摘要
为了提高双有源桥变换器的效率,针对传统单移相控制时电感电流应力大、回流功率增加等问题,提出了一种基于扩展移相控制的优化控制方法,在轻负载情况下尤为明显。首先,阐述了扩展相移控制方法的原理,通过原边侧桥内移相比及桥间移相比2个自由度改变电感两端电压,控制双有源桥变换器的能量传输;其次,根据自由度大小的不同,分析推导出不同工作模式下电感电流应力及传输功率;再次,为了寻找最优移相比组合,以电感电流应力为优化目标,结合KKT条件得到最优的扩展移相控制策略;最后,通过一台400 W变换器实验平台的搭建,对比传统控制方式,优化后扩展移相的电流应力明显降低,效率显著提高。
To improve the efficiency of dual active bridge(DAB)converters,an optimal control method based on extended phase-shift control is proposed to solve the problems of large inductor current stress and increased return power under the traditional single-phase-shift control,especially under light load conditions.First,the principle of the extended phase-shift control method is elaborated upon in this paper,under which the energy transfer of the DAB converter is controlled by changing the voltage across the inductor through two degrees of freedom of primary-side bridge internal shift and inter-bridge shift.Second,according to the different degrees of freedom,the inductor current stress and transmission power in different working modes are analyzed and deduced.Third,to find the optimal phase-shift combination,the inductor current stress is taken as an optimization objective,and the KKT condition is combined to obtain the optimal extended phase-shift control strategy.Finally,through the construction of a 400 W converter experimental platform,the proposed control method was compared with the traditional control method.It was found that the current stress of the extended phase-shift after optimization was obviously reduced,and the efficiency was significantly improved.
作者
史伟超
张海燕
SHI Weichao;ZHANG Haiyan(School of Electrical Engineering,Shanghai Dianji University,Shanghai 201306,China)
出处
《电源学报》
CSCD
北大核心
2024年第S01期18-24,共7页
Journal of Power Supply
关键词
双有源桥
扩展移相
优化控制
KKT条件
Dual active bridge(DAB)
extended phase-shift
optimal control
KKT condition
