双有源桥双向DC-DC变换器的多模式控制

摘要

双有源桥(Dual Active Bridge,DAB)双向DC-DC变换器能够双向传输功率,实现零电压开关(ZVS),且功率密度高,能够很好地应用到电力自动化设备中.文中详细介绍了DAB变换器的三种常见的控制方式,分别是移相控制、单PWM和双PWM控制.针对变换器存在低载运行时环路电流大、零电压开关范围受限制的缺点,提出一种多模式控制,拓宽了零电压开关的范围,降低了电流的有效值和峰值,使变换器效率提高.最后用MATLAB软件进行仿真,验证了方案的可行性.%The dual active bridge bidirectional DC-DC converter has bidirectional power transfer capability,zero-voltage switching and high power density.It can be used in electric automation equipment.This paper introduced three control methods of the DAB converter,phase-shift modulation,single PWM and dual PWM,respectively.A multi-mode scheme is proposed that addresses the problem of high circulating currents at light loads,extends the zero-voltage switching(ZVS) range,reduces rms and peak current,increases the efficiency of the converter.Finally,the feasibility of proposed scheme is verified through the simulation of the MATLAB software.