基于开关组合规律的双有源桥DC-DC变换器传输功率特性

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。

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

The transmission power characteristics of dual-active-bridge (DAB) DC-DC converter is studied in this paper. There are three independent degrees of freedom when DAB is controlled by phase shift modulation. The DAB working status under any combinations of three phase-shifted degrees of freedom is divided into 12 models. The transmission power values of these 12 models are calculated separately. The range of transmission power for each model is derived, and the transmission power characteristics of DAB under triple-phase-shift (TPS) control are analyzed. The TPS control can be simplified 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 of transmission power for four phase-shift control methods are studied respectively, while the flexibility of power transmission is discussed comparatively. The theoretical analysis is verified by the experiments in the end.