降低双有源桥DC-DC变换器回流功率的双移相控制策略

为减小双有源桥DC-DC变换器中的回流功率，对双有源桥DC-DC变换器进行数学分析，推导回流功率与传输功率、电压转换比的关系。针对传输功率的大小进行分段优化，得出各范围内的最优移相角，从而提出一种能减小双有源桥DC-DC变换器回流功率的改进双移相控制策略，该策略能在一定传输功率范围内满足软开关条件。在MATLAB/Simulink仿真平台上进行仿真实验，仿真结果表明，与传统的单移相相比，所提出的双移相控制策略能明显降低回流功率，并能在一定的传输功率范围内实现回流功率为零。

A Dual Phase-shift Control Strategy for Reducing Back flow Power of the Dual Active Bridge DC-DC Converter

In order to reduce the backflow power of the dual active bridge (DAB) DC-DC converter， mathematical analysis of dual active bridge DC-DC converter is carried out and the relationship between backflow power and transmission power， voltage conversion ratio is derived. According to the account of transmission power， the optimal shift angle in each range is obtained， and we propose an improved dual phase-shift control strategy which can reduce the backflow power of the dual active bridge DC-DC converter and in a certain transmission power range can satisfy soft switching condition. Simulation is carried out on the MATLAB/Simulink platform. The simulation results show that， compared with the traditional single phase shift (SPS)， the proposed dual phase-shift control strategy can obviously reduce the backflow power and can achieve zero backflow power in a certain transmission power range.