基于虚拟电阻的MMC子模块故障容错环流抑制策略  

Circulating current suppressing strategy of modular multilevel converter in sub-module fault-tolerant control mode based on virtual resistor

作　　者：武文[1] 吴学智[1,2] 荆龙 刘京斗[1] 王帅[1] 李金科[1] 

机构地区：[1]北京交通大学国家能源主动配电网技术研发中心,北京100044 [2]北京电动车辆协同创新中心,北京100044

出　　处：《电力自动化设备》2018年第2期161-168,共8页Electric Power Automation Equipment

基　　金：国家重点研发计划资助项目(2016YFB0900505)~~

摘　　要：针对模块化多电平变流器(MMC)子模块故障下容错环流抑制问题,分析了子模块故障状态下的环流特性,进而指出了准比例谐振(PR)控制在子模块故障容错环流控制中的通用优势。通过对采用准PR控制方式的子模块故障容错环流控制器进行分析与改进,提出了一种包含虚拟电阻前馈补偿环节的子模块故障容错环流抑制策略,其在保证实现子模块故障下环流抑制的同时可通过引入的虚拟电阻提高整个控制器的响应速度,使得子模块故障时刻的直流电流以及环流的冲击得到快速、有效的限制,优化了整个系统的性能。仿真与实验结果验证了该环流抑制策略的有效性。Aiming at the problem of circulating current suppressing of MMC （ Modular Multilevel Converter） in sub- module fault-tolerant control mode, the fault characteristics are analyzed, and the advantages of quasi PR （ Proportion Resonance） control for it are pointed out. The circulating current suppressor with quasi PR controller is modified and a fault-tolerant circulating current suppressing strategy with a virtual resistor feedforward compensation is proposed. It ensures the circulating current suppress and improves the response speed of the entire controller hy introdu- cing the virtual resistor,which makes the peak value of the DC and circulating current limited quickly and effectively in periods of sub-module fault. The performance of the entire system is optimized and verified through simulations and experiments to prove the feasibility and effectiveness of the control strategy.

关 键 词：MMC 子模块 虚拟电阻 环流 容错 控制 故障分析 准比例谐振控制 

分 类 号：TM761[电气工程—电力系统及自动化] TM46