级联型STATCOM直流电压他励控制

Separately Excited Control for the DC-voltage of Cascaded STATCOM

针对级联型静止同步补偿器(STATCOM)直流电压半自励控制时较难实现平衡的问题,提出了3种他励控制的方案,即移相变压器三相不控整流、普通变压器单相脉宽调制(PWM)整流、普通变压器三相功率因数校正(PFC)整流。通过对这3种方案主电路拓扑及其控制方法的分析表明:三相不控整流的主电路最简单,单相PWM整流次之,三相PFC整流最复杂;三相不控整流控制最简单,单相PWM整流的控制相对三相PFC整流也简单,且控制器的采集数据也少;从经济性和控制难度上舍弃了三相PFC整流。最后通过仿真表明:三相不控整流与单相PWM整流都能满足运行要求,除非在四象限运行要求时选用单相PWM整流,其他场合三相不控整流就可以满足要求。

We proposed three ways of separately exited controlled solutions to the problem of difficult balance realization when cascaded STATCOM DC half-exited was controlled. The three ways of solutions include three-phase noncontrolled rectifying by the multi-pulse phase shifting transformer, single-phase PWM rectifying by the simple multi-winding transformer and three-phase PFC rectifier by the simple multi-winding transformer. The analysis of the main topology and control means of this three ways demonstrate that the main circuit of the three phase non-controlled rectifying is the simplest, and the single-phase PWM rectifying and the three PFC rectifying are the most complicated. The controlling of the three-phase non-controlled rectifying is also the simplest, single-phase rectifying is simpler than three-phase PFC rectifying , and the data collected by the single-phase PWM controller are fewer. From the viewpoint of economy and control difficulties, three-phase PFC rectifying is excluded. The simulation resuits indicate that the three-phase non controlled rectifying and the single-phase PWM rectifying can both satisfy the running demands, except that four-quadrant running should choose the single-phase PWM rectifying.