Optimal Phase-Shift Control to Minimize Reactive Power for a Dual Active Bridge DC-DC Converter
Optimal Phase-Shift Control to Minimize Reactive Power for a Dual Active Bridge DC-DC Converter
复制标题
用于最小化双有源桥 DC-DC 转换器的无功功率的最佳相移控制
DOI：
10.1109/tpel.2018.2890292
复制
发表时间：
2019-10-01
影响因子：
6.7
通讯作者：
Sheng, Kuang
中科院分区：
文献类型：
--
作者：
Shao, Shuai;Jiang, Mingming;Sheng, Kuang
在双有源桥（DAB）DC-DC变换器中，在非单位电压增益条件下，通过调节移相比可以抑制无功功率，提高变换器的效率。推导最佳相移比以实现最小无功功率是具有挑战性的，因为DAB可以在四种不同的场景（前向/后向、降压/升压）下操作，并且每种场景具有五种操作模式。本文首先介绍了一种转换，其中不同的DAB操作方案（前向/后向，降压/升压）可以等同于彼此，然后只需要一个方案（前向/降压）的优化。其次，针对正向/降压模式下的5种工作模式，采用图解法证明了模式1、2、5的工作点都可以映射到导通损耗较低的模式3的工作点，并且只有2种模式需要详细分析。逐步推导了这两种模式的优化过程。提出了在四种不同DAB操作场景（前向/后向，降压/升压）下使无功功率最小化的全局最优相移信号。为实际实现全局无功功率最小化控制，给出了一个简单的表格和控制框图。与其他调制方案的实验比较，验证了所提出的控制方法的效率提高。
In a dual active bridge (DAB) dc-dc converter, modulating the phase-shift ratios can suppress reactive power and increase the efficiency under non-unity voltage gain conditions. Derivation of the optimal phase-shift ratios to achieve the minimum reactive power is challenging because a DAB can operate in four different scenarios (forward/backward, buck/boost) and each scenario has five operating modes. This paper first introduces a transformation in which different DAB operating scenarios (forward/backward, buck/boost) can be equivalent to one another; then optimization of only one scenario (forward/buck) is required. Next, for the five modes in forward/buck scenario, based on a graphical method, this paper proves that each operating point of Modes 1, 2, and 5 can be mapped into that of Mode 3 with lower conduction losses, and only two modes require detailed analysis. The optimization process of these two modes are derived step-by-step. Global optimal phase-shift signals that minimize the reactive power under four different DAB operating scenarios (forward/backward, buck/boost) are presented. A simple table and control block diagram are presented for practical implementation of global reactive-power minimization control. Experimental comparison with other modulation schemes verifies the efficiency improvement of the proposed control method.