摘要
双有源桥式变换器(Dual-Active-Bridge,DAB)在宽电压范围输出条件下存在回流功率,增大了功率器件以及磁性元件的损耗,降低变换器的效率.采用三重移相的控制方式可有效减小此回流功率,但是开关器件多工作在硬开关状态,使得开关损耗增大,限制了其开关频率和功率密度的进一步增加.针对此问题,论文以软开关作为约束条件,推导出输出功率及回流功率与桥间移相比及桥内移相比的关系,得到优化的移相控制函数.在实现变换器最小回流功率控制同时,可保证全部开关管的零电压开通.论文通过MATLAB/simulink仿真验证了所提控制策略的有效性.
Dual active bridge(DAB)converters have backflow power over a wide voltage range,which increases losses in power devices and magnetic components and reduces converter efficiency.The three-phase shift control method can effectively reduce the backflow power,but most of the switching devices are in a hard switching state,which increases the switching loss and limits the further increase of the switching frequency and power density.In order to solve this problem,the relationship between the output power of the bridge with soft switching and the loop power,the bridge phase difference and the phase difference is derived.Get optimized phase shift control.The zero voltage of all switches can be connected while implementing the minimum backflow power control of the converter.MATLAB/Simulink simulation verified the effectiveness of the control strategy.
作者
朱自伟
刘宝泉
吕杨蒙
ZHU Zi-wei;LIU Bao-quan;LV Yang-meng(School of Electrical and Control Engineering,Shaanxi University of Science & Technology,Xi′an 710021,China)
出处
《陕西科技大学学报》
CAS
2019年第3期164-169,共6页
Journal of Shaanxi University of Science & Technology
基金
陕西科技大学自然科学预研基金项目(2017QNBJ-06)
