Abstract
The high frequency link matrix converter modular parallel system (MPS-HFLMC) has the advantages of single-stage power conversion, large voltage, high efficiency and high power. It has wide application prospects in electric vehicle charging systems. However, reactive power exists in the grid, which will reduce the power supply capacity of the grid and cause the grid voltage to drop. The <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">$LC$</tex> filter on AC side of HFLMC will make AC voltage and current phase have a certain phase offset, so that the grid generates reactive power. The large-scale application of electric vehicle charging piles has exacerbated this problem. Therefore, this paper proposes a reactive power compensation method for MPS-HFLMC. First, the MPS-HFLMC model is established. The relationship between angle and reactive power is revealed. Then, the vector rotation space vector modulation (V-R-SVM) is employed to improve the power factor. At the end of this paper, the efficiency of the suggested reactive power compensation strategy is shown by simulation results.
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