Proceedings of the 11 th International Scientific Conference

Proceedings of the 11th International Scientific Conference

ELECTRIC POWER ENGINEERING 2010

BRNO UNIVERSITY OF TECHNOLOGY FACULTY OF ELECTRICAL ENGINEERING AND COMMUNICATION DEPARTMENT OF ELECTRICAL POWER ENGINEERING

Name:

Proccedings of the 11th International Scientific Conference Electric Power Engineering 2010

Publisher:

Brno University of Technology Faculty of Electrical Engineering and Communication Department of Electrical Power Engineering

Published: Editors: Edition: Circulation: Print: Cover: Price:

May 4, 2010, Brno, Czech Republic Jiří Drápela, Jan Macháček first 220 MSD, s. r. o., Brno, 2010 c 2010 Lindovský & Psota, Brno, 100 e

The authors are responsible for the contentual and lingual accuracy of their papers and the materials they present. Brno University of Technology, Faculty of Electrical Engineering and Communication, Department of Electrical c 2010. Power Engineering

ISBN 978 - 80 - 214 - 4094 - 4

TABLE OF CONTENTS Part A - Invited lectures Evaluation of the Methods for Harmonic Resonance Analyses in Power Systems . . . . . . . . . . . . . . . . 3 Kazimierz Wilkosz (Wroclaw University of Technology, Poland) Smart Metering and Ripple Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 György Morva, István Szén Óbuda (University of Budapest, Hungary) Advanced Adaptive Control for Thyristor Controlled Series Capacitors . . . . . . . . . . . . . . . . . . . . . 13 Nikolay Djagarov, Zhivko Grozdev, Milen Bonev (Technical University of Varna, Bulgaria), Michal Kolcun, Ľubomír Beňa, Daniel Hlubeň (The Technical University of Košice, Slovak Republic) Development Tendency of the Baltic Power System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 Anna Mutule, Irina Oleinikova, Artjoms Obushevs (Institute of Physical Energetics, Latvia) Fault Location on Power Transmission Lines with Use of Two - End Synchronised and Unsynchronised Measurements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 Jan Izykowski, Eugeniusz Rosolowski (Wroclaw University of Technology, Poland) Protecting Grid Connected Wind Farms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29 Zhibo Ma, Miles A. Redfern (University of Bath, United Kingdom) Příspěvek k strategickému významu elektroenergetiky . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33 Contribution to Strategic Significancy of Electrical Power Engineering Zdeněk Vostracký (University of West Bohemia in Pilsen, Czech Republic) Intelligent Measurement as the Decisive Factor into the Creation of the Strategy of the Energy - Efficiency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39 Jerzy Szkutnik (Cze˛stochowa University of Technology, Poland) Action and Reaction in Electrical Circuits - Part I . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43 Jaan Järvik (Tallinn University of Technology, Estonia) Action and Reaction in Electrical Equipment - Part II . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49 Jaan Järvik (Tallinn University of Technology, Estonia) Wind and Hydro Power Large - scale Integration With Energy Storage into Regional Power Grid . . . . . 55 Viktor V. Elistratov (Saint - Petersburg State Polytechnical University, Russia)

Part B - Power system management and operation, Electricity market PTDF Calculation in Network with Phase Shifting Transformers . . . . . . . . . . . . . . . . . . . . . . . . 61 Karel Máslo, Andrew Kasembe (ČEPS, a. s., Czech Republic) Středoevropský region jako kontext modelování trhu s elektřinou v České republice . . . . . . . . . . . . . 65 Central European Region As an Electricity Market Modeling Context in Czech Republic Petr Čambala, Michal Macenauer, Jan Toufar (EGÚ Brno, a. s., Czech Republic), Martin Hrubý (Brno University of Technology, Czech Republic) ZigBee Smart Energy profil v síti Smart Grid . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71 ZigBee Smart Energy Profile in the Smart Grid Aleš Krutina (University of West Bohemia in Pilsen, Czech Republic) Transmission Lines Loading Control using FACTS Systems . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75 Zdeněk Müller, Tomáš Sýkora, Jan Švec, Josef Tlustý (Czech Technical University in Prague, Czech Republic) The Size of Customers’ Loads Influence to Their Reconnection in the Reconfiguration . . . . . . . . . . . 83 Martin Paar (Brno University of Technology, Czech Republic)

EPE 2010, BRNO, CZECH REPUBLIC

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Numerical Stability of the Newton - Raphson Method in Load Flow Analysis . . . . . . . . . . . . . . . . . 87 Jan Veleba (University of West Bohemia in Pilsen, Czech Republic) Automatic Power Load Balancing using a Multi - Agent System . . . . . . . . . . . . . . . . . . . . . . . . . 93 Miroslav Prýmek, Aleš Horák (Masaryk University Brno, Czech Republic), Petr Baxant, (Brno University of Technology, Czech Republic) The Impact of FACTS Devices to Control the Load Flow . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 99 Stanislav Kušnír, Ľubomír Beňa, Michal Kolcun (The Technical University of Košice, Slovak Republic) Power Consumption Profiles and Potentials of Selected Electrical Appliances as Way to Regulate Electricity Network . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 105 Petr Baxant (Brno University of Technology, Czech Republic)

Part C - Transmission and distribution grids, Faults and protection of power networks Breaker Control Scheme for Rebuilding Networks containing Distributed Generation following System Disturbances . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 113 Wenting Shang, Miles A Redfern, R O’Gorman (University of Bath, United Kingdom) Analysis of Technical Losses in the Low and Medium Voltage Power Network . . . . . . . . . . . . . . . . 119 Anna Gawlak (Cze˛stochowa University of Technology, Poland) A New Fuzzy Differential Protection for Parallel Lines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 125 Krzysztof Solak, Waldemar Rebizant (Wroclaw University of Technology, Poland) Load Capacity and Transient Stability Analysis on Modified IEEE 14 Bus System using Power System Analysis Toolbox (PSAT) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 131 Joseph E. Essilfie, Josef Tlustý (Czech Technical University in Prague, Czech Republic) Dynamic Equivalents in Power System Stability Assessment . . . . . . . . . . . . . . . . . . . . . . . . . . . 135 Petr Mareček, Miroslav Müller, Zdeněk Müller, Jan Švec, Tomáš Sýkora, Josef Tlustý (Czech Technical University in Prague, Czech Republic) Rectangular Formulation of Power System State Estimation: A Critical Analysis of Different Solutions to the Problem of Zero - Injection Measurements . . . . . . . . . . . . . . . . . . . . 139 Tomasz Oko´ n, Kazimierz Wilkosz (Wroclaw University of Technology, Poland) Evaluation of Power Grid Development Using Newton - Rapshon Method . . . . . . . . . . . . . . . . . . . 145 Almabrok Abdoalhade Almabrok, Petr Toman (Brno University of Technology, Czech Republic) Ochrany a komunikace v Smart Grid . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 151 Protections and Communications in Smart Grid Luboš Frank (University of West Bohemia in Pilsen, Czech Republic) Influence of Parameters of Electrical Power System on Rise and Course of Ferroresonance Overvoltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 153 Branislav Bátora, Petr Toman (Brno University of Technology, Czech Republic) CCT - Basic Criteria of Power System Transient Stability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 157 Žaneta Eleschová, Anton Beláň (Slovak University of Technology Bratislava, Slovak Republic) Impact of PST Transformers on Short - circuit Conditions of the Power System . . . . . . . . . . . . . . . 163 Vladimír Krištof, Daniel Hlubeň, Michal Kolcun (The Technical University of Košice, Slovak Republic) Possible Application of Triangulation Principles for Fault Location in 22 kV Distribution Network . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 169 Marek Höger, Peter Braciník (University of Žilina, Slovak Republic) Negative Effects of the Earth Fault in Isolated Neutral System IT/500V on Rolling Mill for Rail Plant . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 173 Tomáš Sniegoň, Jiří Gurecký (VŠB - Technical University of Ostrava, Czech Republic)

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Podíl vlivu svodu na výpočty chodu sítě u vedení 110 kV až 750 kV . . . . . . . . . . . . . . . . . . . . . . 177 Share of Influence of the Leakage on Calculation of Network Working at the Line of 110 kV to 750 kV Ladislav Rudolf (University of Ostrava, Czech Republic) Aplikace softwaru pro výpočty technických ztrát na vedení přenosové soustavy . . . . . . . . . . . . . . . . 181 Application of Software for Calculations of Technical Losses on the Line of the Transmission System Ladislav Rudolf (University of Ostrava, Czech Republic), Vladimír Král (VŠB - Technical University of Ostrava, Czech Republic) Porovnání simulace transientních jevů v programu EMTP - ATP a PSCAD . . . . . . . . . . . . . . . . . . 187 Confrontation of Transient Phenomena Simulation in EMTP - ATP and PSCAD David Topolánek, Petr Toman (Brno University of Technology, Czech Republic) Kompenzace vlivu paralelního vedení nastavením zemního poměru distančních ochran . . . . . . . . . . . 191 The compensation of a Influence Parallel Line by Setting of a Ground Rate of a Distance Protection Jiří Bermann (ABB, s. r. o., Czech Republic) Protection of Distribution Network with Inserted Underground Cables . . . . . . . . . . . . . . . . . . . . . 197 Jaroslava Orságová, Petr Toman (Brno University of Technology, Czech Republic) TKSL and Wave Partial Differential Equation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 201 Jiří Kunovský, Alexandr Szöllös, Václav Šátek (Brno University of Technology, Czech Republic)

Part D - Power generation, Dispersed generation and its integration Computer Modelling of Electrical Precipitation and Separation . . . . . . . . . . . . . . . . . . . . . . . . . 209 Roman Cimbala (The Technical University of Košice, Slovak Republic), Milan Bernát, Renáta Bernátová (University of Presov in Presov, Slovak Republic) Production Conditions Analysis of Cogeneration Units Based on Gas Engine and Gas Turbine . . . . . . . 215 Nail Khisamutdinov, Petr Toman (Brno University of Technology, Czech Republic) Experiences with Examination of Dispersed Sources Impact on Distribution Power System . . . . . . . . 219 Jozef Rusnák, Ľubomír Beňa, Michal Kolcun (The Technical University of Košice, Slovak Republic) Nasazení fotovoltaické elektrárny v lokální distribuční soustavě Letiště Ostrava, a. s. . . . . . . . . . . . . 223 Placing of Photovoltaic Power Station in Local Distribution System of Airport Ostrava, a. s. Milan Messerschmidt, Jiří Gurecký (VŠB - Technical University of Ostrava, Czech Republic) Zvyšovanie využitia primárnej energie v systémoch s kogeneračnými jednotkami . . . . . . . . . . . . . . . 229 Cogeneration Waste Heat Conversion to Electric Power Marek Pípa, Juraj Kubica, František Janíček (Slovak University of Technology Bratislava, Slovak Republic) Evaluation Factors in Carbon Capture Technologies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 233 Tomáš Bartošík, Petr Mastný (Brno University of Technology, Czech Republic) Vliv kogenerační výroby tepla a elektřiny na příkladu Elektrárny Poříčí II . . . . . . . . . . . . . . . . . . . 237 Influence of Cogeneration in Heat and Electricity Production on Example of Power Station Poříčí II Jiří Beneš, Zbyněk Martínek (University of West Bohemia in Pilsen, Czech Republic) Feedback Effects Definition of Alternative Electric Energy Sources Connected to the Distribution Power Network . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 243 Ondřej Procházka, Jiří Gurecký, Stanislav Mišák (VŠB - Technical University of Ostrava, Czech Republic) Operating Mode of Permanent Magnet Synchronous Generator . . . . . . . . . . . . . . . . . . . . . . . . . 249 Václav Sládeček, Petr Palacký, David Slivka, Petr Hudeček (VŠB - Technical University of Ostrava, Czech Republic) Využití obnovitelných zdrojů energie k napájení svítidel veřejného osvětlení . . . . . . . . . . . . . . . . . . 253 Use of Renewable Energy to Power public Lighting Luminaire Tomáš Novák, Stanislav Mišák, Karel Sokanský (VŠB - Technical University of Ostrava, Czech Republic) Quality of Electric Power Supplied by Co - generation Unit with Landfill Gas Combustion . . . . . . . . . . 257 Jiří Gurecký, Petr Moldřík (VŠB - Technical University of Ostrava, Czech Republic)


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Zpětné vlivy větrných elektráren na napájecí síť . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 261 Impact of Wind Power Plants on Distribution Systems Power Quality Daniel Spáčil, Pavel Santarius (VŠB - Technical University of Ostrava, Czech Republic) Optimisation of Operation of Wind Power Generators in Distribution System . . . . . . . . . . . . . . . . . 267 František Střída, Martin Mach, Stanislav Rusek (VŠB - Technical University of Ostrava, Czech Republic) Domestic Cogeneration Units Scheme with Gas Boiler and with Heat Accumulator . . . . . . . . . . . . . 271 Nail Khisamutdinov, Petr Toman (Brno University of Technology, Czech Republic) Hodnocení poruch armatur v jaderných elektrárnách . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 277 Investigation of Fitting Defects in Nuclear Power Plants Jiří Raček (Brno University of Technology, Czech Republic)

Part E - Renewable energy sources, Energy accumulation and storage devices Case Study of Cyprus: Wind Energy or Solar Power? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 283 Davut Solyali, Miles A. Redfern (University of Bath, United Kingdom) Optimalizace větrné elektrárny s využitím programu EMTP - ATP . . . . . . . . . . . . . . . . . . . . . . . . 291 Wind Power Plant Optimalization by EMTPl - ATP Stanislav Mišák, Veleslav Mach (VŠB - Technical University of Ostrava, Czech Republic) Analýza technických a ekonomických parametrů hybridních systémů . . . . . . . . . . . . . . . . . . . . . . 295 Technical - Economic Analysis of Hybrid Off - Grid Power System Stanislav Mišák, Lukáš Prokop (VŠB - Technical University of Ostrava, Czech Republic) Predikce výroby elektrické energie z větrných elektráren . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 301 Prediction System for Energy Production from WPP Stanislav Mišák, Lukáš Prokop (VŠB - Technical University of Ostrava, Czech Republic) Hodnocení efektivity práce tepelných čerpadel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 307 Effectiveness Evaluation of Heat Pump Operation Mojmír Vrtek (VŠB - Technical University of Ostrava, Czech Republic) Design and Material Modification of Heat Engine Compression Cylinder . . . . . . . . . . . . . . . . . . . . 313 Jan Macháček (Brno University of Technology, Czech Republic) The Design of a Thermoelectric Generator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 317 Jan Gregor, Ivana Jakubová (Brno University of Technology, Czech Republic) Towards Renewable Energy Sources . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 323 Miroslava Smitková, František Janíček, Ivan Daruľa (Slovak University of Technology Bratislava, Slovak Republic) Využití tepelného čerpadla pro chlazení fotovoltaického panelu . . . . . . . . . . . . . . . . . . . . . . . . . 327 Utilization of Heat Pump for Cooling of Photovoltaic Module Jiří Polívka (University of West Bohemia in Pilsen, Czech Republic) Vyhodnocení provozních účinností větrné elektrárny . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 331 Operating Efficiency Diagnostics Wind Power Plant Tomáš Mlčák, Stanislav Mišák (VŠB - Technical University of Ostrava, Czech Republic) Photovoltaic Power Plants in the Electricity System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 335 Jan Novotný, Antonín Matoušek (Brno University of Technology, Czech Republic) Maximalizace získávání elektrické energie z fotovoltaického panelu . . . . . . . . . . . . . . . . . . . . . . . 339 Maximal Energetic Effect of Solar Photovoltaic Cell Ludvík Koval, Mojmír Vrtek, Petr Bilík (VŠB - Technical University of Ostrava, Czech Republic) Vlivy provozních podmínek na elektroniku obnovitelných zdrojů . . . . . . . . . . . . . . . . . . . . . . . . . 345 The Influence of Environment on Renewable Source Electronics Marek Tučan, Pavel Žák (Czech Technical University in Prague, Czech Republic)

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Pokusná bioplynová stanica so suchou fermentáciou a KGJ . . . . . . . . . . . . . . . . . . . . . . . . . . . . 351 Experimental Biogas Station with Dry Fermentation and Cogeneration - unit Marek Pípa, Juraj Kubica, František Janíček (Slovak University of Technology Bratislava, Slovak Republic) Laboratórium OZE na FEI STU v Bratislave . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 355 Laboratory of RES on Slovak University of Technology in Bratislava Marek Pípa, Juraj Kubica, František Janíček (Slovak University of Technology Bratislava, Slovak Republic) Operation Characteristics of Hydrogen Proton Exchange Membrane Fuel Cells . . . . . . . . . . . . . . . . 359 Petr Moldřík, Roman Chválek, Robert Šebesta (VŠB - Technical University of Ostrava, Czech Republic) Grid Connection of Photofoltaic Sources - Legislative Requirements . . . . . . . . . . . . . . . . . . . . . . . 365 Jana Jiřičková, Milan Krasl, Rostislav Vlk (University of West Bohemia in Pilsen, Czech Republic) The Usage of Compressed Air Energy Storage in Cooperation of Geothermal Energy in the Czech Republic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 369 Lukáš Radil, Petr Mastný (Brno University of Technology, Czech Republic) Simulation Cycle of Heat Pump by the help of Wolfram Mathematica . . . . . . . . . . . . . . . . . . . . . 375 Lukáš Radil, Petr Mastný (Brno University of Technology, Czech Republic) Efektivnost výroby tepla a chladu při využití solární energie . . . . . . . . . . . . . . . . . . . . . . . . . . . 379 Effective Heat and Cold Production with the Use of Solar Energy Iva Pešková, Karel Štrunc, Zbyněk Martínek (University of West Bohemia in Pilsen, Czech Republic) Designing Energy Systems for Low Energy Buildings With the Support of Knowledge Technologies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 385 Petr Mastný, Zuzana Mastná (Brno University of Technology, Czech Republic) Tepelná čerpadla, obnovitelný zdroj energie pro aulu na VŠB - TU Ostrava . . . . . . . . . . . . . . . . . . 391 Heat Pumps, Renewable Energy Source for the University Hall VŠB - TU Ostrava Zdeněk Hradílek, Petr Zach (VŠB - Technical University of Ostrava, Czech Republic) Stochastics in the Electricity Generation in Wind and Photovoltaic Power Stations . . . . . . . . . . . . . 395 Martin Vysloužil, Zdeněk Hradílek (VŠB - Technical University of Ostrava, Czech Republic) Reliability of Electricity Power Supplies from Renewable Sources . . . . . . . . . . . . . . . . . . . . . . . . 401 Zdeněk Hradílek, Tomáš Šumbera (VŠB - Technical University of Ostrava, Czech Republic) Photovoltaic Sources for Hydrogen Production in VSB - TU Ostrava Laboratory . . . . . . . . . . . . . . . 407 Roman Chválek, Zdeněk Hradílek, Petr Moldřík (VŠB - Technical University of Ostrava, Czech Republic) Možnosti splnění požadavků EU v oblasti obnovitelných zdrojů v podmínkách ČR . . . . . . . . . . . . . . 413 Possibilities of the Czech Republic to Fulfil EU Requirements in Renewable Sources Area Jiří Ptáček, Petr Modlitba, Tomáš Špaček, Jiří Malý (EGÚ Brno, a. s., Czech Republic)

Part F - EMC, Power quality and metering Methods for Detection of Sub - harmonics in Power Systems . . . . . . . . . . . . . . . . . . . . . . . . . . . 421 Sabino Giarnetti, Fabio Leccese (University Roma Tre, Italy), Zbigniew Leonowicz (Wroclaw University of Technology, Poland) Advanced CFD Application in Medium Voltage Instrument Transformers and Sensors Development and Manufacturing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 427 David Raschka, Petr Michlíček (ABB, s. r. o., Czech Republic) Design of Transducers Matching Requirements of Microprocessor - Based Equipment . . . . . . . . . . . . 431 Radek Javora, Pavel Váňo (ABB, s. r. o., Czech Republic) Problematika vyhodnocování parametru flicker . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 437 Problems when Evaluating the Flicker Martin Kašpírek (E.ON, s. r. o., Czech Republic)


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Experimentální ověření vlivu filtračně - kompenzačního zařízení na provoz trakční transformovny . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 441 Experimental verification of tuned capacitor bank impact on traction transformer sub - station Petr Orság, Stanislav Kocman , Jaroslav Kýpus (VŠB - Technical University of Ostrava, Czech Republic) Postprocessing rozsáhlých datových souborů měření . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 445 Postprocessing of Large Measurement Datasets Stanislav Sumec, Petr Baxant (Brno University of Technology, Czech Republic) Vliv kvality napájecího napětí na provozní vlastnosti pulzního usměrňovače . . . . . . . . . . . . . . . . . . 449 The Voltage Power Quality Impact to the Pulse Rectifier Operating Properties Stanislav Kocman, Petr Orság, Jaroslav Kypús (VŠB - Technical University of Ostrava, Czech Republic) A Light - flickermeter - Part I: Design . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 453 Jiří Drápela, Jan Šlezingr (Brno University of Technology, Czech Republic) A Light - flickermeter - Part II: Realization and Verification . . . . . . . . . . . . . . . . . . . . . . . . . . . . 459 Jiří Drápela, Jan Šlezingr (Brno University of Technology, Czech Republic) Elektronický předřadník s pasivním kapacitním PFC obvodem a nábojovou pumpou . . . . . . . . . . . . . 465 Electronic Ballast with Charge Pumped Valley - Fill Passive PFC Jan Pithart, Jiří Drápela (Brno University of Technology, Czech Republic) Návrh simulátoru kolísání napětí . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 469 Design of a Voltage Fluctuation Simulator Jan Šlezingr, Jiří Drápela (Brno University of Technology, Czech Republic) Comparison of Voltage Events Detection Methods . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 473 Jaromír Bok, Jiří Drápela (Brno University of Technology, Czech Republic) Vliv délky vyhodnocovacího intervalu veličin na výsledky vybraných parametrů kvality elektřiny . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 479 The Impact of the Aggregation Interval Length on Selected Power Quality Quantities and Their Results Jan Žídek, Petr Bilík, Daniel Kaminský (VŠB - Technical University of Ostrava, Czech Republic) Statistické zpracování veličin se dvěma limity pro hodnocení kvality elektrické energie . . . . . . . . . . . 483 Statistical Data Processing of two Limits Quantities for Power Quality Evaluation Purposes Jan Žídek, Petr Bilík, Daniel Kaminský (VŠB - Technical University of Ostrava, Czech Republic) Selected Aspects of Evaluation of Complete Frequency Spectra up to 9 kHz According to Valid International Standard . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 489 Petr Bilík (VŠB - Technical University of Ostrava, Czech Republic) Vliv změn druhého vydání IEC61000 - 4 - 15 na implementaci měřiče blikání . . . . . . . . . . . . . . . . . . 493 Planned Changes in the Second Edition of IEC61000 - 4 - 15 and Their Impact on Flickermeter Specification Petr Bilík (VŠB - Technical University of Ostrava, Czech Republic) Analyzátor výkonů a účinnosti frekvenčních měničů na platformě cRIO . . . . . . . . . . . . . . . . . . . . . 497 Frequency Converter Power and Efficiency Analyzer Based on cRIO Platform Marek Hořínek, Petr Pětvaldský, Petr Bilík (VŠB - Technical University of Ostrava, Czech Republic) Testování odezvy zdrojů nepřetržitého napájení (UPS) na krátkodobé poklesy, zvýšení a přerušení napětí . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 503 Testing of Uninterruptable Power Supplies (UPS) Response on Short Time Voltage Dips, Swells and Interruptions Petr Pětvaldský, Marek Hořínek, Petr Bilík (VŠB - Technical University of Ostrava, Czech Republic) Možnosti rozšíření analyzátorů kvality o vyhodnocování synchronních fázorů a synchronizované měření přechodných dějů . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 507 Extension of Power Quality Analyzer Functionality for Synchrophasor Evaluation and Synchronized Measurement of Transient Signals Jakub Maňas, Petr Bilík (VŠB - Technical University of Ostrava, Czech Republic)

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Záznamník provozních a poruchových stavů pro systém akumulace elektrické energie z obnovitelných zdrojů (OZE) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 511 Datalogger for Operational and Disturbance Signals Monitoring Intended for Electrical Energy Accumulation System Using Renewable Energy Sources Jakub Maňas, Petr Bilík (VŠB - Technical University of Ostrava, Czech Republic) Vývoj prenosného VN systému pre meranie prúdu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 517 Development of portable high - voltate system for current measurement Attila Kment, Marek Pípa (Slovak University of Technology Bratislava, Slovak Republic) Porovnání výsledků vyhodnocení blikání řady PQ analyzátorů na opakovatelných kolísajících napěťových signálech odpovídajících některým typickým spotřebičům . . . . . . . . . . . . . . . 521 The Flickermeter Results Comparison Using Reproducible Voltage Varying Signals Corresponding with some Typical Loads Martin Kašpírek (E.ON, s. r. o., Czech Republic), Petr Bilík (VŠB - Technical University of Ostrava, Czech Republic) Influence of Power Semiconductor Converters Setup on the Quality of Electrical Energy from Renewable Sources . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 527 Václav Sládeček, Petr Palacký, David Slivka, Martin Sobek (VŠB - Technical University of Ostrava, Czech Republic) Praktické měření kvality elektrické energie a možnost zlepšení její kvality . . . . . . . . . . . . . . . . . . . 533 Experiences with Measuring Power Quality in Real Operating Conditions Petr Hečko, Alena Otčenášová (University of Žilina, Slovak Republic) Testing of Appliances Immunity to Voltage Dips and Short Interruptions under Laboratory Conditions and Practical Usage of Results . . . . . . . . . . . . . . . . . . . . . . . . . . . 539 Jaromír Bok, Jiří Drápela (Brno University of Technology, Czech Republic) Active Power Filters and their Applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 545 Petr Simonik, Pavel Brandstetter, Petr Chlebis (VŠB - Technical University of Ostrava, Czech Republic) Spolupráce trakční a energetické soustavy z hlediska EMC . . . . . . . . . . . . . . . . . . . . . . . . . . . . 551 Cooperation of Traction Transformer Substation with Electric Power System in term of EMC Petr Mičulka, Josef Paleček, Václav Kolář, Vítězslav Stýskala (VŠB - Technical University of Ostrava, Czech Republic) Analýza vlivu trakční transformovny Velešín na napájecí soustavu z hlediska nesymetrie . . . . . . . . . . 555 An Analysis of the Influence of Traction Transformer Substation in Velesin on Power Network in Terms of Unbalance Václav Kolář, Josef Paleček, Petr Mičulka, Vítězslav Stýskala (VŠB - Technical University of Ostrava, Czech Republic) Analýza stavu kvality napětí v distribuční síti, očekávané náklady na zajištění požadavků normy ČSN EN 50160 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 559 Analysis of Voltage Quality Condition in Distribution Systems and Expected Costs to Meet the Standard ČSN EN 50160 Requirements Martin Kašpírek (E.ON, s. r. o., Czech Republic) Metoda pro rychlé a korektní kontinuální měření jalového výkonu pro výpočetně omezené mikroprocesory . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 563 Method for Fast and Precise Calculation of Reactive Power for Computationally Limited Microprocessors Jan Kraus, Tomáš Tobiška (Technical University of Liberec, Czech Republic)

Part G - Power grids and systems reliability Practical and Theoretical Methods of Reliability Securing in Transmission and Distribution Network . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 569 Antons Kutjuns, Laila Zemite, Kristina Berzina (Riga Technical University, Latvia)


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Error Estimation of Monte Carlo Reliability Model of Power Distribution Network . . . . . . . . . . . . . . 573 Pavel Praks, Tadeusz Sikora (VŠB - Technical University of Ostrava, Czech Republic) Sensitivity Analysis of Monte Carlo Electric Power Grid Reliability Calculation . . . . . . . . . . . . . . . . 577 Tadeusz Sikora, Vladimír Král, Stanislav Rusek, Radomír Goňo (VŠB - Technical University of Ostrava, Czech Republic) Analysis of Failure Databases . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 581 Radomír Goňo, Michal Krátký, Stanislav Rusek (VŠB - Technical University of Ostrava, Czech Republic) Possibilities of Using Multi - Dimensional Statistical Analyses Methods When Evaluating Reliability of Distribution Networks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 587 Lukáš Geschwinder, Petr Toman (Brno University of Technology, Czech Republic) The Solution for Repairable Units . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 593 Zbyněk Martínek, Veronika Královcová (University of West Bohemia in Pilsen, Czech Republic) Současné trendy v rozvoji distribučních sítí s ohledem na nepřetržitost distribuce . . . . . . . . . . . . . . 599 Present Trends in Distribution System Development with Regard to Supply Continuity Petr Skala, Václav Dětřich (EGÚ Brno, a. s., Czech Republic) Oceňování nedodané elektrické energie . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 605 Estimation of Energy not Supply Zdenek Medvec (VŠB - Technical University of Ostrava, Czech Republic) Statistical Monitoring of Failures - Methods and Use . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 611 Blanka Šedivá, Eva Wagnerová, František Vávra, Tomáš Ťoupal, Patrice Marek (University of West Bohemia in Pilsen, Czech Republic) Decision - making Models of MCA and Supporting Software for Electric Power Engineering . . . . . . . . 617 Jiří Gurecký, Petr Moldřík (VŠB - Technical University of Ostrava, Czech Republic) Cascade and Independent Malfunctions and Damages of Safety Systems in Terms of a Nuclear Accident . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 623 Michal Ptáček, Antonín Matoušek (Brno University of Technology, Czech Republic)

Part H - Power network elements and diagnostics Moderní principy testování silnoproudých rozváděčů . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 631 Modern Testing Principles of High Power Distribution Boxes Tomáš Wittassek, Jan Žídek (VŠB - Technical University of Ostrava, Czech Republic) New Approach of Thermal Field and Ampacity of Underground Cables Using Adaptive hp - FEM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 639 Miroslav Müller,Josef Tlustý (Czech Technical University in Prague, Czech Republic) PhanTu Vu (HoChiMinhCity Univeristy of Technology, Vietnam) High Frequency Signals Transmitting via Low Voltage Installations . . . . . . . . . . . . . . . . . . . . . . . 645 Pavel Mindl, Tomáš Jukl, Zdeněk Čeřovský (Czech Technical University in Prague, Czech Republic) Measurement of Surface Discharge in Electroinsulating Liquids . . . . . . . . . . . . . . . . . . . . . . . . . 649 Iraida Kolcunová, Martin Marci (The Technical University of Košice, Slovak Republic) Měření teploty prostřednictvím optovláknových senzorů v energetice . . . . . . . . . . . . . . . . . . . . . . 655 Temperature Measurements by Fibre Optic Sensors in Power Industry Michal Mazanec (SAFIBRA, s. r. o., Czech Republic) Theoretical Analyses of a Substation Grounding System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 659 Jan Sedláček (University of West Bohemia in Pilsen, Czech Republic) Numerical Analysis of a 25kV Bus Holder . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 663 Jan Sedláček, Jiří Laurenc (University of West Bohemia in Pilsen, Czech Republic)

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Fyzikální jevy kontaktních sestav . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 667 Physical Phenomena in contact assemblies Jana Jiřičková, Štěpán Rusňák, Rostislav Vlk (University of West Bohemia in Pilsen, Czech Republic) Využití programového prostředí ANSYS, pro optimalizaci vodičů venkovního vedení . . . . . . . . . . . . . 671 Optimization of overhead lines using ANSYS SW Stanislav Mišák, Štefan Hamacek (VŠB - Technical University of Ostrava, Czech Republic) Porovnání modelů alternátoru v modelovacích nástrojích vhodných pro elektroenergetiku . . . . . . . . . 677 Comparison of Alternator Models in Modeling Tools Suitable for Power Engineering Lucie Noháčová, Karel Noháč (University of West Bohemia in Pilsen, Czech Republic) Modelování izolačních vad ve statorovém vinutí turbogenerátoru . . . . . . . . . . . . . . . . . . . . . . . . 683 Modelling of Insulating Defects in Stator Winding of Turbo Generator Jan Klasna, Petr Martínek, Josef Pihera (University of West Bohemia in Pilsen, Czech Republic), Radek Fanta (BRUSH SEM, s. r. o., Czech Republic) Intelligent Diagnostic Unit of a Drive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 687 Petr Palacký, Petr Hudeček David Slivka, Martin Sobek, Václav Sládeček (VŠB - Technical University of Ostrava, Czech Republic) Zvýšení účinnosti synchronního generátoru s permanentními magnety pro větrnou elektrárnu . . . . . . . 693 Increasing of Efficiency of PM Synchronous Generator for Wind - Power Plant Petr Kačor, Stanislav Mišák (VŠB - Technical University of Ostrava, Czech Republic) Měření propuštěné energie v jističi nízkého napětí při zkratu . . . . . . . . . . . . . . . . . . . . . . . . . . . 697 Measurement of Let - Through Energy of Low Voltage Cirit Breakers in Short - Circuit Condition Petr Kačor (VŠB - Technical University of Ostrava, Czech Republic) Eliminace emisního hluku elektrických strojů a přístrojů pomocí protifáze . . . . . . . . . . . . . . . . . . . 701 Electrical devices noise emissions elimination using anti - phase concept Viktor Pokorný (VŠB - Technical University of Ostrava, Czech Republic) Metódy snímania čiastkových výbojov v izolačných systémoch vysokonapäťových zariadení . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 707 Partial Discharge Measuring Methods in The Case of High Voltage Insulation Systems Jaroslav Petráš, Jaroslav Džmura, Jozef Balogh (The Technical University of Košice, Slovak Republic) Výskyt whiskerů rizikem pro funkci elektrárny . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 711 Whisker’ Appearance Risk for Power Plant Functionality Pavel Žák, Ivan Kudláček (Czech Technical University in Prague, Czech Republic) Stárnutí výkonových transformátorů . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 717 Power Transformer Ageing Eva Müllerová (University of West Bohemia in Pilsen, Czech Republic), Jan Hrůza (ETD TRANSFORMÁTORY, a. s., Czech Republic) Analysis of Issues in Long - therm Thermovision Measurements in Distribution Networks . . . . . . . . . . 721 Miroslav Hrabčík, Radomír Goňo (VŠB - Technical University of Ostrava, Czech Republic) Experimental Analysis of Temperature Influence on Idly Currents Parameters of Types Toroid Transformers Compared with Conventional Types of Transformers . . . . . . . . . . . . . 727 Aleš Folvarčný, Martin Marek (VŠB - Technical University of Ostrava, Czech Republic) Thermal Analysis of HV Type Traction Disconnector Using FEM . . . . . . . . . . . . . . . . . . . . . . . . 733 Regina Holčáková, Martin Marek (VŠB - Technical University of Ostrava, Czech Republic) The Change of Relaxation Current Pattern Due to Forced Thermal Aging of Sintered Ceramics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 739 Bystrík Dolník, Juraj Kurimský (The Technical University of Košice, Slovak Republic) Thermal Dependency of Dielectric Properties of Liquid Insulating Materials . . . . . . . . . . . . . . . . . 746 Roman Cimbala, Iraida Kolcunová, Lýdia Dedinská, Vieroslava Čačková (The Technical University of Košice, Slovak Republic)


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Economical and Technical Problems of High Voltage Power Line Construction and Modernization with the Use of High - temperature Low Sag Wire Technology . . . . . . . . . . . . . . 749 Jerzy Szkutnik (Cze˛stochowa University of Technology, Poland), Krystyna Baum (ENION S.A, Poland) Vybrané principy elektroenergetiky . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 753 Veleslav Mach (VŠB - Technical University of Ostrava, Czech Republic)

Part I - Power electronics, electric power applications Experimentální určení celkového součinitele přestupu tepla mezi předřadníkem a vnitřním prostorem svítidla . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 757 Experimental Determination of the Heat - Transfer Coefficient Between a Ballast and a Lighting unit Interior Miroslav Müller, Jan Kyncl (Czech Technical University in Prague, Czech Republic) Nalezení optimálního tvaru elektromagnetu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 761 Finding the Optimal Shape of the Electromagnet Stanislav Zajaczek, Lubomír Ivánek, Phan Thi Thanh Thao (VŠB - Technical University of Ostrava, Czech Republic) Analýza pohonů velkých výkonů ve vlastní spotřebě energobloku . . . . . . . . . . . . . . . . . . . . . . . . 765 Analysis of Big Drives in Internal Consumption of Powerblock Zdeněk Vostracký, Václav Pašek, Martin Kadera (University of West Bohemia in Pilsen, Czech Republic) Transport Coefficients of Air and Argon Plasmas . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 769 Ilona Lázničková (Brno University of Technology, Czech Republic) Thermal Plasma Parameters Determining Techniques . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 775 Jan Gregor, Ivana Jakubová, Tomáš Mendl, Josef Šenk (Brno University of Technology, Czech Republic) Properties of a DC Arc Plasma Generator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 781 Jan Gregor, Ivana Jakubová, Josef Šenk (Brno University of Technology, Czech Republic) The New Type of Resonant Active Power Filter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 787 Petr Simonik, Petr Chlebis, Zdenek Pfof, Petr Vaculik (VŠB - Technical University of Ostrava, Czech Republic) Modern Wiring System as Building Management System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 791 Branislav Bátora, Petr Toman, Jan Macháček (Brno University of Technology, Czech Republic) Vývoj ionizačního zapalovacího zdroje pro plazmový generátor . . . . . . . . . . . . . . . . . . . . . . . . . . 795 Development of Ionization Source for Plasma Generator Pavel Kloversa, Jaroslav Fait (University of West Bohemia in Pilsen, Czech Republic) Control of Lighting Systems Using Compact Systems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 797 Jan Škoda, Petr Baxant (Brno University of Technology, Czech Republic) Comparison of Efficiency of Luminaire by the Shape of the Luminous Intensity Curve . . . . . . . . . . . . 799 Jan Škoda, Petr Baxant (Brno University of Technology, Czech Republic) Comparison of Lighting Regulators in Terms of Energy Savings and Operational Parameters . . . . . . . 803 Tomáš Pavelka, Petr Baxant (Brno University of Technology, Czech Republic) Marketing Study of the Electric Vehicles’ Diffusion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 807 Eva Chlebišová, Jana Kyzeková, Hana Svobodová (VŠB - Technical University of Ostrava, Czech Republic) Optimalizace měření příkonu tepelného zařízení s pulzním řízením . . . . . . . . . . . . . . . . . . . . . . . 813 Optimization of pulse controlled heat load input power measurement Vladimír Král, Zdeněk Hradílek (VŠB - Technical University of Ostrava, Czech Republic) Asynchronous Motor Working as Generator with VSI using Flux Field Oriented Control . . . . . . . . . . 817 Petr Palacký, Martin Sobek, Petr Hudeček, David Slivka, Václav Sládeček (VŠB - Technical University of Ostrava, Czech Republic)

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Electric Car with Induction Motor Supplied by Voltage Inverter . . . . . . . . . . . . . . . . . . . . . . . . . 823 Ivo Neborak, Petr Skotnica (VŠB - Technical University of Ostrava, Czech Republic) Využití zapojení snižujícího měniče napětí v obvodu střídavého napájení . . . . . . . . . . . . . . . . . . . . 827 Use of the Buck Converter in AC Circuits Michal Brejcha (Czech Technical University in Prague, Czech Republic) Úspory energie v osvětlování při hodnocení energetické náročnosti budov . . . . . . . . . . . . . . . . . . . 833 Energy Savings in Lighting When Assessing the Energy Performance of Buildings Karel Sokanský, Tomáš Novák, Jaroslav Šnobl (VŠB - Technical University of Ostrava, Czech Republic) Innovative Research of Modern Types Magnetic Lens and Chambers of Electron Microscopes - Magnetic Properties of Lens Steel and Simulation of Layout Magnetic Field . . . . . . . . . 837 Martin Marek, Regina Holčáková, Aleš Folvarčný, Petr Urbánek, Ladislav Jelen (VŠB - Technical University of Ostrava, Czech Republic) Vector Pulse - Width Modulation for Voltage Source Inverter Using Artificial Neural Network . . . . . . . 843 Pavel Brandštetter, Martin Kuchař, Petr Šimoník (VŠB - Technical University of Ostrava, Czech Republic) Vyšetřování magnetických polí v okolí jízdní kolejnice stejnosměrné vozby . . . . . . . . . . . . . . . . . . . 847 Magnetic Fields in the Vicinity of Rail DC Electric Railways Tomáš Kotrle, Petr Kačor, Josef Paleček (VŠB - Technical University of Ostrava, Czech Republic) Vyšetřování magnetického pole v okolí jízdní kolejnice jednofázové vozby . . . . . . . . . . . . . . . . . . . 853 Magnetic Fields in the Vicinity of Rail AC Electric Railways Marcela Machová, Martin Marek, Václav Kolář (VŠB - Technical University of Ostrava, Czech Republic) Public Lighting Part Measurement for Night Sky Glare increasing Before and After Switching Off Big Area (Liberec District in the Czech Republic) . . . . . . . . . . . . . . . . . . 857 Tomáš Novák, Karel Sokanský, František Dostál (VŠB - Technical University of Ostrava, Czech Republic)


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ELECTRIC POWER ENGINEERING 2010

Experiences with Examination of Dispersed Sources Impact on Distribution Power System Jozef Rusnák1), Ľubomír Beňa2), Michal Kolcun3) Technical University of Košice, Department of Electric Power Engineering, Mäsiarska 74, 041 20 Košice, www.tuke.sk/fei-kee/kee-a.html 1) tel: +421 55 6023553, email: [email protected], 2) tel: +421 55 6023561, email: [email protected], 3) tel: +421 55 6023550, email: [email protected].

ABSTRACT A lot of small power sources (dispersed sources) are going to be connected into LV an MV distribution networks in Slovakia. According to Distribution System Operators the impact of each individual dispersed source on the distribution system before its real connection has to be examined. The article deals with some experiences achieved during the examination of dispersed sources impact on distribution power system. Keywords: Dispersed Sources, Distribution Power System, Voltage Level, Short-Circuit.

1 INTRODUCTION New energy policy of European Union and development of new green technologies in electric power engineering led to increased interest in dispersed sources. To achieve maximum potential benefits of these sources in electrical power systems a serious network analysis leading to optimal size and placement of these sources becomes an important factor. Influence of distributed sources should be considered not only in real time, i.e. operative category, but in categories of long-term development of the power system and grid. [1] Connection of these sources to the distribution grid is realized under specific conditions and with using suitable procedure. These procedures are in the Slovak Republic specified by the Electrical Distribution System Operators [2]. The important factor before a real connection of a dispersed source is to examine the impact of this source on distribution power system. Usually the study about influence of a connected source on distribution power system includes: • technical characteristic of the source with technical parameters of transformers connecting this source with the grid; • analysing of real and reactive power flow and voltage profile in normal and contingency conditions; • impact of the new source on electrical power losses [4], [6]; • impact of the new source on loading of power lines and transformers operated within the distribution power system [5]; • short circuit power and current analysis at a connection point;

• specifying of influence of the connected source on energy quality (flicker, higher harmonics, impact on a level of signal of centralised control of loads); • analysis of chosen reliability indicators [3]. This study specifies connection conditions and leads to optimisation of the operation of the connected dispersed source within the electrical network. Next chapters show some experiences achieved during the examination of dispersed sources on voltage level and shortcircuit level in the distribution power system.

2 DESCRIPTION OF EXAMINED NETWORK The examined network is 22 kV (HV) distribution power network which is feeding with 110 kV power system through network transformer. Configuration of electrical network is in the Figure 1. The important electrical parameters for the network analysis are listed in the following tables. Tab. 1 Short-circuit conditions on the 110 kV part of substation 110/22 kV S k' 3' max [MVA]

919 Tab. 2 Electrical parameters of network transformer

S n [MVA]

u k 12 [%]

U1 [kV]

U 2 [kV]

25

10,6

110

23

Tab. 3 Rated electrical parameters of transformer 22/0,4 kV (for hydroelectric power plant ) power high voltage low voltage no load losses short circuit lossess no load current short circuit current

630 kVA 22 kV 0,40 kV 1,070 kW 7,2 kW 0,7 % 6%


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line 11 line 12

Tab. 4 Types and lengths of the 22 kV lines branch line 1 line 2 line 3 line 4 line 5 line 6 line 7 line 8 line 9 line 10

conductor 70 AlFe 70 AlFe 70 AlFe 70 AlFe 70 AlFe 70 AlFe 35 AlFe 35 AlFe 42/7 AlFe 42/7 AlFe

length [km] 0,6 0,6 3,1 0,9 0,6 4,5 1,0 0,6 1,2 2,0

25 AlFe 25 AlFe

1,8 3,0

Tab. 5 Electrical parameters of the hydroelectric power plant (HEPP) generator generator type rated power rated voltage current to rand current *)

Asynchronous 2 x 315 kW 400 V 8 *)

According to standard PNE 33 3430-0

Fig. 1 Configuration of electrical network

3 RESULTS OF VOLTAGE LEVELS AND ACTIVE LOSSES ANALYSIS Steady-state calculation was realised under consideration that node signed in Fig. 1 as N 0 is a slack bus. Voltage difference in percent was calculated using the following formula:

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∆u % =

U after connection − U before connection ⋅100 % U before connection

(1)

The following figures show the voltage values in all nodes of 22 kV network and a change of voltage levels after connection of hydroelectric power plant into different nodes.

in electrical nodes situated in a greater distance from the electrical substation ∆u% can exceed a value 2 %.

4 EXAMINATION OF VOLTAGE DIFFERENCE CRITERIA According to [2], in a case when it is only one point of the connection of a dispersed source or some dispersed sources in HV network it is possible the term (2) to exam on the basis a ratio of short-circuit power in the point of connection of a new source(s) SkV to a sum of maximal apparent powers SAmax of all new sourced planned to be connected. This ratio is given by the following formula:

k=

Fig. 2 Voltage in the nodes of 22 kV network

S kV S A max

(3)

If there is only one connection point in HV electrical network the criteria of voltage increasing (2) is fulfilled always when the coefficient k is greater than 50 or the coefficient d is less than 2 %, where S (4) d = A max ⋅100 % S kV Results of values ∆u% and d for the connection of HEPP in nodes 1, 4, 6 according to network in Fig. 1 are presented in the following part. 4.1 Results of „ ∆u % “ calculation

Fig. 3 Voltage change in the nodes of 22 kV network Results displayed in Fig. 2 and listed in Tab. 6 show that increasing of electrical distance of the point of HEPP connection from the electrical substation 110/22 kV in a radial network leads to better voltage profile and to decreasing of active power losses in network. Tab. 6 Active power losses in MW in examined 22 kV network before HEPP HEPP in the HEPP in the HEPP in the connection node No. 1 node No. 4 node No. 6 0,103

0,084

0,083

0,069

Order of nodes according to electrical distance from the electrical substation 110/22 kV is the following: 0, 1, 2, 7, 8, 3, 4, 5, 9, 10, 11, 12, 6. The Fig. 3 shows that a increasing of electrical distance of the point of HEPP connection from the electrical substation leads to increasing of voltage change in network nodes. One of the criterions for giving of the permission for connection of a new dispersed source into a distribution power system is to fulfil the term that increasing of voltage values resulting from the connection of the new dispersed source does not exceed 2 %, it means [2]: ∆u% ≤ 2 % (2) According to mentioned results it is important to note that in practice can occur situation that in the node of connection of a new dispersed source the term ∆u% ≤ 2 % is satisfied but

The calculation of voltage difference was realised for two cases in the network according to Fig. 1: Case A: We take into account the impedance of network feeder and the impedance of network transformer (slack bus on the 110 kV part of substation) Tab. 7 Results for HEPP connected at node 1, 4 and 6 Node 1 4 6

Voltage [kV] 22,805 22,461 22,204

∆u% [%] 0,026 0,317 0,662

Case B: We don`t take into account the impedance of network feeder and the impedance of network transformer (slack bus on the 22 kV part of substation) Tab. 8 Results for HEPP connected at node 1, 4 and 6 Node 1 4 6

Voltage [kV] 21,951 21,590 21,322

∆u% [%] 0,036 0,344 0,713

4.2 Results of coefficient „d“ calculation To calculate the coefficient d for the nodes of HEPP connection the short-circuit powers in the network according to Fig. 4 were determined. Short-circuit powers were calculated for two cases:


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5 SUMMARY The article was focused on the analysis of one of the criteria which is important for the examination of giving the permission for a new dispersed source connection. This criterion is about determination of voltage change in a node of connection of a new dispersed source compared with the state before the connection. Presented results confirmed the validity of the term mentioned in the beginning of the chapter 4. It means that values ∆u% are less than values d for all examined nodes of HEPP connection. The results also show that a value of d considerably depends on a fact if network impedance and an impedance of network transformer are taking into account or not. A value of ∆u% also depends on a selection of slack bus in steady-state calculation but this dependency is not so noticeable. During the examination of fulfilment of the term ∆u% ≤ 2 % it is important to consider not only a value of voltage difference in the node of connection but in all network nodes, because this value is higher in a greater distance from the electrical substation which feeds the examined HV network. ACKNOWLEDGEMENT

This work was supported by Scientific Grant Agency of the Ministry of Education of Slovak Republic and the Slovak Academy of Sciences under the contract No. 1/0166/10 and by Slovak Research and Development Agency under the contract No. APVV-0385-07 and No. SK-BG-0010-08. LITERATURE

Fig. 4 Identification of three-phase short-circuits places Case A: We take into account the impedance of network feeder and the impedance of network transformer Tab. 9 Results for HEPP connected at node 1, 4 and 6 Initial symInitial symShort cirmetrical metrical shortnode cuit impedd [%] short-circuit circuit power ance [ohm] current [kA] [MVA] 1 4 6

2,996 5,276 8,083

4,664 2,648 1,729

177,722 100,902 65,884

0,35 0,62 0,96

Case B: We don`t take into account the impedance of network feeder and the impedance of network transformer Tab. 10 Results for HEPP connected at node 1, 4 and 6 Initial symInitial symShort cirmetrical metrical shortnode cuit impedd [%] short-circuit circuit power ance [ohm] current [kA] [MVA] 1 4 6

0,376 3,219 6,283

37,12 4,341 2,224

1414,453 165,408 84,735

0,044 0,381 0,743

Short-circuit powers were calculated according to methodics presented in [7], [8].

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[1] Przygrodzki, M., Ciura, S.: Distributed Generation Influence on Power Distribution System Development in Poland. In.: 20th International Conference on Electricity Distribution. Prague, 8-11 June 2009. [2] Technické podmienky prevádzkovateľa distribučnej sústavy. Východoslovenská distribučná, a.s., júl 2008. [3] Tůma, J., Rusek, S., Martínek, Z., Chemišinec, I., Goňo, R.: Spolehlivost v elektroenergetice (monograph), CONTE s.r.o., ČVUT Praha 2006, ISBN 80239-6483-6. [4] Hlubeň, D.: Electric energy losses calculation. In: Environmental impacts of power industry 2007. Plzeň: Západočeská univerzita v Plzni, 2007. - ISBN 978-807043-541-0. - P. 50-55. [5] Braciník, P. - Krollová, S.: Predikcia výkonu veternej elektrárne - 1. časť. In:EE : časopis pre elektrotechniku a energetiku. - ISSN 1335-2547. - Roč. 15, č. 2 (2009), s. 21-24. [6] Paar, M., Toman, P.: Distribution network reconfiguration based on minimal power losses. In: Proceedings of the 9th International Scientific Conference EPE 2008: May 13-15, 2008. Brno: University of Technology, 2008. P. 211-214. ISBN 978-80-214-3650-3. [7] Mešter, M.: Výpočet skratových prúdov v trojfázových striedavých sústavách. In.: ABB, s.r.o. Bratislava, 2005. 94s. ISBN 80-89057-10-1. [8] STN EN 60909 0: 04/2003: Skratové prúdy v trojfázových striedavých sústavách. Časť 0: Výpočet prúdov.

Proceedings of the 11 th International Scientific Conference

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