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Control and efficiency optimization of Dual-Active-Bridge DC/DC converter

机译：双有源桥DC / DC转换器的控制和效率优化

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摘要

Bidirectional isolated DC-DC converters such as Dual Active Bridge (DAB) converters are key components for the solid-state transformer (SST) applications. However, the efficiency of DAB converter with the traditional control, namely Single-Phase-Shift (SPS), is very low due to high circulating current. In this paper, the power flow characteristics of DAB converter is analyzed and then the expressions for the backflow power are obtained. In this paper, extended-phase-shift (EPS) control is adopted to minimize the backflow power. A comprehensive comparison of EPS and SPS is conducted in terms of the transmission power, backflow power and peak current. Meanwhile, the design of the closed-loop control with EPS is presented. Finally, in order to confirm the correctness of proposed control strategy, a 20 kHz 1kW DAB prototype controlled by TMS320F28335 DSP was built and main test results were presented.
机译：双向隔离式DC-DC转换器（例如双有源桥（DAB）转换器）是固态变压器（SST）应用的关键组件。但是，由于循环电流高，采用传统控制的DAB转换器（即单相移位（SPS））的效率非常低。本文分析了DAB变换器的潮流特性，然后得出了回流功率的表达式。本文采用扩展相移（EPS）控制来最大程度地减小回流功率。对EPS和SPS的传输功率，回流功率和峰值电流进行了全面比较。同时，提出了带EPS的闭环控制的设计。最后，为了确认所提出控制策略的正确性，构建了由TMS320F28335 DSP控制的20 kHz 1kW DAB原型，并给出了主要测试结果。

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