多输入双向全桥DC-DC变换器及其能量管理策略研究

Research on multi-input bi-directional full-bridge DC-DC converter and its energy management strategy

在直流微网中,大量储能单元需要通过双向DC-DC变换器接入系统。为简化系统结构,本文在双有源桥式变换器的基础上设计了一款新颖的多输入双向DC-DC变换器。同时基于双重移相控制,通过对变换器回流功率进行分析,得出了回流功率与输入电压以及传输功率的数学模型,据此提出了一种能降低小功率运行状态下回流功率的能量管理策略,实现了在合理分配各储能单元出力的同时提升变换器效率。最后通过一个300W的实验样机验证了设计方案的可行性和控制策略的优越性。

In the DC micro grid,a large number of energy storage units need to be connected to the system through bi-directional dc-dc converter.In order to simplify the system structure,a novel multi-input bi-directional dc-dc converter is designed on the basis of double active bridge converter.At the same time,based on the dual phase shift control,the mathematical model of backflow power,input voltage and transmitted power is obtained by analyzing the backflow power of the converter.Based on this,an energy management strategy which can reduce the backflow power under the condition of low power operation is proposed,which can reasonably allocate the output of each energy storage unit and improve the efficiency of the converter.Finally,a 300W experimental prototype verifies the feasibility of the design scheme and the superiority of the control strategy.