Different power converter topologies are used to perform the energy exchange between an AC grid and a DC source belonging to a hybrid electric micro-grid. A single-phase single-stage isolated AC–DC power converter is one of them. Moreover, this power converter can operate under different modulation strategies. The phase-shift modulation (PSM) strategy is capable of varying the phase between the voltages applied to the high-frequency transformer terminals of the power converter in order to control the energy flow in both directions. Based on the PSM strategy, this study presents a novel modified PSM strategy capable of controlling the power flow in both directions and obtaining a current with low total harmonic distortion and a power factor close to 1 for the entire operating range on the AC side. Considering the novel modulation strategy to be proposed, a comparison of three PSM-based modulation strategies was carried out taking into account the total harmonic distortion of current injected into the AC grid, the power factor and the average power transferred. A theoretical analysis was carried out and the results obtained were validated by means of experimental results.

中文翻译：

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隔离式AC-DC电源转换器的新型改进相移调制策略

使用不同的功率转换器拓扑来执行交流电网和属于混合电微电网的直流电源之间的能量交换。单相单级隔离式AC-DC电源转换器就是其中之一。此外，该功率转换器可以在不同的调制策略下运行。相移调制（PSM）策略能够改变施加到功率转换器的高频变压器端子的电压之间的相位，以控制两个方向的能量流。基于PSM策略，本研究提出了一种新颖的改进的PSM策略，该策略能够控制两个方向上的功率流，并获得交流侧整个工作范围内总谐波失真低且功率因数接近1的电流。考虑到将要提出的新型调制策略，考虑了注入交流电网的电流的总谐波失真，功率因数和平均传输功率，对三种基于PSM的调制策略进行了比较。进行了理论分析，并通过实验结果验证了所获得的结果。