Minimum-Backflow-Power Scheme of DAB-Based Solid-State Transformer With Extended-Phase-Shift Control
Minimum-Backflow-Power Scheme of DAB-Based Solid-State Transformer With Extended-Phase-Shift Control
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DOI：
10.1109/tia.2018.2819120
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发表时间：
2018-07-01
影响因子：
4.4
通讯作者：
Ma, Jieming
中科院分区：
文献类型：
--
作者：
Shi, Haochen;Wen, Huiqing;Ma, Jieming
作为柔性直流分布式电力系统的关键部件，基于双有源桥式（DAB）变换器的高效宽工作范围固态变压器（SST）是必不可少的。然而，传统的移相控制，高回流功率和电流应力将显著影响转换效率。本文对基于dab的SST变换器两侧回流功率特性进行了全面分析。在此基础上，建立了完整的传输功率、回流功率和峰值电流数学模型。然后，提出了一种基于最小回流功率的扩展相移控制策略，并利用Karush-Kuhn-Tucker函数确定各种情况下的最优相移对。比较了不同算法的回流功率和电流应力曲线。结果表明，所提出的控制方法可以提高输出功率调节的灵活性，减小回流功率，提高大工作范围内的效率。最后，开发了基于dba的SST原型，实验结果验证了所提控制策略的有效性。
As key component for the flexible dc distributed power system, the dual active bridge (DAB)-converter-based solid-state transformer (SST) with high efficiency for a wide operating range is essential. However, with the traditional phase-shift control, high backflow power and current stress will significantly affect the conversion efficiency. In this paper, the backflow power characteristics in both sides of DAB-based SST converters are comprehensively analyzed. On this basis, complete transmission power, backflow power, and peak current mathematical models are established. Then, a minimum-backflow-power-based extended-phase-shift control strategy is proposed with the determination of optimal phase-shift pairs by using the Karush-Kuhn-Tucker function for various scenarios. The backflow power and current stress curves with different algorithms are compared. It shows the proposed control can improve the output power regulation flexibility, minimize the backflow power, and improve the efficiency in wide operating range. Finally, a DAB-based SST prototype was developed and the experimental results verified the effectiveness of the proposed control strategy.