Results 221 to 230 of about 2,357 (259)
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Voltage Unbalance Compensation in AC Microgrids
2021Environmental problems of the conventional power generation result in a tendency to increase the use of renewable energy, which in turn has altered the electrical power system. The increasing use of distributed generations over the last decade has led to the concept of Microgrids (MGs). MGs can operate in grid-connected or islanded mode.
Karimi, Shahram +2 more
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Voltage unbalance numerical evaluation and minimization
Electric Power Systems Research, 2009Among a series of parameters, power quality studies are concerned with voltage unbalances, which represent the voltage magnitude and phase deviation from nominal values. In order to determine the influence of the network's parameters on voltage unbalances, and to provide exact solutions to reduce or even eliminate them, the present study develops and ...
Diogo C. Garcia +4 more
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Transpositions and unbalance of high-voltage lines
Electrical Engineering, 1952UNTIL ABOUT 20 years ago, transmission engineers felt that transpositions at fairly close intervals were a necessity on high-voltage lines in order to co-ordinate communication and power systems. However, in many large high-voltage systems, the number of transposition structures has been reduced greatly and the matter of co-ordination has not produced ...
E. T. B. Gross, A. H. Weston
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Voltage unbalance emission assessment
Proceedings of the 2010 Electric Power Quality and Supply Reliability Conference, 2010Aim of this paper is to draw the attention on the principle origin for unbalance, taking into account the part caused by negative sequence currents as well as the part arising from non ideal grid impedance with non negligible coupling impedance between the positive and negative sequence system.
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Voltage unbalance monitoring in CEB systems
10th International Conference on Harmonics and Quality of Power. Proceedings (Cat. No.02EX630), 2004Although the subject power quality has been treated by specialists of the area, it's incipient the number of investigation works referring to voltage unbalance. In this interim, the purpose of this work is to analyze, quantify and qualify the voltage unbalance, so that the results obtained here should be useful not only minimize harmful effects on the ...
M. de Oliveira +3 more
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Discussion of "Assessment of voltage unbalance" [and closure]
IEEE Transactions on Power Delivery, 2002The original paper "Assessment of voltage unbalance" (A. von Jouanne, see ibid., vol.16, p.782-90, 2001) is discussed by the authors in this paper. The original author's response to the paper discussions are also included as closure.
Bansal, R. C. +2 more
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Effects of voltage unbalance on induction motors
Conference Record of the 2004 IEEE International Symposium on Electrical Insulation, 2005This paper investigates the effects of different voltage magnitude unbalances with the same voltage unbalance factor (VUF) on the stator loss and rotor copper loss and total copper loss of three classes of three-phase induction motor. Under six different voltage magnitudes unbalance conditions, the copper losses of three different three-phase induction
A. Siddique, G.S. Yadava, B. Singh
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On the assessment of voltage unbalance
2017The management of voltage unbalance in a power system is supported by the knowledge on the contribution of a single unbalanced load/source to the total level of voltage unbalance observed at a Point of Common Coupling (PCC) in an interconnected power system with unbalanced loads distributed all over.
Seiphetlho, T.E., Rens, A.P.J.
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A new graphic evaluator of the voltage unbalance in power networks
2014 IEEE International Instrumentation and Measurement Technology Conference (I2MTC) Proceedings, 2014Voltage unbalance is a common phenomenon in AC power network. This disturbance can bring to the three-phase induction motors connected to the power supply system important drawbacks such as overheating, drop of efficiency and reduction in output torque.
Aurelian Craciunescu +3 more
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Voltage unbalance emission assessment in radial power systems
2013 IEEE Power & Energy Society General Meeting, 2012Voltage unbalance (VU) emission assessment is an integral part in the VU-management process where loads are allocated a portion of the unbalance absorption capacity of the power system. The International Electrotechnical Commission Report IEC/TR 61000-3-13:2008 prescribes a VU emission allocation methodology establishing the fact that the VU can arise ...
Jayatunga, U, Perera, S, Ciufo, P
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