基于开关组合规律的双有源桥DC-DC变换器传输功率特性

Transmission Power Characteristics of Dual-Active-Bridge DC-DC Converter Based on the Switching Combination Rules

双有源桥DC-DC变换器(DAB)采用移相控制时拥有三个互相独立的移相自由度,通过DAB一次侧、二次侧输出电压的解耦,将三个移相自由度任意组合下的DAB工作状态划分为12个模式。对12个模式的传输功率分别进行计算,推导各模式下传输功率的取值范围,并在此基础上对三重移相控制下DAB的传输功率特性进行研究。通过对三个移相自由度做一些特殊赋值,三重移相控制可以简化为单重移相控制、拓展移相控制和双重移相控制,研究这四种移相控制方法的传输功率范围,并对它们功率传输的灵活性进行比较。最后,通过实验验证了理论分析结果。

The transmission power characteristics of dual-active-bridge(DAB)DC-DC converteris studied in this paper.There are three independent degrees of freedom when DAB is controlled byphase shift modulation.The DAB working status under any combinations of three phase-shifted degreesof freedom is divided into12models.The transmission power values of these12models are calculatedseparately.The range of transmission power for each model is derived,and the transmission powercharacteristics of DAB under triple-phase-shift(TPS)control are analyzed.The TPS control can besimplified as single-phase-shift(SPS)control,extended-phase-shift(EPS)control and dual-phase-shift(DPS)control when some of the degrees of freedom are assigned as special values.The ranges oftransmission power for four phase-shift control methods are studied respectively,while the flexibilityof power transmission is discussed comparatively.The theoretical analysis is verified by theexperiments in the end.