摘要
首先简要介绍了模块化多电平变换器(MMC)的工作机理;其次针对MMC电容电压平衡问题和环流抑制问题,提出一种基于CPSM调制的改进MMC相间环流抑制和电容电压平衡控制方法;最后,针对MMC-HVDC交流系统不对称故障,设计了基于无差拍控制的分序电流内环控制器和系统外环功率控制器。基于PSCAD/EMTDC电磁暂态仿真软件验证了所提控制策略的正确性和有效性。
In this paper, the working mechanism of modular multilevel converter （MMC） is briefly introduced at first. Second, to deal with the problem of circulating current suppression and capacitor voltage balance of MMC, a new method is proposed to suppress the circulating current and achieve the capacitor voltage balance based on CPSM. Finally, considering the AC asymmetrical fault of MMC-HVDC, a sub-sequence current inner loop controller and an outer loop power controller are designed based on deadbeat control. Using PSCAD/EMTDC, the simulation result verifies the correctness and effectiveness of the proposed control strategy.
作者
董京
刘兆辉
蒋超
DONG Jing LIU Zhaohui JIANG Chao(State Grid Cangzhou Power Supply Company, Cangzhou 061001, China State Grid Wuqiao County Power Supply Company, Wuqiao 061800, China Tianjin Tiandaqiushi Electric PowerHigh Technology Co., Ltd, Tianjin 300384, China)
出处
《电力系统及其自动化学报》
CSCD
北大核心
2017年第2期129-134,共6页
Proceedings of the CSU-EPSA
关键词
MMC
电容电压
环流
不对称故障
无差拍控制
modular multilevel converter （MMC）
capacitor voltage
circulating current
asymmetrical fauh
deadbeat control
