一种单相交流充电桩有源滤波器研究

Research on Active Filter of Single-phase AC Charging Pile

目前常见的车载充电机多采用不可控整流实现AC/DC变换,因此造成电网的谐波污染。基于交流充电桩的负载特性分析,设计一种可应用于单相交流充电桩的有源电力滤波器。在此基础上针对传统PI控制器对非阶跃信号存在静差,以及准PR控制器高频段控制精度较差的问题,研究一种改进的双零点PR控制方法,经搭建的样机模型与仿真验证,采用改进的双零点PR控制方法,可有效地抑制车载充电机的谐波电流,提高电网侧电能质量。

The current common car charger use uncontrollable rectifier to achieve AC/DC conversion,which result in harmonic pollution of the grid. Based on the analysis of the load characteristics of the AC charging pile,an active power filter which can be applied to the single-phase AC charging pile was designed. On the basis of the traditional PI controller,there is a static difference between the non-step signal and the poor quasi-PR control in high frequency,the improved double-zero PR control method was proposed. The improved prototype model and simulation verify that the use of improved double zero PR control method can effectively inhibit the car charger harmonic current,and improve the power quality of the grid side.