相间短路故障条件下级联H桥光伏逆变器的有功功率回流抑制策略  

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

作　　者：林珊 赵涛 农兴中 王春芳 Lin Shan;Zhao Tao;Nong Xingzhong;Wang Chunfang(Guangzhou Metro Design and Research Institute Co.,Ltd.,Guangzhou 510010,China;School of Electrical Engineering,Qingdao University,Qingdao 266071,China)

机构地区：[1]广州地铁设计研究院股份有限公司,广州510010 [2]青岛大学电气工程学院,青岛266071

出　　处：《太阳能学报》2024年第3期470-479,共10页Acta Energiae Solaris Sinica

基　　金：山东省自然科学基金青年基金(ZR2022QE057)。

摘　　要：针对现有零序电压补偿策略无法有效抑制级联H桥光伏并网逆变器在电网不对称故障期间存在有功功率回流的问题,定量分析现有零序电压补偿策略的局限性,提出一种正负序最大最小值谐波零序电压注入控制策略,该策略能有效缩小过调制区域,扩大级联H桥型光伏并网逆变器在相间短路故障条件下的运行范围。实验结果验证了所提出控制策略的有效性和可行性。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 maximumminimum 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.

关 键 词：光伏组件 电压骤降 过压保护 级联H桥 有功功率回流 

分 类 号：TM464[电气工程—电器]