低电容用量高纹波MMC的三次谐波电压注入方法  

A third-order harmonic injection method for low-capacitance modularmultilevel converters with high ripples

作　　者：孟经伟 周月宾 张楠 宋强[1] MENG Jing-wei;ZHOU Yue-bin;ZHANG Nan;SONG Qiang(State Key Laboratory of Control and Simulation of Power System and Generation Equipments,Department of Electrical Engineering,Tsinghua University,Beijing 100084,China;State Key Laboratory of HVDC,Electric Power Research Institute,CSG,Guangzhou 510663,China;Maintenance and Test Center of Extra High Voltage Power Transmission Co.,China Southern Power Grid,Guangzhou 510663,China)

机构地区：[1]电力系统及发电设备控制和仿真国家重点实验室,清华大学电机系,北京100084 [2]直流输电技术国家重点实验室,南方电网科学研究院,广东广州510663 [3]中国南方电网有限责任公司超高压输电公司检修试验中心,广东广州510663

出　　处：《电工电能新技术》2021年第2期1-8,共8页Advanced Technology of Electrical Engineering and Energy

基　　金：国家自然科学基金项目(51977119)、南方电网公司科技项目(ZBKJXM20180663)。

摘　　要：针对高纹波模块化多电平换流器(Modular Multilevel Converter,MMC)在感性工况下输出电压能力和功率能力受限问题,对基于三次谐波电压注入的高纹波MMC进行了研究。考虑了MMC电容电压波动的影响,对三次谐波电压注入下MMC电压的输出能力进行了分析,揭示了在不同运行工况下三次谐波注入对MMC最大调制比的提高能力不同。基于感性工况下的调制比可提高程度大于容性工况的特性,提出了高纹波MMC的三次谐波电压注入方法,可弥补感性工况下高纹波运行方式导致的输出电压和无功能力的缺失,将高纹波MMC的输出功率范围扩展到与常规MMC接近,克服了高纹波MMC感性无功输出能力严重受限问题。仿真结果验证了所提方法的有效性。Aiming at the problem of the limitation of inductive reactive power rating of the low-capacitance modular multilevel converters with high ripples(HR-MMCs),the third-order harmonic injection method for HR-MMC is studied.Taking the effect of the capacitor voltage fluctuation into consideration,the influence of the third-order harmonic voltage injection on the output voltage capability is comprehensively analyzed.The different effects of third-order harmonic injection on the maximum modulation ratio under different operating conditions are revealed.Based on the fact that the modulation ratio of inductive operation mode can be improved more than that of capacitive operation mode,a third-order harmonic voltage injection method for HR-MMC is proposed,which can make up for the limitation of the output voltage ability under inductive condition,and extend the output reactive power range to be close to that of conventional MMCs,and overcome the problem of the limitation of inductive reactive power rating.Simulation results verify the effectiveness of the proposed method.

关 键 词：模块化多电平换流器 低电容用量 三次谐波电压注入 

分 类 号：TM72[电气工程—电力系统及自动化]