考虑电容电压平衡的混合型MMC调制波分配策略  

Hybrid MMC Modulation Wave Distribution Control Strategy Considering Capacitor Voltage Balance

作　　者：赵静波 李文博 朱鑫要 李东[2] ZHAO Jingbo;LI Wenbo;ZHU Xinyao;LI Dong(Electric Power Research Institute,State Grid Jiangsu Electric Power Co.,Ltd,Nanjing 211103,China;Key Laboratory of Power System Intelligent Dispatch and Control of Ministry of Education(Shandong University),Jinan 250061,China)

机构地区：[1]国网江苏省电力有限公司电力科学研究院,南京211103 [2]电网智能化调度与控制教育部重点实验室(山东大学),济南250061

出　　处：《电力系统及其自动化学报》2024年第6期63-72,共10页Proceedings of the CSU-EPSA

基　　金：国网江苏省电力有限公司科技项目(J2022016)。

摘　　要：针对过调制运行下混合型模块化多电平换流器半桥与全桥子模块之间的电容电压不均衡问题,提出一种桥臂调制波内部动态分配控制方法。首先分析混合型模块化多电平换流器子模块电容电压差异的产生机理;然后提出一种桥臂调制波分配方法,以两种子模块电容周期能量积累差异为控制对象,通过调制波初步分配和限幅环节动态修正调制波在半桥与全桥子模块之间的分配比例,最终生成相应的调制信号;最后,通过仿真与硬件在环实验验证所提策略的有效性。To solve the problem of capacitor voltage imbalance between half-bridge and full-bridge submodules in a hy-brid modular multilevel converter(MMC)under over-modulation,a dynamic modulation wave distribution control method for bridge arm is proposed.First,the generating mechanism of capacitor voltage difference between submodules in the hybrid MMC is analyzed.Then,a modulation wave distribution method for bridge arm is put forward,i.e.,the dif-ference of capacitor energy accumulation between the two types of submodules in one period is taken as the control tar-get,and the modulation wave distribution ratio between half-bridge and full-bridge submodules is dynamically modified by preliminary modulation wave distribution and amplitude-limiting link,thereby generating the corresponding modula-tion signal.Finally,the effectiveness of the proposed strategy was verified by simulations and hardware-in-the-loop ex-periments.

关 键 词：混合型模块化多电平换流器 平均值模型 过调制 电容电压平衡 调制策略 

分 类 号：TM72[电气工程—电力系统及自动化]