Modular Multilevel Converter DC Fault Protection
Modular Multilevel Converter DC Fault Protection
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DOI：
10.1109/tpwrd.2017.2715833
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发表时间：
2018-02
影响因子：
4.4
通讯作者：
O. Cwikowski;H. Wickramasinghe;G. Konstantinou;J. Pou;M. Barnes;R. Shuttleworth
中科院分区：
文献类型：
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作者：
O. Cwikowski;H. Wickramasinghe;G. Konstantinou;J. Pou;M. Barnes;R. Shuttleworth
高压直流（HVDC）电网需要开发直流保护，以提供快速故障隔离并最大限度地减少对现有交流电网的干扰。本文研究了半桥模块化多电平变换器（HB-MMC）的直流故障恢复性能如何受到不同直流保护设计选择的影响。采用详细的换流器和开关装置开关模型，在实时数字仿真器上对采用直流断路器（CB）保护的HB-MMC点对点HVDC系统进行了仿真。直流CB控制器已开发并以软件在环方式实现，并可免费下载。提出了一种新的阻断方案HB-MMC，它限制了预期的直流侧故障电流，有利于直流开关装置。环流控制器的比较表明，标准的d -q控制器很可能是不适合的故障研究。最后，基准测试表明，功率流恢复时间减少48%，断路器中消耗的能量减少90%，沿着其他好处，这取决于保护设计。
High-voltage direct current (HVDC) grids will require the development of dc protections that provide fast fault isolation and minimize the disturbance caused to the existing ac power networks. This paper investigates how the dc fault recovery performance of a half-bridge modular multilevel converter (HB-MMC) is impacted by different dc protection design choices. An HB-MMC point-to-point HVDC system that is protected with dc circuit breakers (CBs) is simulated on a real-time digital simulator using detailed switch models of the converters and switch gear. A dc CB controller has been developed and implemented in a software-in-the-loop fashion, and has been made available free for download. A novel blocking scheme for the HB-MMC is proposed, which limits the prospective dc-side fault current, benefiting dc switch gear. A comparison of circulating current controllers shows that the standard d —q controller is likely to be unsuitable for fault studies. Finally, benchmarking shows that a 48% reduction in power-flow recovery time and a 90% reduction in the energy dissipated in the circuit breaker can be achieved, along with other benefits, depending on the protection design.