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发明公开
CN110086191A 一种基于限流电抗器的MMC-UPFC的故障渡越方法 无效 - 驳回

一种基于限流电抗器的MMC-UPFC的故障渡越方法
摘要：
本发明公开了一种基于限流电抗器的MMC-UPFC的故障渡越方法，包括：在MMC-UPFC的直流母线上串联限流电抗器；若MMC-UPFC本体外部故障仅造成故障线路的一个串联侧MMC闭锁，则并联侧MMC与另一回线路上没有闭锁的串联侧MMC实现UPFC的功能；若MMC-UPFC本体外部故障造成故障线路的两个串联侧MMC均闭锁或切换到零电压输出模式，则UPFC转入STATCOM模式，继续输出无功功率支撑送端交流母线电压；若MMC-UPFC本体外部故障后故障线路的两个串联侧MMC都不闭锁，则控制串联侧MMC切换成零电压输出模式，UPFC转入STATCOM模式，并联侧MMC输出无功功率，支撑接入点的交流母线电压，解决了MMC-UPFC本体外部故障后，可能引起串、并联侧MMC均会闭锁，UPFC退出运行的问题。
摘要（英）：

The invention discloses a MMC-UPFC fault transit method based on a current limiting reactor. The method comprises steps that a series current limiting reactor is connected in series with a DC bus of the MMC-UPFC; if an external fault of the MMC-UPFC body only causes one series side MMC of a faulty line to be blocked, the parallel side MMC and a series side MMC without blocking on the other returnline realize the function of the UPFC; if the external fault of the MMC-UPFC body causes two series side MMCs of the faulty line to be blocked or switched to a zero voltage output mode, the UPFC is transferred to an STATCOM mode, and the reactive power is continuously outputted to support the AC bus voltage at a sending end; if the two series side MMCs of the faulty line are not blocked after theexternal fault of the MMC-UPFC body, the series side MMC is controlled for switching to a zero voltage output mode, the UPFC is transferred to the STATCOM mode, the parallel side MMC outputs the reactive power, the AC bus voltage of an access point is supported, after solving the external fault of the MMC-UPFC body, problems that the serial and parallel side MMC can be blocked and the UPFC is outof operation can be solved.

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