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首页> 外文期刊>Journal of Modern Power Systems and Clean Energy >Control and protection strategy for MMC MTDC system under converter-side AC fault during converter blocking failure
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Control and protection strategy for MMC MTDC system under converter-side AC fault during converter blocking failure

机译：变流器闭锁期间变流器侧交流故障下MMC MTDC系统的控制和保护策略

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This paper investigates a control and protection strategy for a four-terminal modular multilevel converter (MMC) based high-voltage direct current (HVDC) system under a converter-side AC fault. Based on the system operating condition, a control and protection strategy against the fault with normal blocking of the converter is proposed. In practical, applications encountering such a fault, the MMC at the fault side may experience different conditions of blocking failure. The blocking failures may occur on: ① the whole converter; ② one converter arm; ③ one sub-module (SM)/several SMs of one converter arm; ④ other conditions. The phenomenon of the multi-terminal HVDC (MTDC) system following the fault is analyzed under the first three conditions with real-time simulations using the real-time digital simulator (RTDS). Based on the impact of different conditions on the MTDC system, the necessity of utilizing special control and protection is discussed. A special control and protection strategy is proposed for emergency conditions, and its effectiveness is verified by real-time simulation results.
机译：本文研究了基于四端模块化多电平换流器（MMC）的高压侧直流电（HVDC）系统在换流器侧AC故障下的控制和保护策略。根据系统的运行状况，提出了一种针对变频器正常闭锁的故障控制与保护策略。在实际应用中，遇到此类故障时，故障侧的MMC可能会遇到阻塞故障的不同情况。阻塞故障可能发生在：①整个变频器; ②一个转换臂; ③一个转换臂中的一个子模块（SM）/多个SM; ④其他条件。在故障的前三个条件下，使用实时数字仿真器（RTDS）进行实时仿真，分析了多端子HVDC（MTDC）系统的故障现象。基于不同条件对MTDC系统的影响，讨论了采用特殊控制和保护的必要性。提出了一种针对紧急情况的特殊控制和保护策略，并通过实时仿真结果验证了其有效性。

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