A high-power-density single-phase inverter with pulse current injection power decoupling method

This paper presents high-power-density inverter with pulse current injection power decoupling method. In order to reduce the dc-link capacitor significantly, dc-link current is fully analyzed with double Fourier method in theory. Compared with the traditional 2nd harmonic power decoupling method, the pulse current injection method considers not only 2nd order harmonic but also the higher order harmonics. As a result, it can further reduce the dc-link capacitor value. The relationship between the dc-link capacitor value and different order harmonics has been investigated and analyzed. It shows that when dc-link capacitor value is reduced to one critical value, traditional 2nd harmonic power decoupling method is limited. Finally, one novel pulse current injection method is proposed and verified by simulation.

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