桥臂复用型MMC的预充电控制策略  

Pre-charging control strategy of arm multiplexing MMC

作　　者：韩创 王琛[1,2] 王毅[1,2] 董阳[1] HAN Chuang;WANG Chen;WANG Yi;DONG Yang(State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources,North China Electric Power University,Baoding 071003,China;Hebei Key Laboratory of Distributed Energy Storage and Microgrid,North China Electric Power University,Baoding 071003,China)

机构地区：[1]华北电力大学新能源电力系统国家重点实验室,河北保定071003 [2]华北电力大学河北省分布式储能与微网重点实验室,河北保定071003

出　　处：《电力自动化设备》2024年第10期77-84,共8页Electric Power Automation Equipment

基　　金：国家自然科学基金资助项目(52207101);河北省自然科学基金资助项目(E2021502048)。

摘　　要：桥臂复用型模块化多电平换流器(AM-MMC)可以有效减少换流器的体积和重量,其预充电控制策略研究亟待开展。为此,提出了分别适用于交流和直流场景的AM-MMC的预充电控制策略。在交流预充电场景下,通过分析桥臂间子模块电容电压的关系,并考虑子模块电容过压以及桥臂间子模块电容电压不均衡问题,提出一种包含不控充电阶段、可控充电阶段和阻断阶段的三阶段交流预充电控制策略,并提供了限流电阻的计算方法。在直流预充电场景下,推导冲击电流产生的原因,提出了一种基于直流电流的冲击电流抑制策略。基于MATLAB/Simulink的仿真结果表明,所提预充电控制策略可有效实现AM-MMC的平稳启动。The arm multiplexing modular multilevel converter(AM-MMC)can effectively reduce the volume and weight of converter,and its pre-charging control strategy research is urgently needed.For this purpose,a pre-charging control strategy for AM-MMC suitable for AC and DC scenarios is proposed.Under the AC pre-charging scenario,by analyzing the relationship of sub-module capacitance voltage between arms while simultaneously taking into account the problems of sub-module capacitance overvoltage and sub-module capacitance voltage imbalance between arms,a three-stage AC pre-charging control strategy including uncon⁃trolled charging stage,controllable charging stage and blocking stage is proposed,and a current limiting resistance calculation method is provided.Under the DC pre-charging scenario,the reasons of inrush cur⁃rent are deduced,a strategy for suppressing inrush current based on DC current is proposed.The simulative results based on MATLAB/Simulink show that the proposed pre-charging control strategy can effectively realize the smooth start-up of AM-MMC.

关 键 词：模块化多电平换流器 桥臂复用 交流预充电控制 直流预充电控制 限流电阻 

分 类 号：TM46[电气工程—电器]