应用于有源滤波的重复学习控制器参数设计

Design on Parameters of a Repetitive Learning Controller Used in Active Power Filter

针对传统PI控制因带宽不够无法实现对谐波信号无静差跟踪的问题,提出一种基于P型学习控制和重复控制相结合的重复学习控制技术,利用P型学习控制来保证系统的动态性能,利用重复控制对周期扰动信号无静差跟踪的特点来提高有源电力滤波器(APF)对负载谐波电流的稳态跟踪精度。该控制方法结构简单,具有很强的实用性。对三相三线APF的重复学习控制策略参数进行了设计,对控制系统的稳定性、收敛速度及稳态误差进行了理论分析。实验结果验证了所提重复学习控制的有效性和实用性,能有效提高APF的滤波性能。

For conventional PI controller does not have enough bandwidth to track multi-harmonics without static error, this paper proposes a repetitive learning control, combination of P-type learning control and repetitive control.The P- type learning control is used to ensure the system＇s dynamic performance, the repetitive control which can gain no static error for cycle perturbation signal is to improve the output current tracking accuracy of active power filter （APF） for the load harmonic current.This control method is simple ,and has a strong practical use.This paper gives th- eoretical analysis of the stability, the convergence rate and steady-state error of the control system based on three- phase three-wire APF.The simulation and experimental results demonstrate that the proposed repetitive learning control is effective and practical, and can effectively improve the filtering performance of the APF.