AN ACTIVE POWER BACKFLOW SUPPRESSION STRATEGY FOR CASCADED H-BRIDGE PHOTOVOLTAIC INVERTER UNDER INTER-PHASE SHORT-CIRCUIT FAULT CONDITIONS
Aiming at the issue that the existing zero-sequence voltage compensation strategy cannot effectively suppress the active power backflow of cascaded H-bridge(CHB)photovoltaic(PV)grid-connected inverters during asymmetric grid faults,the limitations of the existing zero-sequence voltage compensation strategy are quantitatively analyzed,and a positive-negative sequence maximum-minimum harmonic zero-sequence voltage injection control strategy is proposed,which can effectively reduce the overmodulation zone,expand the operation range of CHB PV inverter under inter-phase short-circuit fault condition.Finally,the effectiveness and feasibility of the proposed control strategy are verified by experimental results.
PV modulesvoltage dipsovervoltage protectioncascaded H-bridgeactive power backflow
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维普
