基于移相控制的双有源桥变换器回流功率分析

Analysis of Reflux Power of Dual Active Bridge Converter Based on Phase-Shift Control

双有源桥DC-DC变换器在传统移相控制方式下存在比较大的回流功率。为减小回流功率,通过分析其产生原因,提出一种基于三重移相控制消除双侧回流功率的控制策略,并推导了变换器的传输功率特性与移相比的关系。该策略使得全桥输出电压与电感电流在整个工作周期内极性相同,消除了回流功率的产生条件。仿真结果验证了理论分析的正确性和控制策略的可行性。

Dual active bridge DC-DC converter has larger reflux power under the traditional phase-shifting control mode.In order to reduce the reflux power,a control strategy based on three heavy phase shift control to eliminate bilateral reflux power was proposed,and the relationship between the transmission power characteristics and the shift of the converter was derived.This strategy made the output voltage and inductance current of the whole bridge within the whole working period,and eliminated the condition of reflux power.The simulation results verified the correctness of the theoretical analysis and the feasibility of the control strategy.