Results 261 to 270 of about 200,323 (312)
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Estimating the voltage unbalance factor using distribution system state estimation
2010 IEEE PES Innovative Smart Grid Technologies Conference Europe (ISGT Europe), 2010Unbalance is a damaging and costly phenomenon for both network operators and end users. Network operators are increasingly looking at ways in which they can intelligently monitor their exposure to unbalance and its related problems. This paper presents initial results obtained with a new methodology for estimation of the voltage unbalance factor at any
Nick C. Woolley, Jovica V. Milanovic
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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 +4 more
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Calculation Methods of Voltage Unbalance Factor
2023 24th International Middle East Power System Conference (MEPCON), 2023This paper describes seven different methods used for determining voltage unbalance factor (VUF) and comparing them. Voltage unbalance (VU) is a critical phenomenon that can’t be fully mitigated from power networks.
Ahmed M. El-Bashbishi +1 more
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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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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 ...
L. Ladniak
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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
Bhola Jha
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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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Fast correction of voltage unbalance factor in three-phase power system using neural network
2018 11th International Symposium on Mechatronics and its Applications (ISMA), 2018The voltage unbalance at the load terminal of three-phase electric power system is discussed. The aim of this work is to solve the problem of voltage unbalance accurately and quickly by using the Neural Network Control (NNC). In this paper, the Aqaba-Qatrana-South Amman (AQSA) power system is considered and modelled as a real case study.
Jasim A Ghaeb +2 more
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IEEE Transactions on Energy Conversion, 2017
This paper presents a novel centralized positive and negative sequence control strategy for enhancing the unbalanced operation of electric transmission networks. The proposed control strategy is deployed as an effective ancillary service provided by a photovoltaic power plants.
Nada Al Awadhi, Mohamed Shawky El Moursi
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This paper presents a novel centralized positive and negative sequence control strategy for enhancing the unbalanced operation of electric transmission networks. The proposed control strategy is deployed as an effective ancillary service provided by a photovoltaic power plants.
Nada Al Awadhi, Mohamed Shawky El Moursi
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AIP Conference Proceedings, 2017
The amount of small-scaled renewable energy sources is anticipated to increase on the low-voltage distribution networks for the improvement of energy efficiency and reduction of greenhouse gas emission. The growth of the PV systems on the low-voltage distribution networks can create voltage unbalance, voltage rise, and reverse-power flow. Usually these
Jianhui Wong +4 more
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The amount of small-scaled renewable energy sources is anticipated to increase on the low-voltage distribution networks for the improvement of energy efficiency and reduction of greenhouse gas emission. The growth of the PV systems on the low-voltage distribution networks can create voltage unbalance, voltage rise, and reverse-power flow. Usually these
Jianhui Wong +4 more
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