基于复合控制的并联有源滤波器研究

Research of Shunt Active Power Filter Based on Composite Control

通过分析三相三线制并联有源电力滤波器的电路结构,建立了主电路d-q坐标系下电流环控制的数学模型。针对传统PI控制稳态精度低的缺点,提出将其与重复控制串联的复合控制策略。利用PI控制提高系统的动态响应,利用重复控制对于周期扰动信号无差跟踪的特点提高系统的稳态精度。在负载平衡与不平衡情况下,对复合控制应用于谐波补偿的性能进行了仿真研究。结果表明,在负载平衡与不平衡情况下,复合控制都具有良好的动静态性能,该方法应用于谐波抑制是正确可行的。

The mathematical model of current loop control in d-q reference frame was presented by analy- zing circuit frame of three-phase three-line shunt active power filter. Aiming at the trait of low static precision of PI controller, compound control was presented by putting PI controller and repetitive controller in series. The PI control- ler is used to improve the system dynamic performance and repetitive controller the static follow-up performance by using its trait of zero steady-error to periodic disturbance. In the condition of load balanced and unbalanced, the performance of compound controller apply to harmonic compensation is emulated. The results of simulation show compound controller has good dynamic and static performance in the condition of load balanced and unbalanced, the method apply to harmonic restrain is right and feasible.