摘要
主要研究了模块化多电平交流器(MMC)在电网三相不平衡条件下的控制策略。建立MMC数学模型,分析在不平衡电网下瞬时功率脉动;采用比例-积分降阶谐振(PI-ROR)控制器,无需对电流正负分离,实现对MMC多目标的不平衡控制,在此基础上依然通过ROR控制器进行不平衡电网下MMC环流抑制。最后利用实验对所提控制算法进行了验证,实验结果证明了其可行性。
Control strategy of modular multilevel converter（MMC） under unbalanced grid voltage is presented.The pul- sation of instantaneous power is analyzed based on the mathematical model of MMC.Then with the proportional-integral plus reduced order resonant （PI-ROR） controller, the multi-target unbalanced control of MMC is realized without the positive and negative sequence separation.By the ROB controller,the circulating current is also suppressed.Finally, utilizing the three-phase experimental prototype ,the proposed control system is verified.The experimental results prove the feasibility of the control system.
出处
《电力电子技术》
CSCD
北大核心
2017年第4期34-37,共4页
Power Electronics
基金
国家电网公司科技项目(SGGSJC00FCJS1500144)~~
