电力系统及其自动化学报2026，Vol.38Issue(5)：11-22,12.DOI:10.19635/j.cnki.csu-epsa.001714
单桥臂复用型MMC单极接地故障穿越及能量均衡策略研究
Research on Pole-to-ground Fault Ride-through and Energy Balance Control Strategy for Single-arm Multiplexing MMC
摘要
Abstract
With the rapid development of high-voltage and high-capacity flexible DC systems,the lightweight design of modular multilevel converters(MMCs)has become increasingly critical.Although the application of arm multiplexing can efficiently achieve the lightweight performance,it still faces the problems of fault ride-through and energy balance,which are even more complex.To address these challenges,the pole-to-ground fault ride-through,which is the most common DC-side fault for a single-arm multiplexing MMC(SMMC),is studied in this paper,followed by the corre-sponding energy balance control strategy.First,based on the topological structure and operation principle,a transient equivalent model is established to analyze the fault characteristics.Then,combined with the single-arm multiplexing feature,a half-wave shift non-blocking fault ride-through strategy is proposed to eliminate the system overvoltage and fault current.Furthermore,aimed at the problem of energy imbalance caused by asymmetric operation during the non-blocking fault ride-through,a dual-modulation energy balance control strategy based on third harmonic injection and commutation angle adjustment is put forward,so as to ensure the capacitor voltage balance under faults while maintain-ing transmission at 50%of the rated power.Simulation results based on a MATLAB/Simulink platform demonstrate that under the proposed strategy,SMMC can realize non-blocking pole-to-ground fault ride-through with a satisfying energy balance effect,effectively enhancing the reliability of power supply.关键词
模块化多电平换流器/轻型化/单极接地故障/半波下移无闭锁故障穿越/桥臂能量均衡Key words
modular multilevel converter(MMC)/lightweight design/pole-to-ground fault/half-wave shift non-block-ing fault ride-through/arm energy balance分类
信息技术与安全科学引用本文复制引用
丁彦如,王毅,高玉华,苏子萌,宋晓宇,吴笑音..单桥臂复用型MMC单极接地故障穿越及能量均衡策略研究[J].电力系统及其自动化学报,2026,38(5):11-22,12.基金项目
国家自然科学基金资助项目(52077079),河北省自然科学基金资助项目(E2021502048). （52077079）
