Voltage Harmonics Transfer through Medium Voltage Instrument Transformers

Published by Jarosław ŁUSZCZ, Politechnika Gdańska, Wydział Elektrotechniki I Automatyki Abstract. Voltage transformers are widely used in power quality monitoring systems in medium and high voltage grids. This paper presents accuracy problems related to voltage harmonics transfer through instrument transformers. A simplified lumped-parameters wideband circuit model of the voltage transformer is proposed and verified byContinue reading “Voltage Harmonics Transfer through Medium Voltage Instrument Transformers”

Harmonic Current Impact on Transient Overvoltages during Filter Switching-Off

Published by Yuriy VARETSKY1, Roman PAVLYSHYN2, Michał GAJDZICA1,AGH University of Science and Technology (1), Lviv Polytechnic National University(2) Abstract. This paper focuses on the features of power filter switching-off in industrial power supply systems. The filter switching-off behavior under a large amount of a harmonic current component has been analyzed. The effect of harmonic currentContinue reading “Harmonic Current Impact on Transient Overvoltages during Filter Switching-Off”

Estimation of Voltage and Current Distortions in the Power System Supplying the AC Arc Furnace

Published by Wiesław BROCIEK1, Robert WILANOWICZ2,Warsaw University of Technology (1) , Radom University of Technology (2) Abstract. The paper presents a circuit model of three phase arc arrangement, taking into account the nonlinearity of the arc appearing In the particular phases as well as the windings vector groups of a furnace transformer. This model wasContinue reading “Estimation of Voltage and Current Distortions in the Power System Supplying the AC Arc Furnace”

Power Quality Issues, Solutions and Standards: A Technology Review

Published by P. M. Balasubramaniam1 and S. U. Prabha2*1Department of Electrical and Electronics Engineering, Sri Shakthi Institute of Engineering and Technology, Coimbatore, India2Department of Electrical and Electronics Engineering, Sri Ramakrishna Engineering College, Coimbatore, India *Corresponding author. E-mail: baluanujayen@gmail.com AbstractClassically, the aim of the electric power system is to generate electrical energy and to deliver thisContinue reading “Power Quality Issues, Solutions and Standards: A Technology Review”

Higher Harmonics Compensation in Grid-Connected PWM Converters for Renewable Energy Interface and Active Filtering

Published by Szymon PIASECKI1, Marek JASIŃSKI1, Krzysztof RAFAŁ1, Marek KORZENIEWSKI 2, Aritz MILICUA3, Politechnika Warszawska, Instytut Sterowania i Elektroniki Przemysłowej (1), Politechnika Białostocka, Katedra Energoelektroniki i Napędów Elektrycznych (2), Uniwersytet w Mondragon, Wydział Elektryczny (3) Abstract. The paper presents overview of high-order harmonics compensation methods applied for control of grid-connected converter. Two harmonic compensation methodsContinue reading “Higher Harmonics Compensation in Grid-Connected PWM Converters for Renewable Energy Interface and Active Filtering”

Study of Power Quality Disturbance for Restructuring of Power Systems

Published by Rimjhim Tiwari, Dilip Kumar, International Journal of Engineering and Technical Research (IJETR), ISSN: 2321-0869, Volume-2, Issue-12, December 2014. Abstract— In recent years, the traditional power systems’ structures have been changed, and the concern over power quality has increased due to the new generation of load equipments. This equipments has been fully automated electronically,Continue reading “Study of Power Quality Disturbance for Restructuring of Power Systems”

PQ Monitoring in Selected Networks of Czech Republic

Published by Petr KREJCI1, Pavel SANTARIUS1, Radovan HAJOVSKY1, Richard VELICKA1, Radim CUMPELIK2VSB – Technical University of Ostrava, Czech Republic (1), CEZ, a.s., Czech Republic (2) Abstract. In the paper, the results of the complex monitoring of selected PQ parameters during 12 years will be summarized together with the comparison of the changes of parameters afterContinue reading “PQ Monitoring in Selected Networks of Czech Republic”

The Effect of PWM Frequency on the Effectiveness of Protection Against Electric Shock using Residual Current Devices

Published by Stanisław CZAPP , Gdańsk University of Technology, Faculty of Electrical and Control Engineering Abstract. In the paper spectral analysis of the distorted earth fault currents in circuits with variable speed drives is performed. Effectiveness of protection against electric shock using residual current devices in circuits with variable speed drives for various PWM frequenciesContinue reading “The Effect of PWM Frequency on the Effectiveness of Protection Against Electric Shock using Residual Current Devices”

Investigation of Harmonic Generation from Dimmable LED Lamps

Published by Sohel UDDIN1, Hussain SHAREEF1, Azah MOHAMED1, M A HANNAN1Dept. of Electrical, Electronic & Systems Engineering (1), Universiti Kebangsaan Malaysia (1) Abstract. The purpose of this paper is to investigate harmonic generation from dimmable Light Emitting Diode lamps (LEDs) which are used in residential and commercial applications as an energy efficient lighting systems. ItContinue reading “Investigation of Harmonic Generation from Dimmable LED Lamps”

Customer Data Analysis

Published by Electrotek Concepts, Inc., PQSoft Case Study: Customer Data Analysis, Document ID: PQS1102, Date: March 15, 2011. Abstract: Monitoring is often used to characterize power quality levels at various locations on utility and customer power systems. Field measurements provide a convenient means to characterize power quality problems. This case study summarizes a commercial customer powerContinue reading “Customer Data Analysis”