Ultrawide voltage regulation is required in dc/dc converters interfacing battery energy storage systems (BESSs) and electric vehicle (EV) batteries in dc fast-charging stations with energy storage. Attaining high efficiency of this converter can be challenging due to the wide variation of input and output voltage yet is important due to the high power transfer. This article proposes a novel control strategy for the semi-dual active bridge (DAB) converter to achieve wide voltage gain while increasing the efficiency at operational points with high input voltage and low output voltage, which is a commonly occurring scenario when the BESS is fully charged, and the EV battery is at low charge. Furthermore, this article also provides an algorithm to determine the required phase shift in real time for any operating point, eliminating the need to devise the control trajectory offline. A 550-V, 10-kW experimental prototype is built and tested to validate the proposed control strategy. With a 25-A constant charging current, the prototype shows that the proposed control strategy can improve efficiency by up to 3.5% compared to the well-known dual phase shift control at operating points with high input voltage (450–550 V) and low output voltage (150–275 V), with a peak efficiency of 97.6%.

中文翻译：

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电池储能快速充电站中宽电压增益半双有源桥 DC/DC 变换器的优化控制


连接直流快速充电站中的电池储能系统 (BESS) 和电动汽车 (EV) 电池的 DC/DC 转换器需要超宽电压调节。由于输入和输出电压变化很大，实现该转换器的高效率可能具有挑战性，但由于高功率传输，实现高效率也很重要。本文提出了一种半双有源桥 (DAB) 转换器的新颖控制策略，以实现宽电压增益，同时提高高输入电压和低输出电压工作点的效率，这是 BESS 完全启动时常见的情况。已充电，且 EV 电池电量不足。此外，本文还提供了一种算法，可以实时确定任何工作点所需的相移，从而无需离线设计控制轨迹。构建并测试了 550V、10kW 实验原型，以验证所提出的控制策略。在 25A 恒定充电电流下，原型表明，与众所周知的双相移控制相比，在高输入电压 (450–550V) 和低输入电压的工作点上，所提出的控制策略可将效率提高高达 3.5%。输出电压（150-275 V），峰值效率为 97.6%。