基于复合型自适应广义积分器三电平APF研究

Research of Three-level APF Based on Composite Self-adaptive Generalized Integrator

电力有源滤波器(active power filter,APF)是消除电网中非线性负载产生的电流谐波的有效手段之一。提出一种在三相静止坐标下的基于自适应理论的复合控制器,复合控制器包括改进的自适应广义积分器和PI控制器。在最大限度利用PI控制器进行谐波电流快速跟踪的同时,采取自适应广义积分器对各次谐波进行稳态无静差跟踪控制。提出的复合控制器与三电平电压空间矢量调相结合,能够消除单PI控制交流变量时所存在的稳态静差问题和改善系统鲁棒性。详细研究了复合控制器的设计方法,并给出了设计参数和系统的稳定性分析。基于MATLAB/Simulink仿真平台,对基于自适应广义积分器的三电平APF控制系统进行了仿真分析,最后通过实验验证了控制方法的正确性和有效性。

Active power filter （APF）is one of effective means to eliminate the current harmonics generated by nonlinear load in grid.This paper proposes a three-phase stationary coordinate composite controller based on self-adaptive theory,consisting of an improved self-adaptive generalized integrator and PI controller.While harmonic current is tracked through the PI controller used to its maximum, the self-adaptive generalized integrator is adopted for steady-state track of sub harmonics without static error.The proposed composite controller,in combination with the phase modulation of the three-level voltage space vector can eliminate the steady-state static error existing with the system using just the PI control of AC variables,and improve system robustness.This paper makes a detailed study of the design method of the composite controller and gives design parameters and system stability analysis.Based on the MATLAB/Simulink simulation platform,a simulation analysis is made of the three-level APF control system based on the self-adaptive generalized integrator.Finally,the experiment verifies the correctness and effectiveness of the control method.