三电平有源电力滤波器的补偿控制

The Compensation Controlling of Three-level Active Power Filter

以三相整流桥负载为谐波源,选用一种简化的空间矢量脉宽调制(SVPWM)算法弥补传统的SVPWM算法计算量大、数字化实现不利的缺陷,经仿真验证可基本实现对谐波电流的补偿,但同时发现整流型负载存在换相点处补偿不足的问题。针对该问题提出采用PI+重复的复合控制策略,并对其中关键参数的选取进行了阐述。仿真结果表明,该方法解决了换相点处补偿不足的问题,且具有更好的总体及单次谐波补偿效果,最终实验结果也验证了所选调制方法和控制策略的有效性。

Taking three-phase rectifier bridge load as the harmonic source, a simplified space vector pulse width mod-ulation（SVPWM） method is selected to make up for the large amount of calculation and digital implementation defectin traditional SVPWM method, and it is verified by the simulation that the simplified SVPWM method can realize thecompensation of harmonic current, but at the same time the problem of insufficient compensation at the commutationpoint is found for the type of rectifier load.Aiming to this problem, the PI＋repetitive compound control strategy is pro-posed, and the selection of key parameters for the control strategy is also described, the simulation results show thatthe insufficient compensation problem at commutation point is solved, and this control strategy has better overall andsingle harmonic compensation effect.Finally,the results also demonstrate the effectiveness of the chosen modulationmethod and the proposed control strategy.