CAJ | 학술논문

在高压大功率应用场合，模块化多电平换流器(MMC )每个桥臂子模块数量较多，造成其控制系统硬件构成复杂、协调控制困难。文中提出一种适用于大规模 MMC 的模块化结构的分布式控制系统：该控制系统由一个主控制单元和若干个桥臂控制单元构成，每个桥臂控制单元又由若干个阀组控制单元组成，每个阀组控制单元只控制较少数量的子模块。该结构有效降低了主控制单元和桥臂控制单元的控制压力，易于实现与扩展。针对该控制系统，提出一种包含阀组间均压和阀组内均压的新型均压策略。在三相41电平MMC实验样机上对所提出的控制系统及均压策略进行了验证，实验结果证明了所述控制系统的可行性及均压策略的有效性。
재고압대공솔응용장합，모괴화다전평환류기(MMC )매개교비자모괴수량교다，조성기공제계통경건구성복잡、협조공제곤난。문중제출일충괄용우대규모 MMC 적모괴화결구적분포식공제계통：해공제계통유일개주공제단원화약간개교비공제단원구성，매개교비공제단원우유약간개벌조공제단원조성，매개벌조공제단원지공제교소수량적자모괴。해결구유효강저료주공제단원화교비공제단원적공제압력，역우실현여확전。침대해공제계통，제출일충포함벌조간균압화벌조내균압적신형균압책략。재삼상41전평MMC실험양궤상대소제출적공제계통급균압책략진행료험증，실험결과증명료소술공제계통적가행성급균압책략적유효성。
In high-voltage and large-power applications,the number of sub-modules in large-scale modular multilevel converters (MMCs) is huge,which makes the control system hardware design complicated and coordinated control difficult.In order to solve this problem,a control system consisting of one central control unit and several arm control units is proposed.Each arm control unit,in turn,consists of several valve-group control units,each of which j ust controls a few sub-modules.With the tasks of the central control unit and arm control units effectively reduced,the distributed control system is easily implemented and extended.In view of the proposed distributed control system with multiple control units,a new voltage-balancing method is divided into two parts,i.e.the intervalve-group voltage balance and the intravalve-group voltage balance.Finally,a three-phase 41-level MMC prototype is designed to verify the proposed control system and the voltage balancing method.It is shown by experimental results that the proposed control system is feasible and the proposed voltage balancing method is valid.