AN ACTIVE POWER BACKFLOW SUPPRESSION STRATEGY FOR CASCADED H-BRIDGE PHOTOVOLTAIC INVERTER UNDER INTER-PHASE SHORT-CIRCUIT FAULT CONDITIONS

Lin Shan; Zhao Tao; Nong Xingzhong; Wang Chunfang

doi:10.19912/j.0254-0096.tynxb.2022-1570

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Acta Energiae Solaris Sinica ›› 2024, Vol. 45 ›› Issue (3) : 470-479. DOI: 10.19912/j.0254-0096.tynxb.2022-1570

AN ACTIVE POWER BACKFLOW SUPPRESSION STRATEGY FOR CASCADED H-BRIDGE PHOTOVOLTAIC INVERTER UNDER INTER-PHASE SHORT-CIRCUIT FAULT CONDITIONS

Lin Shan¹, Zhao Tao², Nong Xingzhong¹, Wang Chunfang²

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Abstract

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.

Key words

PV modules / voltage dips / overvoltage protection / cascaded H-bridge / active power backflow

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Lin Shan, Zhao Tao, Nong Xingzhong, Wang Chunfang. AN ACTIVE POWER BACKFLOW SUPPRESSION STRATEGY FOR CASCADED H-BRIDGE PHOTOVOLTAIC INVERTER UNDER INTER-PHASE SHORT-CIRCUIT FAULT CONDITIONS[J]. Acta Energiae Solaris Sinica. 2024, 45(3): 470-479 https://doi.org/10.19912/j.0254-0096.tynxb.2022-1570

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