-01-02614-0.
  • Year: 2002

FEMLAB - Simulation of Induction Heating

Optimalization of Interier's Climate

  • Authors: Tůma, J., Habel, J., doc. Dr. Ing. Jan Kyncl, Hašpica, R., Krumphanzl, J.
  • Publication: Journal of Electrical Engineering. 2002, 53(4), A. ISSN 1335-3632.
  • Year: 2002

The Use of Electrical Energy for Ligniperdous Insect Destroy

  • Authors: Matička, O., doc. Dr. Ing. Jan Kyncl,
  • Publication: Elektroenergetika 2002. Praha: České vysoké učení technické v Praze, 2002. pp. 199-202. ISBN 80-01-02614-0.
  • Year: 2002

Weather-Dependent Powerline Ampacity and Extraordinary State of the Power Systems

  • Authors: doc. Dr. Ing. Jan Kyncl, Tlustý, J.
  • Publication: Elektroenergetika 2002. Praha: Czech Technical University in Prague, 2002. p. 187-190. ISBN 80-01-02614-0.
  • Year: 2002

Corrosion of Metallic Electrodes in Silicate Melts

  • Authors: Kubín, P., doc. Dr. Ing. Jan Kyncl, Němeček, M.
  • Publication: International Seminar on Heating by Internal Sources. Padova: Universita degli Studi di Padova, 2001. pp. 239-245. ISBN 88-86281-64-1.
  • Year: 2001

Electromagnetic Fields Produced by Power Overhead Lines and Their Environmental Aspects

Genetic Argorithms Applied on Channel Furnaces Design

  • Authors: Krumphanzl, J., doc. Dr. Ing. Jan Kyncl, Kubín, P.
  • Publication: Budoucnost elektroenergetiky v regionu Jižní Morava. Brno: VUT v Brně, FEI, 2001. pp. 58-63. ISBN 80-214-2015-4.
  • Year: 2001

Global Optimization Methods Applied on Channel Furnaces Design

  • Authors: Krumphanzl, J., Kubín, P., doc. Dr. Ing. Jan Kyncl,
  • Publication: International Seminar on Heating by Internal Sources. Padova: Universita degli Studi di Padova, 2001. pp. 651-656. ISBN 88-86281-64-1.
  • Year: 2001

Interiors Climate Optimization

  • Authors: Tůma, J., Habel, J., doc. Dr. Ing. Jan Kyncl, Krumphanzl, J., Hašpica, R.
  • Publication: Elektroenergetika 2001. Košice: TU Košice, FEI, 2001. pp. 149-154. ISBN 80-88922-34-8.
  • Year: 2001

Methodology of Solving Multiple Reflections

  • Authors: Hašpica, R., Habel, J., doc. Dr. Ing. Jan Kyncl,
  • Publication: Kurz osvětlovací techniky XIX. Ostrava: VŠB-TUO, 2001. pp. 8-15.
  • Year: 2001

Multiple Reflection Solving Using Non-standard Methods

  • Authors: Habel, J., Hašpica, R., doc. Dr. Ing. Jan Kyncl,
  • Publication: Technika osvětlování XIX. Plzeň: Česká společnost pro osvětlování, 2001. pp. 50-56.
  • Year: 2001

Non-standard Solving of Multiple Reflection

  • Authors: Habel, J., Hašpica, R., doc. Dr. Ing. Jan Kyncl,
  • Publication: Svetlo 2001. Bratislava: Dom techniky ZSVTS, 2001. pp. 270-275. ISBN 80-233-0467-4.
  • Year: 2001

Practical Calculation of Discomfort Glare Index Using UGR Method

  • Authors: Habel, J., Andrýsek, R., doc. Dr. Ing. Jan Kyncl,
  • Publication: Proceedings of Workshop 2001. Praha: České vysoké učení technické v Praze, 2001. pp. 680-681. ISBN 80-01-02335-4.
  • Year: 2001

Problems of Heating of Historical Buildings

  • Authors: doc. Dr. Ing. Jan Kyncl, Kubín, P.
  • Publication: Proceedings of Workshop 2001. Praha: České vysoké učení technické v Praze, 2001. pp. 694. ISBN 80-01-02335-4.
  • Year: 2001

Thermodynamic and Efficiency of Heating of Special Buildings

  • Authors: Kubín, P., doc. Dr. Ing. Jan Kyncl, Šváb, M., Němeček, M.
  • Publication: Proceedings of Workshop 2001. Praha: České vysoké učení technické v Praze, 2001. pp. 697. ISBN 80-01-02335-4.
  • Year: 2001

Research of methods determining well-being of interiors

  • Authors: Tůma, J., doc. Dr. Ing. Jan Kyncl, Habel, J., Aubrecht, L.
  • Publication: Elektroenergetika 2000. Ostrava: VŠB-TUO, 2000. pp. 66-70. ISBN 80-7078-809-7.
  • Year: 2000

Design and Modeling of Parts of Electroheat Devices Using MATHEMATICA SW

  • Authors: doc. Dr. Ing. Jan Kyncl, Kneifel, L.
  • Publication: First International Conference on Advanced Engineering Design. Glasgow: University of Glasgow, 1999. pp. 157-165.
  • Year: 1999

Mathematica 4

Optimal Proportion between Radiation and Convection due to PMV Formula

  • Authors: doc. Dr. Ing. Jan Kyncl, Krumphanzl, J.
  • Publication: ENTREE 99. Brussels: IEEE, 1999. pp. 179-188. ISBN 90-76760-01-2.
  • Year: 1999

Optimalisation of Energy Economy

  • Authors: Tůma, J., doc. Dr. Ing. Jan Kyncl, Kneifel, L.
  • Publication: Transfer '99. Brno: VUT v Brně, 1999. pp. 27-28. ISBN 80-214-1341-7.
  • Year: 1999

Phenomenological Equations of Electrical Arc Stability

  • Authors: doc. Dr. Ing. Jan Kyncl,
  • Publication: Proceedings of Workshop 99. Praha: České vysoké učení technické v Praze, 1999. pp. 290.
  • Year: 1999

Studium vybraných integrálních charakteristik

  • Authors: Habel, J., doc. Dr. Ing. Jan Kyncl, Straka, T.
  • Publication: Technika osvětlování XVII. Plzeň: Česká společnost pro osvětlování, 1999. pp. 44-57.
  • Year: 1999

The Determination of Glare Index of Linear Luminaires According to the UGR Method

  • Authors: doc. Dr. Ing. Jan Kyncl, Habel, J.
  • Publication: Proceedings of Workshop 99. Praha: České vysoké učení technické v Praze, 1999. pp. 293.
  • Year: 1999

Analyticke reseni cinitele oslneni

Experiences with an Improved Chanel Melting Furnace

  • Authors: doc. Dr. Ing. Jan Kyncl,
  • Publication: Induction Heating Seminar. Padova: Universita degli Studi di Padova, 1998. pp. 291-297. ISBN 88-86281-26-9.
  • Year: 1998

Graficke pomucky pro hodnoceni UGR metodou

One Method of Elimination of the Pinching Effect in Chanel Furnaces

  • Authors: doc. Dr. Ing. Jan Kyncl,
  • Publication: Workshop 98. Praha: České vysoké učení technické v Praze, 1998. pp. 651-652.
  • Year: 1998

Similarity Numbers Deriving from Transport Equations

  • Authors: doc. Dr. Ing. Jan Kyncl,
  • Publication: Poster 1995. Praha: České vysoké učení technické v Praze, Fakulta elektrotechnická, 1995. pp. 25.
  • Year: 1995

Water Saves in Diesel Units tests

Responsible person Ing. Mgr. Radovan Suk