级联型STATCOM直流侧电容电压平衡

在链式STATCOM装置中,直流侧电容相互独立,支撑每个H桥直流侧电压。电容电压的恒定是保证静止无功补偿装置安全稳定运行的前提条件。本文针对静止无功发生器直流侧电容电压的不稳定问题,提出了一种基于载波移相调制的直流侧电容电压平衡控制方法,该方法通过采用PI调节与基于直流电源能量交换相结合的直流侧电容电压的平衡控制方法,有效地提高了STATCOM装置的稳定性。仿真结果验证了所提直流侧电容电压平衡控制策略的有效性与可行性。

Voltage balance of DC capacitor in cascade STATCOM

In cascade STATCOM device, the DC side capacitor are independent of each other, support each H bridge DC side voltage. Capacitor voltage constant is to guarantee safe and stable operation of the static reac-tive compensation device. For DC side capacitor voltage instability problems of static reactive power genera-tor, this paper puts forward a kind of DC side capacitor voltage balance control method based on carrier phase shift modulation, the method by using PI control combined with based on DC power energy exchange of the DC side capacitor voltage balance control method, effectively improve the stability of STATCOM device. The simulation results verify the proposed DC side capacitor voltage balance control strategy is effective and feasi-ble.