CAJ | 학술논문

模块化多电平换流器(modular multilevel converter，MMC)作为高压直流输电的新型拓扑，其内部环流直接影响其正常工作特性。为抑制 MMC 内部的三相环流，结合以往对环流的分析与结论，针对环流的交流分量，设计基于比例谐振(proportional resonant，PR)调节器的环流抑制器，并提出基于二阶广义积分器(second-order generalized integrator，SOGI)和直流积分器相互配合的交流环流提取方法。该抑制器无需负序坐标变换和相间解耦环节，适用于任意相数的MMC控制。搭建包含该抑制器的MMC-HVDC仿真模型，仿真结果表明，该方法能有效地抑制MMC内部环流，并确保MMC正常工作。
모괴화다전평환류기(modular multilevel converter，MMC)작위고압직류수전적신형탁복，기내부배류직접영향기정상공작특성。위억제 MMC 내부적삼상배류，결합이왕대배류적분석여결론，침대배류적교류분량，설계기우비례해진(proportional resonant，PR)조절기적배류억제기，병제출기우이계엄의적분기(second-order generalized integrator，SOGI)화직류적분기상호배합적교류배류제취방법。해억제기무수부서좌표변환화상간해우배절，괄용우임의상수적MMC공제。탑건포함해억제기적MMC-HVDC방진모형，방진결과표명，해방법능유효지억제MMC내부배류，병학보MMC정상공작。
Modular multilevel converter is a new topology in HVDC, the inner circulating current directly affects its performance. In order to suppress three-phase circulating current in MMC, combining with analysis and conclusion in the past, and according to the alternating component of circulating current, circulating current suppressing controller based on PR regulator is designed and the method of extracting alternating component of circulating current through SOGI and DC integrator is proposed. In this strategy, there is no need for the second-order negative-sequence coordination transformation and the phase decoupling control and it is suitable for arbitrary number-phase MMC control. The simulation results based on the established MMC-HVDC simulation model with the suppressor show that this method can suppress the inner circulating current of MMC effectively and ensure normal operation of MMC.