Results 221 to 230 of about 1,336 (261)
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The proposal of a new aggregation time interval for calculating the voltage unbalance factor
Electric Power Systems Research, 2012Abstract When consulting standards that deal with power quality (PQ), it is possible to detect that there are different aggregation time intervals for quantifying voltage unbalance. The choice of the interval to be employed may cause the results of the voltage unbalance factor (VUF) to differ.
João P.J. de Oliveira +2 more
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Proceedings of 14th International Conference on Harmonics and Quality of Power - ICHQP 2010, 2010
This paper presents the main aspects observed in analyzing Complex Voltage Unbalance Factor (CVUF) behavior resulting from the variation of voltage magnitudes and angles. The goal is to identify possible incoherencies regarding the use of the CVUF, and also to investigate whether this factor is more sensitive to variations in magnitude or angles under ...
A. L Ferreira Filho +5 more
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This paper presents the main aspects observed in analyzing Complex Voltage Unbalance Factor (CVUF) behavior resulting from the variation of voltage magnitudes and angles. The goal is to identify possible incoherencies regarding the use of the CVUF, and also to investigate whether this factor is more sensitive to variations in magnitude or angles under ...
A. L Ferreira Filho +5 more
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Approximate Algorithm for Fast Calculating Voltage Unbalance Factor of Three-Phase Power System
IEEE Transactions on Industrial Informatics, 2014The method of calculating voltage unbalance factor (VUF) recommended by the IEC61000-4-27 has the disadvantage of requiring square root operation. This paper focuses on the fast and accurate calculation of VUF of three-phase power system. The approximate algorithm for calculating the magnitude of the zero, positive, and negative sequences by simple ...
He Wen 0003 +4 more
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2008 IEEE/PES Transmission and Distribution Conference and Exposition: Latin America, 2008
The different unbalance definitions applied to three-phase networks are presented shortly, and the unbalance causes and effects on induction motors and ASD are commented. The behavior of an ASD is analyzed when it is fed by an unbalanced voltage centering the attention on the characteristic and non-characteristic harmonic, rms values, K-derating factor,
C. A. Reineri +2 more
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The different unbalance definitions applied to three-phase networks are presented shortly, and the unbalance causes and effects on induction motors and ASD are commented. The behavior of an ASD is analyzed when it is fed by an unbalanced voltage centering the attention on the characteristic and non-characteristic harmonic, rms values, K-derating factor,
C. A. Reineri +2 more
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Calculation of voltage unbalance factor in power system supplying traction transformers
2014 Power Systems Computation Conference, 2014The article presents the models of transformers with specially connected windings for supplying catenary systems of high-speed rail. Using the symmetrical components method and equations describing the relationship between voltages and currents on the primary and secondary sides of the transformer one can derive equations describing the value of the ...
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Evaluation of voltage unbalance factor for the performance analysis of induction motor
2015 39th National Systems Conference (NSC), 2015This paper presents the evaluation of Complex Voltage Unbalance Factor (CVUF) on the performance of Induction motor. The assessment of motor performance in terms of copper losses, core loss, power factor, input power, efficiency, etc. are presented. Results show that the effect of phase angle of CVUF should be taken into account while calculating, core
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Optimal online charging of plug-in electric vehicles considering voltage unbalance factor
2017 IEEE Power & Energy Society General Meeting, 2017The worldwide application and grid-to-vehicle charging of plug-in electric vehicles (PEVs) are expected to tremendously grow within the next few years. Uncoordinated PEV charging in low voltage (LV) distribution networks can lead to local grid problems such as overloading of transformers and voltage unbalances.
Nasim Jabalameli +2 more
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Electric Power Systems Research, 1998
Abstract This paper investigates the effects of different unbalanced voltages with the same voltage unbalance factor (VUF) on the performance of a three-phase induction motor and its feedback influence on the power system. Under eight different voltage unbalance conditions, the performance of a three-phase induction motor was measured through a real ...
null Ching-Yin Lee +3 more
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Abstract This paper investigates the effects of different unbalanced voltages with the same voltage unbalance factor (VUF) on the performance of a three-phase induction motor and its feedback influence on the power system. Under eight different voltage unbalance conditions, the performance of a three-phase induction motor was measured through a real ...
null Ching-Yin Lee +3 more
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Calculation Methods of Voltage Unbalance Factor
2023 24th International Middle East Power System Conference (MEPCON), 2023Ahmed M. El-Bashbishi +1 more
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4th Annual International Power Electronics, Drive Systems and Technologies Conference, 2013
In this paper, a small signal model is proposed for four-switch rectifier with input power factor correction. The required transfer functions are determined and calculated for a typical rectifier. This model is used to design an appropriate controller with defined characteristic to improve the rectifier performance.
Saeed Ouni +2 more
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In this paper, a small signal model is proposed for four-switch rectifier with input power factor correction. The required transfer functions are determined and calculated for a typical rectifier. This model is used to design an appropriate controller with defined characteristic to improve the rectifier performance.
Saeed Ouni +2 more
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