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链式静止同步串联补偿器以其模块化、可扩展、高压大容量的特点，在未来电网中应用前景广阔。在介绍静止同步串联补偿器调节电网潮流的原理基础之上，采用了针对链式拓扑的分层控制策略，包括系统级、装置级和模块级的控制。然后，针对链式静止同步串联补偿器常见的IGBT开路故障，提出一种软件故障诊断方法。该方法无需增加额外的测点，可作为常规硬件检测方法的补充和后备方案。最后，仿真验证了静止同步串联补偿器的控制策略和IGBT开路故障软件诊断方法的有效性。

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