Results 211 to 220 of about 2,357 (259)
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2010 IEEE/PES Transmission and Distribution Conference and Exposition: Latin America (T&D-LA), 2010
In this paper, an analysis of the complex voltage unbalance factor (CVUF) in three-phase lines is offered, in order to orientate future experiments in the study of the effects of voltage unbalance. The geometrical loci for constant magnitudes of the CVUF are presented, considering that the angles of the voltages are constant, and considering that the ...
A. L. Ferreira Filho +3 more
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In this paper, an analysis of the complex voltage unbalance factor (CVUF) in three-phase lines is offered, in order to orientate future experiments in the study of the effects of voltage unbalance. The geometrical loci for constant magnitudes of the CVUF are presented, considering that the angles of the voltages are constant, and considering that the ...
A. L. Ferreira Filho +3 more
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Transmission voltage unbalance evaluation
2012 Future of Instrumentation International Workshop (FIIW) Proceedings, 2012This paper presents transmission level voltage unbalance as measured by two different methods across the Tennessee Valley Authority (TVA) Transmission system. It also discusses the recent focus on distribution voltage control. Two national standards mentioning voltage unbalance are discussed as well as TVA's operations and limitations on voltage ...
James B. Rossman +4 more
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Comparison of voltage unbalance factor by line and phase voltage
2005 International Conference on Electrical Machines and Systems, 2005Most of the loads in industrial power distribution systems are balanced and connected to three power systems. However, voltage unbalance is generated at the user's 3-phase 4-wire distribution systems with single & three phase. Voltage unbalance is mainly affected by load system rather than power system. Unbalanced voltage will draws a highly unbalanced
null Jong-Gyeum Kim +3 more
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A solid state unbalance voltage compensator
12th IEEE International Power Electronics Congress, 2010This paper presents a Fast On-Load Tap Changing Regulator used to correct unbalanced voltages. This regulator uses the semi natural commutation in order to improve the response. The proposed topology injects the voltage in only phase in order to balance the three phase system.
Rodolfo Echavarria +2 more
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Voltage unbalance on rural systems
Power Engineering Journal, 1987Unequal voltages or voltage unbalance on rural systems has been a known phenomenon for some time. This article discusses the causes and effects of voltage unbalance and gives a practical solution to the ...
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Voltage unbalance in the multicell converter topology
IEEE AFRICON. 6th Africon Conference in Africa,, 2003The multicell converter topology is said to possess a natural voltage balancing property. This paper models a 2-cell multicell converter. The switching and balancing properties of this converter is mathematically analyzed and presented. The balancing property of this converter is also proven mathematically from the presented properties and conditions ...
R. Wilkinson +2 more
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Quantification of Voltage Unbalance Conditions
2014This paper confers the various effects of voltage unbalance on the performance of three-phase induction motor (3-Φ IM). The need of quantification of the voltage unbalance conditions is asserted to make precise and unique assessment of the performance 3-Φ IM.
Abhishek Chauhan +2 more
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Effect of supply-voltage unbalance on voltage-source inverter
3rd IET International Conference on Power Electronics, Machines and Drives (PEMD 2006), 2006Properties of the control method for the compensation of unbalanced voltage supply that eliminates pulsating current in the DC bus of a voltage source inverter are analyzed. These pulsations can have negative effects on operating properties of the drive as well as on the quality of power supply in the electrical vicinity of the inverter.
M. Chomat, L. Schreier, J. Bendl
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Some Observations on Definitions of Voltage Unbalance
2007 39th North American Power Symposium, 2007In this paper an analysis of five different definitions of voltage unbalance developed by various power communities (CIGRE, NEMA, IEEE, and IEC) is presented, in order to understand their performance and difference among them. The purpose of this work is to analyze and quantify the voltage unbalance, so that these results may become useful to minimize ...
Asheesh K. Singh, G. K. Singh, R. Mitra
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Representing line voltage unbalance
Conference Record of the 2002 IEEE Industry Applications Conference. 37th IAS Annual Meeting (Cat. No.02CH37344), 2003Representing the degree of voltage unbalance with the voltage unbalance factor (VUF) derived from symmetrical transformation requires complex phasor manipulations. This paper investigates various ways of representing VUF to facilitate the calculation in field applications.
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