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子模块混合型MMC-HVDC直流故障穿越控制策略

DOI: 10.13334/j.0258-8013.pcsee.2014.30.011, PP. 5343-5351

Keywords: 模块化多电平换流器,高压直流输电,混合子模块,直流短路,故障穿越

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Abstract:

半桥和全桥子模块混合型模块化多电平换流器在具备直流故障穿越能力的同时降低了开关器件的数量。介绍其拓扑结构以及子模块数量的确定方法。阐述半桥和全桥子模块阀段自身平机理和调制电压基本分配原则,并结合最近电平逼近调制提出一种半桥和全桥阀段间平衡的控制策略。分析直流故障期间换流器的等效电路,为了减少暂态期间直流故障电流对子模块电容电压平衡的影响,提出一种基于虚拟电阻的优化控制策略。整个故障穿越期间无需闭锁换流器,且还能持续保证交流系统对无功功率的需求。基于PSCAD/EMTDC,搭建两端子模块混合型模块化多电平换流器HVDC仿真模型,针对双极直流短路工况进行仿真分析,验证了所提出的控制策略的有效性。

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