重复-模糊PI控制的三电平有源电力滤波器

Three level active power filter based on repetitive fuzzy PI control

摘要:

三电平有源电力滤波器（active power filter，APF）系统在负载不同的情况下，谐波补偿性能的稳定性较差，通过分析三电平APF的基本工作原理，给出了一种重复-模糊PI控制方法。该方法采用瞬时无功功率理论的谐波检测方法，将负载电流中的基波电流分离，然后通过重复-模糊PI控制器控制基波电流与负载电流的误差信号。通过MATLAB/Simulink进行仿真分析，发现相比于重复控制和模糊PI控制方法，重复-模糊PI控制的三电平APF结构在不同频点的跟踪稳定性得到了提升，降低了入网谐波含量，即总谐波失真（total harmonic distortion，THD）。该方法可应用在工商业负载场合，弥补了模糊PI控制和重复控制单独使用时系统性能受负载变化影响的缺点，提高了鲁棒性。

Abstract:

Three level active power filter The stability of harmonic compensation performance of active power filter (APF) system is poor under different loads. By analyzing the basic working principle of three-level APF, a repetitive fuzzy PI control method is given. The composite control method adopted the harmonic detection method of instantaneous reactive power theory to separate the fundamental current in the load current, and then controlled by repetitive fuzzy PI controller error signal between fundamental current and load current. Through MATLAB/Simulink simulation analysis, it is found that compared with repetitive control and fuzzy PI control, the tracking stability of repetitive fuzzy PI control three-level APF structure at different frequency points is improved, the incoming harmonic content is reduced，that is total harmonic distortion (THD). The method can be applied to industrial and commercial loads, makes up for the disadvantage that the system performance is affected by the load change when fuzzy PI control and repetitive control are used alone, and improves the robustness.