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Strategies of instantaneous compensation for three-phase four-wire circuits

AuthorsMontaño Asquerino, Juan Carlos ; Salmerón, Patricio
Issue Date2002
PublisherInstitute of Electrical and Electronics Engineers
CitationIEEE Transactions on Power Delivery 17: 1079-1084 (2002)
AbstractWhen the voltage source is not balanced for three-phase four-wire circuits, 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. Finally, simulated and experimental results are obtained to confirm the theoretical properties and show the compensator performance.
Identifiersdoi: 10.1109/TPWRD.2002.803841
issn: 0885-8977
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