Results 221 to 230 of about 5,441 (256)
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Minimizing the three-phase unbalance in an electric arc furnace
IEEE Transactions on Magnetics, 1989A method is proposed to reduce impedance imbalance in the electrode arms of an arc furnace. Conducting plates or tubes are used to shield the magnetic fields around busbars in order to minimize the mutual inductance. The volume integral equation method is used to calculate bus impedances, current distribution, and eddy current losses.
M. Cao, P.P. Biringer
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A Three-Phase Optimal Power-Flow Algorithm to Mitigate Voltage Unbalance
IEEE Transactions on Power Delivery, 2013This paper describes a new methodology for three-phase electrical system optimization, in which the phase unbalances are to be taken into account. A formulation for the three-phase optimal power-flow solution was developed using the primal-dual interior point method and the three-phase current injection method in rectangular coordinates.
Leandro Ramos Araujo +3 more
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2019 22nd International Conference on Electrical Machines and Systems (ICEMS), 2019
A large number of high-power single-phase electric heating loads, represented by air conditioners entering into domestic consumption is easy to cause asymmetric distribution of three-phase loads in three-phase four-wire power supply system. It is difficult to popularize traditional post-treatment methods for three-phase unbalance problems because of ...
Yanbo Che +4 more
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A large number of high-power single-phase electric heating loads, represented by air conditioners entering into domestic consumption is easy to cause asymmetric distribution of three-phase loads in three-phase four-wire power supply system. It is difficult to popularize traditional post-treatment methods for three-phase unbalance problems because of ...
Yanbo Che +4 more
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2012 IEEE Asia Pacific Conference on Circuits and Systems, 2012
In this paper, a distribution transformer using three-phase to single-phase matrix converter with an AC inductor is proposed to suppress three-phase voltage unbalance. The AC inductor is used for compensation of single-phase power pulsation at any load conditions. Control strategy and simulation results are shown in this paper.
Ryota Mizutani +3 more
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In this paper, a distribution transformer using three-phase to single-phase matrix converter with an AC inductor is proposed to suppress three-phase voltage unbalance. The AC inductor is used for compensation of single-phase power pulsation at any load conditions. Control strategy and simulation results are shown in this paper.
Ryota Mizutani +3 more
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Investigation of line-commutated three-phase converters with impedance unbalance
Proceedings of the 2010 Electric Power Quality and Supply Reliability Conference, 2010Current converters operated in unbalanced electrical three-phase systems will generally work asymmetrically, which causes the appearance of non-characteristic harmonics and therefore higher distortion levels. In this paper unbalances are considered, that are caused by asymmetrical AC-line short-circuit impedances, which are usually a result of ...
M. Weiland, G. Herold, T. Freudenstein
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Study of the apparent load loss unbalance in three-phase transformers
Canadian Conference on Electrical and Computer Engineering, 2005., 2006In a three-phase transformer, the load losses are generally similar between phases, with some small variations due to the proximity of the tank on lateral phases. However, when a three-phase test configuration is used, the measured active losses in each phase are significantly unbalanced and do not reflect the actual losses in each phase.
P. Picher +3 more
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Three-phase active voltage regulator for sag and unbalance compensation
2002 IEEE International Conference on Industrial Technology, 2002. IEEE ICIT '02., 2003Requirements on the power quality of AC sources are becoming more stringent as more voltage-sensitive equipments are being used. Among many power quality issues, voltage unbalance and voltage sags are two serious ones. This paper proposes an active voltage regulator, which is composed of a voltage source fed inverter (VSI) coupled in series with the ...
null Gong Maozhong +3 more
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The influence of grid-connected three-phase inverters on voltage unbalance
IEEE PES General Meeting, 2010The increasing presence of single-phase distributed generators and unbalanced loads in the electric power system may lead to unbalance of the three phase voltages, resulting in increased losses and heating. To decrease this voltage unbalance problem three-phase four-wire inverter-connected distributed generation units may be used.
Bart Meersman +4 more
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Space-vector approach in three-phase unbalance and distortion analysis
2016 17th International Conference on Harmonics and Quality of Power (ICHQP), 2016This paper shows that the space-vector approach is an eminent and powerful tool in three-phase analysis. It is able to manage in a unitary way the sinusoidal, distorted and transient conditions. Its complex Fourier series implements a formal unification between unbalance and distortion; such unification is conceptually significant and leads to ...
SUPERTI FURGA, GABRIO +2 more
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Passive unbalance compensation device for three-phase variable loads
2011 10th International Conference on Environment and Electrical Engineering, 2011This paper describes constitution and design characteristics of a passive unbalance compensator for variable loads in three-phase four-wire industrial installations. Unbalance compensator is integrated by three-phase connections of variable coils and capacitors.
Vicente Leon-Martinez +2 more
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