CAJ | 학술논문

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。
위해결모괴화다전평변류기용우수요무공보상적단상계통시직류측전압은정문제，문장수선개소료단상모괴화다전평변류기（ Modular multilevel converter ， MMC ）적공작원리。연후통과대MMC 건모，분석료단상MMC내부전압불평형회조성배류，재차기출상제출료기우배류공제적은압방법화MMC자모괴전용적균압방법。재상술균압화은압방법하，실현료MMC보상단상계통적무공공솔，병제출료일충기우T／6적허의삼상법검측단상부재무공전류。최후，통과Matlab／Simulink방진험증료상술공제방법적유효성。
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 .