基于平衡点计算的无差拍控制在PFC中的应用

Deadbeat Control Based on the Calculation of Balanced Power Point for PFC

传统的PFC控制策略中,输入电流质量与母线电压瞬态响应存在矛盾,因此设计电压环控制参数时只能将二者折中,不能同时取二者的最优指标.通过对PFC电压环和电流环平衡点的计算,可采用无差拍控制方式来消除二次电压纹波对PFC控制器的影响,实现对输入电流的精确控制.实验结果证明,该控制方法可行有效.

For the traditional PFC controller,a compromise is needed considering the contradiction of the input current quality and the transient response of the dc bus voltage in the design of voltage loop control parameters,which results in the non-optimal parameters of double loop PFC controller.The deadbeat control algorithm is designed based on the calculation of balanced power point of voltage loop and current loop at the steady state.The proposed control scheme can eliminate the second-order harmonics effectively and realize the accurate control of input current.The feasibility of the proposed scheme is verified by experimental results.