一种链式STATCOM电容电压的平衡控制方法

A Capacitor Voltage Balancing Control Method of Cascade STATCOM

针对链式静止同步补偿器(STATCOM)直流侧电容电压平衡控制的问题,采用一种基于幅相控制的电容电压平衡控制方法。通过理论分析揭示了参考电压的幅值会影响有功功率在逆变单元之间的分布,其相位则反映了装置无功出力的情况,因此,可在参考电压的基础上叠加与瞬时电流同相位的矢量,通过适当地调节比例控制器,对有功能量进行重新分配,达到直流侧电容电压平衡控制的目的。在链式STATCOM实验平台上进行稳态和动态实验,验证了所提平衡控制方法的有效性和可行性。

Against the DC capacitor voltage balancing control problem in cascade static synchronous compensator （STATCOM）, a capacitor voltage balancing control method based on the amplitude-phase control is adopted.The theo- retical analysis reveals that the amplitude of the reference voltage will affect the active power distribution between the inverter units, and its phase will reflect the devices reactive power generation, so the active power is reallocated to reach the purpose of DC capacitor voltage balancing control by adjusting proportional controller, and superimposing a vector in phase with the instantaneous current on the reference voltage.Steady-state and dynamic experiments on cas- cade STATCOM experimental platform demonstrate that the proposed balancing control method is effective and feasible.