发表机构
National Laboratory of the Rockies (NLR)（落基山国家实验室）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
针对采用半桥模块化多电平换流器的多端高压直流输电系统，提出主动故障电流限制控制策略及设计方法，可避免换流器闭锁、降低直流断路器分断能力，经PSCAD验证有效。
AI 中文摘要
多端高压直流（MTDC）输电系统的一项关键保护要求是在直流故障期间使用直流断路器（DCCB）选择性隔离故障区域，同时保持系统其余部分运行。然而，在采用半桥模块化多电平换流器（HB-MMC）的MTDC系统中，HB-MMC缺乏固有的故障电流抑制能力，会导致换流器在DCCB清除故障前发生闭锁。本研究提出一种用于HB-MMC的主动故障电流限制（AFCL）控制策略，以缓解直流故障电流，从而避免换流器闭锁并降低DCCB所需的分断能力。此外，还提出一种在换流器和网络稳定性约束下设计AFCL控制策略的系统方法。通过PSCAD在两个典型MTDC系统的直流故障场景中验证了该策略的有效性。
英文摘要
A key protection requirement in multiterminal HVDC (MTDC) transmission systems is to selectively isolate faulted areas using DC circuit breakers (DCCBs) during DC faults while keeping the rest of the systems in operation. However, in MTDC systems using half-bridge modular multilevel converters (HB-MMCs), the lack of inherent fault current suppression capability in HB-MMCs can cause converter blocking before fault clearance by DCCBs. This work presents an active fault current limiting (AFCL) control strategy for HB-MMCs to mitigate DC fault currents, thus avoiding converter blocking and reducing the breaking capability required of DCCBs. In addition, a systematic approach is proposed to design the AFCL control strategy under converter and network stability constraints. The effectiveness of the proposed strategy is demonstrated through PSCAD on two typical MTDC systems during DC faults.
