CAJ | 학술논문

为减少子模块开关动作次数和换流器损耗，提出了一种模块化多电平换流器(modular multilevel converter， MMC)的子模块电容电压平衡改进控制方法。采用最近电平调制方式，每个控制周期内按电容电压大小对处于投入状态和切出状态的2组子模块分别进行排序；根据需要投入的子模块数量和当前处于投入状态的子模块数量，对投入和切出的子模块状态进行改变；根据设定的电容电压允许偏差值、可进行调换的子模块数量，对投入和切出的子模块进行对调。仿真算例结果验证了所提方法的有效性。
위감소자모괴개관동작차수화환류기손모，제출료일충모괴화다전평환류기(modular multilevel converter， MMC)적자모괴전용전압평형개진공제방법。채용최근전평조제방식，매개공제주기내안전용전압대소대처우투입상태화절출상태적2조자모괴분별진행배서；근거수요투입적자모괴수량화당전처우투입상태적자모괴수량，대투입화절출적자모괴상태진행개변；근거설정적전용전압윤허편차치、가진행조환적자모괴수량，대투입화절출적자모괴진행대조。방진산례결과험증료소제방법적유효성。
To decrease switching action times of sub-module and reduce converter power dissipation, an improved balance control method for sub-module capacitor voltage of modular multi-level converter (MMC) is proposed. Adopting the nearest level modulation, within each control cycle two sub-modules, which are in switching-on and switching-off conditions, are ordered respectively according to the value of capacitor voltage; based on the number of sub-modules to be put into operation and that being operated at present, the states of switching-on and switching-off sub-modules are changed; according to the preset allowable deviation of capacitor voltage and the number of substitutable sub-modules the sub-modules in switching-on and switching-off states are swapped. The effectiveness of the proposed method is validated by simulation results.