CAJ | 학술논문

模块化多电平换流器(MMC)由于自身结构的特点使得三相桥臂存在相间环流,环流的存在使得三相桥臂电流产生谐波,从而导致系统成本增加,损耗增大. 通过分析MMC的基本原理和对MMC控制系统数学模型的推导,设计了一种无锁相环结构的MMC控制系统,该系统既满足了MMC主控制电路设计需求,也能够运用于MMC环流抑制控制器的设计.这种无锁相环结构控制系统的设计,有效地减少了系统的参数选取,同时实现系统有功、无功的独立解耦控制.通过仿真分析,证明了设计的环流抑制控制器的有效性,为MMC系统的稳定运行提供了一种新的思路.
모괴화다전평환류기(MMC)유우자신결구적특점사득삼상교비존재상간배류,배류적존재사득삼상교비전유산생해파,종이도치계통성본증가,손모증대. 통과분석MMC적기본원리화대MMC공제계통수학모형적추도,설계료일충무쇄상배결구적MMC공제계통,해계통기만족료MMC주공제전로설계수구,야능구운용우MMC배류억제공제기적설계.저충무쇄상배결구공제계통적설계,유효지감소료계통적삼수선취,동시실현계통유공、무공적독립해우공제.통과방진분석,증명료설계적배류억제공제기적유효성,위MMC계통적은정운행제공료일충신적사로.
The circulation current is aroused in the three-phase bridge arm due to the structure of modular multilevel converter, which may cause the harmonic wave of three-phase bridge arm current, thus increasing the cost of the system and power loss. Through the analysis of the basic principle of MMC and the mathematical model of MMC control system, this paper designs a kind of MMC control system without phase-locked loop structure, which not only satisfies the MMC main control circuit design, but also may be applied to MMC circulation inhibition of controller design. The control system without phase-locked loop can reduce the system parameter selection effectively, and realize the independent decoupling control of active and reactive power. Simulation analysis verifies the effectiveness of the proposed control strategy and provides a new approach for the stable operation of the MMC system.