电测与仪表2017，Vol.54Issue(2)：38-45,8.
不平衡电网电压下MMC的比例降阶谐振控制策略
Proportional reduced order resonant control strategy for MMC under unbalanced grid voltage conditions
摘要
Abstract
Under unbalanced grid voltage conditions,the power transmission quality of MMC-HVDC (modular multi-level converter-high current direct current) will be significantly affected.To solve this problem,the correlative internal and external characteristics of MMC are analyzed at first in this paper,and it is indicated that the zero-sequence circulating current always exists in MMC under different unbalanced control targets,and the twice fundamental harmonic frequency fluctuation of dc-link voltage and current will be caused when the zero-sequence circulating current flows into dc-side,and then,a control system of MMC under unbalance conditions is built in α-β coordinate system.Both the internal current-loop controller and the circulating current suppressing controller are designed based on proportional reduced-order resonant (P-ROR) regulator.It is verified that the proposed strategy is very effective with the simulation results关键词
模块化多电平换流器/高压直流输电/电网电压不平衡/零序环流/比例降阶谐振调节器Key words
Keywords : modular multilevel converter (MMC)/high voltage direct current (HVDC)/unbalance grid voltage/zero sequence circulating current/proportional reduced-order resonant (P-ROR) regulator分类
信息技术与安全科学引用本文复制引用
宋平岗,吴继珍,邹欢..不平衡电网电压下MMC的比例降阶谐振控制策略[J].电测与仪表,2017,54(2):38-45,8.基金项目
国家自然科学基金资助项目(51367008) （51367008）
