抑制DAB变换器回流功率的双重移相调制策略

双有源桥(Dual Active Bridge, DAB)变换器在传统双重移相(Dual Phase Shift, DPS)调制下，变压器两侧电压不匹配时，中小功率区域内回流功率较大。针对以上问题，提出一种抑制回流功率的双重移相(Dual Phase Shift for Reactive Power Suppression, DPS-RPS)调制策略。首先对DPS-RPS调制的工作原理进行分析并建立数学模型，基于该模型对电流应力进行优化。然后在电流应力最小化条件下分别对DPS调制和DPS-RPS调制的回流功率及电流应力大小进行对比。结果表明，相比较于DPS调制，DPS-RPS调制在中小功率区域内减小了回流功率的同时降低了电流应力。最后通过实验验证了所提DPS-RPS调制的可行性及有效性。

Dual phase shift modulation strategy for reactive power suppression of a DAB converter

There is a problem in that reactive power is large in the medium and low power range when the voltage on two sides of the transformer is mismatched under the traditional dual phase shift (DPS) modulation of a dual active bridge (DAB) converter. Thus a dual phase shift (DPS-RPS) modulation strategy is proposed to suppress the reactive power. First, the working principle of DPS-RPS modulation strategy is analyzed and a mathematical model is established. Based on the model, the current stress is optimized. Then the reactive power and current stress of DPS and DPS-RPS modulation are compared for when the current stress is at a minimum. The results show that compared with DPS modulation, DPS-RPS modulation not only decreases the reactive power, but also reduces the current stress in the medium and low power range. Finally, the feasibility and effectiveness of the proposed DPS-RPS modulation are verified by experiment. This work is supported by the National Natural Science Foundation of China (No. 61901006).