一种新颖的单PI调节器消除双向有源桥无功功率的方法

摘要

双向有源桥Dual active bridge( DAB)因为其简单的结构,在双向能量转换领域非常适用. 然而,无功功率却是不可回避的问题,无功功率的存在会降低DAB的效率. 文中使用单PI闭环控制器来实现无功功率的消除. 建立了在传统控制策略下,无功功率的模型. 基于理论,分析了变换器在稳定时不同时间段的运行模态,并且利用了平均电流型建立了变换器的小信号模型,利用Matlab软件搭建了仿真平台,仿真实验结果证实了文中采用的方法的正确性.%The dual-active-bridge ( DAB) topology is suited for bidirectional DC-DC conversion because of its simple structure.However, the reactive power which will reduce the efficiency of the DAB converter, can not be ignored.In this paper, a simple control strategy using a single PI feedback-loop is proposed to eliminate the reactive power.Math-ematical model of reactive power is established for the traditional phase shift ( TPS) control.Based on the theoretical analysis, the stable operation mode of converter in different periods is analyzed, and the small signal model of DAB converter is established by using average current source model.Then, a simulation platform is set up using Matlab software.The results of simulation experiment verify the excellent performance of the proposed control method in this paper.