Operating DC Circuit Breakers With MMC
Operating DC Circuit Breakers With MMC
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DOI：
10.1109/tpwrd.2017.2658540
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发表时间：
2018-02
影响因子：
4.4
通讯作者：
O. Cwikowski;A. Wood;Allan Miller;M. Barnes;R. Shuttleworth
中科院分区：
文献类型：
--
作者：
O. Cwikowski;A. Wood;Allan Miller;M. Barnes;R. Shuttleworth
高压直流（HVDC）电网可以通过应用HVDC断路器来保护免受直流故障。直流断路器技术的最新进展可以允许直流电网中的故障被清除，而不会永久性地损失到所连接的交流电网的功率。保护的要求尚未完全定义;特别是在半桥模块化多电平转换器（MMC）控制方面。本文研究了集成直流断路器与半桥MMC转换器，特别是着眼于如何从极到极故障恢复。深入分析了变换器对故障的故障响应。该分析突出了转换器对直流故障响应的关键阶段，从而可以预测MMC故障电流。PSCAD仿真验证了该分析，并显示了功率流恢复。转换器控制进行了调查，改进的功率流恢复，并强调需要臂电流控制器。
High voltage direct current (HVDC) grids may be protected from dc faults through the application of HVDC circuit breakers. Recent advances in dc circuit breaker technologies may allow faults in the dc grid to be cleared without a permanent loss of power to the connected ac grids. The requirements for the protection have yet to be fully defined; especially where half-bridge modular multilevel converter (MMC) controls are concerned. This paper investigates integrating dc circuit breakers with half-bridge MMC converters, specifically looking to at how to recover from a pole-to-pole fault. The fault response of the converter to a fault is analyzed in depth. This analysis highlights key stages in the converter response to a dc fault, allowing the MMC fault currents to be predicted. This analysis is then verified in PSCAD simulations and the power flow recovery is shown. The converter controls are investigated, improvements made to the power flow recovery, and the need for arm current controllers highlighted.