单相模块化多电平变流器SVG控制方法研究  

Research on control method of signal phase SVG based on modular multilevel converter

作　　者：李凯[1] 郑益慧[1] 姚钢[2] 周荔丹[2] 王昕[1] 

机构地区：[1]上海交通大学电工与电子技术中心,上海200240 [2]上海交通大学电力传输与功率变换控制教育部重点实验室电气工程系,上海200240

出　　处：《电测与仪表》2015年第11期1-5,9,共6页Electrical Measurement & Instrumentation

摘　　要：为解决模块化多电平变流器用于需要无功补偿的单相系统时直流侧电压稳定问题,文章首先介绍了单相模块化多电平变流器(Modular multilevel converter,MMC)的工作原理。然后通过对MMC建模,分析了单相MMC内部电压不平衡会造成环流,在此基础上提出了基于环流控制的稳压方法和MMC子模块电容的均压方法。在上述均压和稳压方法下,实现了MMC补偿单相系统的无功功率,并提出了一种基于T/6的虚拟三相法检测单相负载无功电流。最后,通过Matlab/Simulink仿真验证了上述控制方法的有效性。To solve the DC side voltage balancing problem of MMC-SVG under single phase, this paper first explained the operating principles of Modular Multilevel Converter （MMC）. By building the math models of MMC, the paper analyzed the reason of generating loop current which flowed through MMC. Thus, this paper proposed a voltage balan- cing method based on loop current control and a voltage averaging method to maintain the voltage of every capacitor of MMC. Under the above method, this paper realized the MMC compensate the reactive power of single phase system, and put forward a kind of virtual three-phase method to detect single phase load reactive current based on T/6. Final- ly, the Matlab/Simulink simulation indicated these control methods are reliable.

关 键 词：无功电流检测 直流侧电压平衡 模块化多电平变流器 无功补偿 

分 类 号：TM714.3[电气工程—电力系统及自动化]