引用本文: | 李爽,王志新,吴杰.采用基频零序分量注入的MMC换流器故障容错控制研究[J].电力系统保护与控制,2014,42(17):1-7.[点击复制] |
LI Shuang,WANG Zhi-xin,WU Jie.Study on fault-tolerant operation control strategyof modular multilevel converters injected with fundamental-frequency zero-sequence voltage component[J].Power System Protection and Control,2014,42(17):1-7[点击复制] |
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摘要: |
针对模块化多电平变流器(Modular multilevel converter, MMC)冗余子模块在故障时存在耗尽的情况,提出了基频零序分量注入的故障容错控制方法。通过与中性点偏移相结合,保证即使出现冗余子模块耗尽,MMC仍能继续安全运行,解决剩余正常子模块承受应力不均衡问题,保障系统安全、可靠运行。同时,利于减少冗余备份量,并大幅度降低硬件成本和提高运行可靠性。经Matlab仿真验证了所提方法的正确性和有效性,为基于MMC的海上风电柔性直流输电变流器的可靠运行提供了一种有效的故障控制方案。 |
关键词: 模块化多电平变流器 故障容错运行 零序电压注入 海上风电 VSC-HVDC |
DOI: |
投稿时间:2013-12-01修订日期:2014-02-26 |
基金项目:国家自然科学基金项目(51377105);国家863计划智能电网关键技术重大项目(2011AA05A103)资助 |
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Study on fault-tolerant operation control strategyof modular multilevel converters injected with fundamental-frequency zero-sequence voltage component |
LI Shuang,WANG Zhi-xin,WU Jie |
(School of Electronic Information and Electrical Engineering, Shanghai Jiao Tong University,
Shanghai 200240, China; Shanghai Waigaoqiao Shipbuilding Co., Ltd., Shanghai 200137, China) |
Abstract: |
In order to fully implement the functionalities of modular multilevel converter (MMC), its fault-tolerant operation without redundant sub-modules (SMs) is comprehensively investigated. To avoid completely shut down the MMC system under SMs fault, a fundamental-frequency zero-sequence injection based neutral-shift method is adopted to enable the fail-safe energy transfer. This approach enhances both the reliability and availability of MMC while avoiding the undesired unbalanced stresses among the healthy SMs. Rigorous simulation studies are performed to demonstrate the validity and effectiveness of the proposed control methods. |
Key words: modular multilevel converter (MMC) fault-tolerant operation zero-sequence voltage injection offshore wind power voltage source converter high-voltage direct-current (VSC-HVDC) |