Strategies of Instantaneous Compensation for Three-Phase Four-Wire Circuits

For three-phase four-wire circuits, when the voltage source is not balanced, instantaneous compensation for the instantaneous reactive power does not eliminate the neutral current on the source side. In fact, when the zero-phase voltage of the source exists, none of the present compensation strategi...

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Bibliographic Details
Published in:IEEE power engineering review 2002-06, Vol.22 (6), p.63-63
Main Authors: Montano, J. C., Revuelta, P. Salmeron
Format: Article
Language:English
Subjects:
Active filters
Automatic voltage control
Capacitors
Circuits
Compensation
Compensators
current control
Electric potential
Flexibility
instantaneous active and reactive current
Neutral currents
Power quality
power system control
Power system harmonics
Pulse width modulation
Reactive power
reactive power control
Space vector pulse width modulation
Strategy
three-phase systems
Transient analysis
Voltage
Voltage control
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Summary:For three-phase four-wire circuits, when the voltage source is not balanced, instantaneous compensation for the instantaneous reactive power does not eliminate the neutral current on the source side. In fact, when the zero-phase voltage of the source exists, none of the present compensation strategies can guarantee the instantaneous elimination of the neutral current in three-phase four-wire systems. Two approaches are distinguished in this paper for instantaneous compensation. The first eliminates the instantaneous reactive current, thus neutral current can still flow. The second eliminates the instantaneous pseudo-reactive current, so that the neutral current component is compensated. In the latter case, a new control strategy is designed to avoid instantaneous power flowing through the compensator. It provides flexibility in compensating for the neutral current in a three-phase four-wire system including the zero-sequence voltage. Simulated and experimental results are obtained to confirm the theoretical properties and show the compensator performance.
ISSN:0272-1724
1558-1705
DOI:10.1109/MPER.2002.4312317