To accelerate the dynamic response in a dual active bridge converter, feed-forward control can be applied in parallel to the conventional PI controller for closed-loop control. The transformer current thus changes significantly due to the phase shift change. A current spike can appear during load transients, particularly when using multiple phase shift modulation. Effort has been made in the previous literature to implement active compensation between two different steady-state operations to eliminate the transformer current spike; however, this results in a complicated control structure. This letter thus proposes a novel modulation method unifying the transformer current for dual phase shift and triple phase shift modulation to mitigate the transformer current spike when switching among various phase shift controls during load transients. By applying the proposed pulsewidth modulation strategy, the instantaneous value of the transformer current stays the same at the beginning of the switching period even with different steady-state modulation techniques. Also, full-operation-range zero-voltage switching can be realized for the primary side or the secondary side switches by combining with the proposed modulation strategy. An experimental prototype demonstration validates the proposed modulation strategy.

中文翻译：

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在负载瞬态期间在无电流尖峰的多相调制中统一变压器电流

为了加速双有源桥式转换器的动态响应，可以将前馈控制与传统的 PI 控制器并行应用以进行闭环控制。因此，变压器电流由于相移变化而显着变化。在负载瞬变期间会出现电流尖峰，尤其是在使用多相移调制时。以前的文献已经努力在两种不同的稳态操作之间实现主动补偿，以消除变压器电流尖峰；然而，这导致了复杂的控制结构。因此，这封信提出了一种新颖的调制方法，将变压器电流统一用于双相移和三相移调制，以减轻在负载瞬态期间在各种相移控制之间切换时的变压器电流尖峰。通过应用所提出的脉宽调制策略，即使采用不同的稳态调制技术，变压器电流的瞬时值在开关周期开始时也保持不变。此外，结合所提出的调制策略，可以实现原边或副边开关的全工作范围零电压切换。实验原型演示验证了所提出的调制策略。