输出电压恒定下DAB变换器回流功率优化控制

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DOI：10. 15938/j. emc.2025.04.011

中图分类号：TM46 文献标志码：A 文章编号：1007-449X（2025）04-0110-14

Optimal control of return power in DAB converter under constant output voltage

WANG Qiang1.2， SONG Tonghao’， WANG Haoyu'， CHEN Ao1 （1.CollgeofElectricalEngeringandNewEnergy，ChinaThreeGorgesUniversity，Yichang43OO2，China;2.Hubeirovicial Engineering Research Center of Intellgent Energy Technology，China Three Gorges University，Yichang ，China）

Abstract：Dual active bridge （DAB） converter requires high dynamic performance and high efficiency under constant output voltage conditions such as new energy grid connection and motor controller，but the existence of its return power affects the constant output voltage and brings difficulties to the efficiency improvement of the converter. Firstly，the relationship between the output voltage and the duty cycle of the internal and external phase shifts under the extended phase shift of the converter was analyzed，and the output voltage prediction model of the converter was derived.Then，the optimal control of the return power considering switching loss was embedded in the voltage prediction model，and a model predictive control method was obtained. Accordingly，it is necessary to ensure that the primary return power and switching loss of the converter are reduced while improving the stable and dynamic performance of the system. In addition，a feedback correction method was proposed to improve the control accuracy and enhance the control robustness in the case of parameter mismatch.Finally，the simulation model of the converter was built，and the stable dynamic performance and return power of the converter were compared with different control strategies，and the results show that the predictive control model can beter take into account the constant voltage output and the working efficiency of the converter.

Keywords：constant output voltage; dual active bridge converter； extended phase shifting； model predic-tive control； return power

0引言

具有电气隔离、可实现能量双向流动、能量密度高和易实现软开关等优点的双有源桥式（dualactivebridge，DAB）DC-DC变换器，作为不同系统间能量双向流动和电压匹配的关键组件，已在电动汽车、不间断电源（uninterruptible power supply，UPS）、新能源并网等领域[1-4]被广泛应用。（剩余17120字）