基于PI控制的交流电子负载内环电流控制的改进

Improved inner current control of AC electronic load based on PI control

针对交流电子负载内环电流PI控制存在抗干扰能力差的缺点,在分析交流电子负载的主电路结构及其控制方法的基础上,提出将扰动电压前馈的复合控制方法,在保持内环电流PI控制器跟踪速度的前提下,提高了系统的抗干扰能力,并通过对交流电子负载的建模,按照典型型系统整定方法,确定了PI控制器中参数的大小,仿真表明,该方法能够很好的抑制电压侧带来的扰动,实现交流电子负载负载模拟的功能。

The AC electronic load has the weaknesses of poor anti-disturbance performance when using inner current PI control. This paper analyzes the main circuit structure of AC electronic load and its control method, presenting a combined control method to feed-forward the disturbance voltage. This method keeps the tracking speed of the inner loop current PI controller and improves the anti-interference ability of the system. And then, through the AC electronic load modeling, and according to setting method of typicaltype system, the parameters of PI controller are determined. The research is proved to be effective by simulation.