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Research on control strategy for AC side asymmetric fault of MMC-HVDC transmission system

机译:MMC-HVDC传动系统交流侧不对称故障控制策略研究

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When the Modular Multilevel Converter (MMC) fails on the AC side, the operating characteristics of MMC will be damaged. If the system wants to retain stable for a long time in the process of operation, it is obliged to design the control strategy in case of asymmetric fault. In this article, the control strategy based on feedback linearization principle is adopted to diminish the negative sequence current caused by breakdown, and a DC voltage controller is devised to suppress the fluctuation of the double frequency component under asymmetric fault conditions. The validity of the control strategy requires to be verified, the running results on PSCAD platform indicate this method is effective and feasible.
机译:当模块化多级转换器(MMC)在AC侧发生故障时,MMC的操作特性将损坏。 如果系统在操作过程中长时间保持稳定,则有义务在不对称故障的情况下设计控制策略。 在本文中,采用基于反馈线性化原理的控制策略来减小由击穿引起的负序电流,并且设计了DC电压控制器以抑制不对称故障条件下的双频分量的波动。 控制策略的有效性需要验证,PSCAD平台上的正在运行的结果表明该方法是有效和可行的。

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