基于递推积分PI的混合型有源电力滤波器电流控制

在采用混合型有源电力滤波器消除谐波时，由于滤波器的检测精度、指令电流计算延时和输出滤波器的相移等因数的影响，滤波效果不够理想，针对被控量是以20ms为周期的电流，文中提出了应用于混合型有源滤波器的递推积分PI控制算法，并且引入了参考电流模糊加权前馈控制。该控制方法有效地提高系统的目标跟随特性、抗干扰性和鲁棒性，并且具有计算量小、容易工程实现的特点，实验结果证明了所提出的控制方法的可行性。所提出的递推积分H控制算法还可以对周期性的被控量实现无静差控制，如交流电机的闭环控制。

RECURSIVE INTEGRAL PI FOR CURRENT CONTROL OF HYBRID ACTIVE POWER FILTER

In the use of hybrid active power filter (HAPF) for eliminating harmonics in the electric power systems, due to the influence of detection accuracy, time delay of instruction current calculation and phase displacement of output filter, the performance of the HAPF system is not good. This paper presents recursive integral PI algorithm applied for HAPF to improve its steady-state and dynamic performance and the control scheme combine fuzzy logic based set-point weighing algorithm to enhance its robustness. The characteristics of the proposed algorithm are small computation capacity and easy for engineering application. Experimental result confirms the validity of the proposed controller. The proposed recursive integral PI algorithm can also be applied in the control of the periodic reference current to obtain a zero steady-state error, as in AC drive.