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Short-Circuit Protection Strategy for the Parallel Inverters
Author(s): 
Pages: 89-96
Year: Issue:  2
Journal: Transactions of China Electrotechnical Society

Keyword:  并联逆变器 电流瞬时值 短路 限流 恢复时间;
Abstract: 常用的短路保护方案是正常下的恒压模式和异常下的恒流模式相结合的方案。因并联逆变器各模块参数的差异性,短路消除后退出恒流模式的时间不一致产生较大的环流,尤其在轻载情况下易引起功率倒灌,严重时导致直流电压过电压保护停机。针对该问题,提出利用均值电压和瞬时电流值相结合改进策略,且多台并联逆变器同时在同步信号的上升沿(或下降沿)退出恒流模式进入恒压模式,并抬高起始电压得到快速恢复额定电压。两台400kVA/50Hz的逆变器对比实验结果证明了改进策略的有效性。
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