Isolated AC-DC Matrix Converter Based on Virtual Inductance Control

In order to eliminate the negative influence of the input LC filter in the isolated AC-DC matrix converter (IAMC) at the grid side power factor, and solve the problem of low power factor under light load conditions, an IAMC power factor control algorithm based on virtual inductor is proposed in this paper. When the system operates under different load conditions, the virtual inductor in parallel with the input capacitors can completely or partially compensate the phase difference between the grid side voltage and the grid side current according to the appropriate value. It realizes the effect of high-precision grid side power factor control and suppression of grid side current harmonics, and ensures that the system operate in the state of unit power factor or maximum power factor. The three-phase to single-phase matrix converter generates switching vector, which is combined with de-re-coupling vector modulation strategy to output high-frequency AC voltage, achieving power transmission between the front and rear stages, and simplifying the system topology. The simulation results show the proposed scheme can not only achieve the above effects, but also make the system obtain stable output waveform and good dynamic performance.