CAJ | 학술논문

模块化多电平换流器(MMC)存在内部环流，文中对其环流进行了简要分析，指出了对之进行抑制的必要性。提出了一种基于直接反馈控制原理的 MMC 新型环流抑制器，该控制器通过陷波器来提取环流中的二次基频分量，并以准比例谐振控制器对子模块调制信号进行补偿，从而达到了限制二次环流的目的。该方法原理简单，易于实现，同时对单相及三相系统均适用。仿真结果验证了所述方案的正确性和可行性。
모괴화다전평환류기(MMC)존재내부배류，문중대기배류진행료간요분석，지출료대지진행억제적필요성。제출료일충기우직접반궤공제원리적 MMC 신형배류억제기，해공제기통과함파기래제취배류중적이차기빈분량，병이준비례해진공제기대자모괴조제신호진행보상，종이체도료한제이차배류적목적。해방법원리간단，역우실현，동시대단상급삼상계통균괄용。방진결과험증료소술방안적정학성화가행성。
The inner circulating current in the modular multilevel converter (MMC) is briefly analyzed and the necessity to restrain it is pointed out.A novel circulating current suppressor (NCCS) for MMC based on the direct feedback control principle is designed.The NCCS adopts notch filters to extract the secondary component in the inner circulating current,and then compensates for it with the modulation signals of sub-modules by the quasi-proportional-resonant (quasi-PR) controller. The proposed method is simple in principle,easy in implementation,and suitable for both single-phase and three-phase power systems.Finally,the correctness and feasibility of the proposed control strategy are verified by simulation results.