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首页> 外文会议>Annual Conference of the IEEE Industrial Electronics Society >Time-varying full-order state-space modeling of variable-switching-frequency control for single-phase single-stage dual-active-bridge based AC/DC converter
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Time-varying full-order state-space modeling of variable-switching-frequency control for single-phase single-stage dual-active-bridge based AC/DC converter

机译：基于单相单级双有源桥AC / DC转换器的可变开关频率控制的时变全阶状态空间建模

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摘要

Full-bridge power-factor-correction (PFC) front-end + dual-active-bridge (DAB) AC/DC topology is widely used and its small-signal model has been studied in depth. Compared to the two-stage design, the single-stage design, unfolding bridge + DAB, is attracting more attention nowadays. By eliminating the bulky DC link bus capacitor and operating the front-end with only 60Hz switching frequency, the DAB based single-stage AC/DC converter has the potential to increase the system power density and efficiency. Different from the conventional constant-switching-frequency (CSF) DAB control, a novel variable-switching-frequency (VSF) DAB control is more suitable for the single-stage design due to the 0 to peak input voltage. A full-order state-space model is proposed in this paper to describing the VSF control. The influence of DC blocking capacitor is stressed because there is always a low frequency excitation of VSF control which is not existed with CSF control. The resonance of DC blocking capacitor and transformer leakage inductor is well described by the full-order state-space model. Simulation and experimental results verified the correctness of proposed DAB full-order state-space model.
机译：全桥功率因数校正（PFC）前端+双有源桥（DAB）AC / DC拓扑已被广泛使用，并且已对其小信号模型进行了深入研究。与两阶段设计相比，单阶段设计，可扩展的桥+ DAB如今引起了更多的关注。通过消除笨重的DC链路总线电容器并仅以60Hz的开关频率操作前端，基于DAB的单级AC / DC转换器具有提高系统功率密度和效率的潜力。与传统的恒定开关频率（CSF）DAB控制不同，新型的可变开关频率（VSF）DAB控制由于输入电压为0至峰值而更适合于单级设计。本文提出了一个全序状态空间模型来描述VSF控制。由于总是存在VSF控制的低频励磁，而CSF控制不存在，因此需要使用隔直电容器的影响。全阶状态空间模型很好地描述了隔直电容器和变压器漏感器的谐振。仿真和实验结果验证了所提出的DAB全阶状态空间模型的正确性。

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