电网技术2016，Vol.40Issue(9)：2764-2771,8.DOI:10.13335/j.1000-3673.pst.2016.09.026
适用于模块化多电平换流器的环流抑制策略
Circulating Currents Suppressing Strategy for Modular Multilevel Converter
摘要
Abstract
For circulating current issue, combined with structural characteristics of modular multilevel converter (MMC), this paper investigated a novel circulating current suppressing strategy using cross-coupling controlling method. Internal circulating currents in MMC could be separated with double frequency negative-sequence transformation of detected arm currents. As a consequence, the proposed strategy could rapidly suppress MMC circulating current with cross-coupling control scheme, effectively mitigating capacitor voltage fluctuations in sub-modules. By establishing transfer function of circulating current suppression controller (CCSC), cross-coupling circulating current controller was fully analyzed and designed. Stability of the proposed controller was also validated. Finally, a detailed simulation model was built up in PSCAD/EMTDC simulation environment. Effectiveness of cross-coupling circulating current suppression strategy was verified. The strategy can significantly improve stability and operation performance of MMC system.关键词
模块化多电平变流器/环流抑制/交叉耦合/电容电压波动/稳定性分析Key words
modular multilevel converter/circulating currents suppression/cross-coupling/capacitor voltage fluctuation/stability analysis分类
信息技术与安全科学引用本文复制引用
姚骏,赵磊,谭义,尹潇..适用于模块化多电平换流器的环流抑制策略[J].电网技术,2016,40(9):2764-2771,8.基金项目
国家自然科学基金资助项目(51477016)；教育部中央高校基本科研业务费重点项目(106112015CDJZR155516)。 Project Supported by National Natural Science Foundation of China (NSFC)(51477016) （51477016）
the Fundamental Research Funds for the Central Universities (106112015CDJZR155516) （106112015CDJZR155516）
