单相有源电力滤波器的非线性切换控制

摘要

针对线性控制策略造成的有源电力滤波器( Active Power Filter,APF)补偿误差,利用非线性动力学的切换系统理论,提出了一种APF切换控制的新方法.首先建立APF切换系统精确模型,然后利用APF平衡状态推导出APF切换系统误差模型,在此基础上设计合理的切换路径作为系统的控制输入.该输入可以使系统渐近稳定,系统的误差状态变量趋于零,实现APF精确补偿.通过与传统线性电压控制策略进行仿真比较,结果验证了该方法的合理性和有效性.%In view of the compensation error of Active Power Filter (APF) due to the traditional linear control strategy, a novel control approach of APF is proposed by using the switched system theory of nonlinear dynamics. Firstly, the accurate model of switched system of APF is established. On this basis, a switched system error model is established using APF balance state. After that, a reasonable switched path is designed as the system control input. The proposed approach ensures the error converges to zero and the compensation current tracks the reference accurately. Finally, by comparing with the traditional control strategy, the effectiveness and rationality of the approach proposed are shown by the simulation and comparison.