双有源桥DC-DC变换器三重移相优化控制策略

Triple Phase Shift Optimization Control Strategy of Dual Active Bridge DC-DC Converter

为了减小双有源桥DC-DC变换器的电流应力和增强其动态性能,提出一种优化的三重移相控制策略(OTPS),推导了TPS控制下变换器的传输功率模型,以电感电流有效值最小为优化目标,结合开关管软开关条件,应用拉格朗日极值法求解得到了最优的移相比,优化了TPS控制策略,实现漏感电流有效值最小且动态响应时间最短。仿真和实验结果验证了所提出的控制策略的有效性。

In order to reduce the current stress and enhance the dynamic performance of the dual active bridge DC-DC converter,an optimized triple phase shift(OTPS)control strategy is proposed,and the transmission power model of the converter under the TPS control is derived.Taking the minimum effective value of the inductor current as the optimization objective,combined with the soft switching condition of the switch tube,the Lagrange extremum method is used to solve the optimal shift ratio,and the TPS control strategy is optimized to realize the minimum effective value of the leakage inductance current and the shortest dynamic response time.Simulation and experimental results verify the effectiveness of the proposed control strategy.