改进型单周控制单相SAPF的研究

Research of an improved one-cycle controlled single-phase SAPF

针对传统单周控制有源电力滤波器存在的电流直流分量问题和局部不稳定问题,提出一种改进型单相并联有源电力滤波器(Shunt Active Power Filter,SAPF)单周控制策略。建立了单相SAPF的数学模型,在传统单周控制原理及控制方法的基础上,采用引入纹波法,用纹波电流代替网侧电流推导出新的目标控制方程,消除了电网电流直流分量且提高了系统稳定性能。在MATLAB/Simulink仿真环境下分别搭建了传统单周控制和改进的引入纹波法单周控制的单相SAPF仿真模型,结果表明,采用改进型单周控制策略具有良好的抗干扰性、稳定性和鲁棒性。最后设计并调试了一台单相SAPF的实验样机,实验结果证实了改进型单周控制策略的正确性和有效性。

For the problem of current DC offset and local instability in the traditional one-cycle control active power filter, this paper presents an improved one-cycle control strategy to control single-phase shunt active power filter （SAPF）. A mathematical model of single-phase SAPF is established in this paper. Based on the control principle and control method of traditional one-cycle, the current ripple introduction is adopted. A new target control equation is obtained by using the ripple current instead of the grid current, which eliminates, the DC offset of the grid current and improves the stability performance of the system. In the MATLAB/Simulink simulation environment, the traditional one-cycle control SAPF and the improved single-phase SAPF simulation model are introduced. The improved one-cycle control is verified by comparison, which has good anti-jamming, stability and robustness. Finally, the experimental prototype of single-phase SAPF is constructed and regulated. The experimental results show that the improved onecycle control strategy is correct and effective.