改进的双有源桥式变换器负载瞬态响应

Shengzhi Zhou, Chuan Sun, Song Hu, Guo-Tian Chen, Xiaodong Li
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引用次数: 8

摘要

本文研究了双相移(DPS)控制下双有源桥式(DAB)变换器对负载变化命令的瞬态响应。在暂态过程中,由于暂态调制不当,可能会在电感和变压器中产生直流偏置电流和超调电流。然后提出了一种专用的瞬态调制方法,该方法通过参考浮动基准门控信号来调整所有相移比。因此,可以获得快速的瞬态响应,没有直流偏置电流和超调电流。在不同的稳态工作模式下,浮动参考信号的动态运动可以很容易地用一个统一的表达式来确定。仿真和实验结果验证了所提出的暂态控制方法。
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Improved Load Transient Response of a Dual-Active-Bridge Converter
In this work, the transient response of a dual-active-bridge (DAB) converter to load-change command is investigated under dual-phase-shift (DPS) control. During the transient process, there might be dc bias current and overshoot current arising in the inductor and transformer due to improper transient modulation. A dedicated transient modulation method is then proposed, which adjusts all phase-shift ratios by referring to a floating reference gating signal. Consequently a fast transient response can be obtained without dc bias current and overshoot current. The dynamic movement of the floating reference signal can be determined easily by a uniformed expression irrespective of the different steady state operation modes. The proposed transient control has been proved through simulation and experimental results.
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