基于微分平坦理论的双有源桥式变换器的单移相控制

针对双有源桥式(Dual Active Bridge,DAB)变换器系统受到扰动时动态响应速度慢,基于微分平坦理论,结合单移相控制,提出了一种平坦控制策略。设计DAB变换器平坦控制系统,包括前馈控制和非线性误差反馈控制两部分:前馈控制利用期望输出来规划状态变量轨迹;非线性误差反馈对平坦输出进行校正,消除误差。证明了平坦控制的稳定性,最后在仿真平台上分别对DAB变换器平坦控制和PI控制进行仿真,结果表明:在DAB变换器输出电压给定值改变、输入电压波动以及负载突变时,平坦控制策略下DAB系统可以更快达到输出稳定,系统具有更好的动态性能。

Single-phase-shift control of dual active bridge converter based on differential flatness theory

For the dual active full bridge converter system, the dynamic response speed is slow when the system is disturbed. Based on differential flatness theory and single-phase-shift control, this paper presents a flat control strategy. In this paper, the flat control system of DAB converter is designed, including two parts of feedforward control nonlinear error feedback control: feedforward control uses the desired output to plan the state variable trajectory; nonlinear error feedback corrects flat output and eliminates errors. This paper proves the stability of the flat control. Finally, the DAB converter flat control and PI control are simulated on the simulation platform. The results show that: when the DAB converter output voltage setpoint changes, the input voltage fluctuates and the load changes, Under the flat control strategy, the DAB system can achieve faster output stability and the system has better dynamic performance.