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级联H桥光伏并网逆变器在相间短路故障下的有功功率回流抑制优化策略

An Optimized Active Power Backflow Suppression Strategy for Cascaded H-Bridge PV Grid-Connected Inverter During Inter-Phase Short-Circuit Fault

语言:

中文摘要

针对三相隔离级联H桥(CHB)光伏逆变器在非对称电网故障下出现有功功率回流,导致直流母线电压失控及系统脱网的问题,本文提出了一种优化抑制策略。该方法有效解决了单相短路及相间短路故障下的功率回流难题,确保了逆变器在复杂电网故障下的稳定运行与低电压穿越能力。

English Abstract

Active power backflow is a unique problem of three-phase isolated cascaded H-bridge (CHB) PV inverter during asymmetric grid voltage fault, resulting in the continuous rise of H-bridge dc-bus voltages and that the inverter will be eventually shut down and off-grid due to voltage out of control. The existing methods are able to completely suppress the active power backflow during single-phase short...
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SunView 深度解读

该研究针对级联H桥(CHB)拓扑在复杂电网故障下的稳定性问题,对于阳光电源的大型地面光伏电站解决方案具有重要参考价值。阳光电源的集中式及组串式逆变器在面对弱电网或复杂故障工况时,对直流侧电压的稳定性要求极高。该策略可优化逆变器在非对称故障下的控制逻辑,提升产品在极端工况下的低电压穿越(LVRT)性能,减少因直流母线过压导致的非必要停机,从而提升电站的发电可靠性和电网适应性。