APF直流侧电压自适应PI控制

Adaptive PI Control of DC Side Voltage of APF

三相三线制有源滤波器(APF)大多采用传统的PI控制策略来控制直流侧的电容电压。为了提高有源滤波器的性能指标,在传统的PI控制基础上,结合最小隶属度模糊控制理论,提出模糊PI的直流侧电压自适应控制。模糊PI控制可以根据实时情况改变比例和积分参数,解决了传统PI控制器在非线性系统中的缺点。MATLAB仿真表明,模糊PI自适应控制与传统PI控制相比,跟踪性能更强,直流侧电压超调量更低,动态性能更好,并且有效地降低了电网谐波的畸变量。

Most of three-phase three-wire active power filters(APF)currently use conventional PI strategy to control capacitor voltage on DC side.Aiming at improving performance of active power filters,the present work studied an fuzzy PI-based adaptive control method by combining conventional PI control strategy with minimum membership fuzzy control theory.Fuzzy PI control can change the proportional and integral parameters according to real-time environment,which surmounts the shortcomings of conventional PI controller in nonlinear systems.It was verified through MATLAB simulation that fuzzy PI-based adaptive control has stronger tracking performance,lower DC side voltage overshoot,and better dynamic performance compared to traditional PI control,and effectively reduces the distortion of power grid harmonics.