优化三相双有源桥式DC-DC变换器的调制策略,使电感电流在整个负载范围内的有效值最小

Zhuoqiang Li, Yue Wang, Ling Shi, Jun Huang, W. Lei
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引用次数: 19

摘要

本文提出了一种优化的三相双有源桥式(3d - dab) DC-DC变换器调制策略,该策略可以在整个负载范围内,特别是在低负载情况下,最大限度地降低电感电流的有效值,提高效率。在提出的调制策略中,引入了三个控制变量,两个占空比和一个相移比。本文采用多频近似方法对一种3p-DAB变换器的工作特性进行了通用分析。并推导了RMS电感电流和发射功率的解析表达式。为了获得电感电流均方根最小的最优情况,建立了约束非线性规划问题。在此基础上,应用优化算法内点法求解该问题,并推导出调制策略的控制变量。建立了实验样机,实验结果验证了采用该调制方案可实现RMS电感电流优化和效率提高。
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Optimized modulation strategy for three-phase dual-active-bridge DC-DC converters to minimize RMS inductor current in the whole load range
This paper proposes an optimized modulation strategy for three-phase dual-active-bridge (3p-DAB) DC-DC converters, which can minimize RMS inductor current and enhance the efficiency in the whole load range, especially under low load situations. Three control variables, two duty cycles and a phase-shift ratio, are introduced in the proposed modulation strategy. A universal analysis for the operating characterization of a 3p-DAB converter is presented using the multi-frequency approximation method. Moreover, the analytical expressions of RMS inductor current and transmission power are deduced. In order to obtain the optimal situation with minimization RMS inductor current, a constrained nonlinear programming problem is established. On this basis, an optimization algorithm, the interior-point method, is applied to solve the problem and derive control variables of the modulation strategy. An experimental prototype is established and the experimental results validate that the RMS inductor current optimization and efficiency improvement are realized by using the proposed modulation scheme.
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