MMC交流侧非全相运行时电气量特性分析  

Analysis of AC-side Electrical Characteristics of MMC in Open-phase Operation

作　　者：刘昕昊 李博通 钟晴 焦新茹 刘森[2] LIU Xinhao;LI Botong;ZHONG Qing;JIAO Xinru;LIU Sen(Key Laboratory of Smart Grid of Ministry of Education,School of Electrical and Information Engineering,Tianjin University,Tianjin 300072,China;Tianjin Cement Industry Design&Research Institute Co.,Ltd,Tianjin 300400,China)

机构地区：[1]天津大学电气自动化与信息工程学院智能电网教育部重点实验室,天津300072 [2]天津水泥工业设计研究院有限公司,天津300400

出　　处：《电力系统及其自动化学报》2021年第9期17-25,31,共10页Proceedings of the CSU-EPSA

基　　金：国家重点研发计划资助项目(2018YFB0904600);国家自然科学基金资助项目(51677125);国家自然科学基金联合基金资助项目(U1866205)。

摘　　要：确定非全相运行对模块化多电平换流器运行特性的影响,不仅是保证模块化多电平换流器安全运行的前提,也是设计新的控制和保护方法的基础。本文首先根据非全相运行时的边界条件得到了模块化多电平换流器交流侧等效序网图;然后,基于得到的序网关系,对工作于不同工作状态的模块化多电平换流器交流侧和直流侧电压、电流的变化情况进行了研究,研究表明,非全相运行不仅将导致模块化多电平换流器换流器交流侧出现过电压、过电流,还将使得直流侧电压、电流出现二倍频波动;最后,在PSCAD软件中搭建了双端柔直系统模型进行了仿真验证。Determining the influences of open-phase operation on the operating characteristics of a modular multilevel converter is not only the premise of ensuring the safe operation,but also the basis for designing new control and protection methods.First,the equivalent sequence network diagram of the modular multilevel converter is obtained according to the boundary conditions of open-phase operation.Then,based on the obtained relationship of sequence network,the voltage and current characteristics on the grid-and DC-side of the modular multilevel converter under different working conditions are studied.Results show that the open-phase operation will not only cause over-voltage and over-current on the AC-side of the converter,but also will cause double-frequency fluctuation to the DC-side voltage and current.Finally,a two-terminal system model is built in PSCAD,and the theoretical analysis is verified through simulations.

关 键 词：模块化多电平换流器 非全相运行 电气特性 

分 类 号：TM773[电气工程—电力系统及自动化]