应用于电动汽车充电机的改进无差拍控制器

摘要

针对无差拍电流控制器获取实际参数时存在误差，易随外界因素变化的问题，提出一种改进无差拍控制策略，通过数据比对分析找出电网侧电流总谐波畸变率最小时对应的最优线路电感范围，推导出最优电感和时间常数的关系，通过改变时间常数提高系统应对负载变化的能力，从而提高系统的鲁棒性。仿真结果表明：改进的控制器有较高的稳态精度和良好的动态性能，很好地实现了电动汽车充电机的主要功能。%Because the parameters measurement errors exit in the actual deadbeat current control-ler,and they are easily to change caused by external factors.An improved deadbeat control strat-egy was presented in this paper.By identifying the optimal line inductance corresponding to the minimum total harmonic distortion,the relationship between the optimal inductance and time constantτwas derived.By changing the time constantτ,it is effective to improve the ability of system respond to load change,and system robustness.Simulation results show that the im-proved controller has the higher steady precision and better dynamic performance,which can a-chieve the main function of electric vehicle charger.