双向全桥DC/DC变换器新型移相控制策略研究

Research on the New Phase Shift Control Strategy of Bi-directional Full-bridge DC/DC Converter

目前双向全桥DC/DC变换器以传统单移相(SPS)控制策略为主,SPS控制策略在电压不对等的情况下可能会产生较严重的回流功率和电流应力。为了提升传输效率,提出一种扩展移相(EPS)控制,该方法既减少了双向全桥DC/DC变换器传输过程中的损耗,也扩展了双向全桥DC/DC变换器的控制范围,增强了调节灵活性。详细了介绍所提EPS控制的原理,分析了EPS控制的软开关控制范围,同时给出了以虚拟功率标幺值为控制目标的控制策略来寻求最优回流功率。

Bi-directional fun-bridge DC/DC converter is dominated by traditional single-phase-shifting（SIXS） control stra- tegy.The SPS control strategy would produce large backflow power and current stress which lead to increasing losses when the voltage is not equal.In order to improve transmission efficiency, an extend-phase-shifting（EPS） control is proposed.This method reduces transmission loss,and expands the control range and enhance the adjustment flexibility when used in the bi-directional full-bridge DC/DC converter.The principle of EPS control is introduced, and the control range of EPS control is analyzed.A new control strategy whose control target is virtual power is given to seek optimal backflow power.