电网不平衡下MMC灵活电流控制方法  

Flexible Current Control of MMC Under Unbalanced Grid Condition

作　　者：殷实[1] 谭国俊[1] 韩韬[1] 方磊[1] 

机构地区：[1]中国矿业大学,江苏徐州221116

出　　处：《电力电子技术》2018年第3期121-124,共4页Power Electronics

基　　金：国家自然科学基金(U1610113);江苏省研究生培养创新工程(KYLX_1380)~~

摘　　要：针对电网不平衡状态下模块化多电平变流器(MMC)传统控制方法功率抖动和三相电流畸变严重等问题,提出一种MMC灵活电流控制方法。以所建立的MMC数学模型为基础,分析发生电网不平衡故障后变流器系统瞬时功率波动产生的根本原因,结合瞬时电导电纳理念,同时引入有功、无功功率调节因子,在线求取不同控制目标所对应的调节因子临界值,实现有功功率振荡抑制、无功功率振荡抑制及三相电流对称等控制目标的在线切换与跟踪。最后,搭建三相MMC实验平台对所提电网不平衡状态下MMC灵活电流控制方法进行实验分析,结果证明了所提控制方法的快速性与有效性。Aiming at the power fluctuation problems of modular multilevel converter（MMC） and three-phase current distortion under unbalanced state of power grid,a flexible current control method for MMC is proposed.Based on the mathematical model of MMC and instantaneous conductance and susceptance concept, instantaneous power fluctuations of converter system are analyzed.Active and reactive power regulating factor are introduced and calculated online to get different control targets.Finally,the experimental platform of three-phase MMC is built and the flexible current control method of MMC under unbalanced state is experimentally analyzed.The results show the rapidity and effectiveness of the proposed control method.

关 键 词：变流器 灵活电流控制 调节因子 

分 类 号：TM46[电气工程—电器]