A Single-Stage Three-Phase Split-Y-Source Inverter

Abstract

This paper proposes a three-phase voltage source inverter (VSI), assisted by a Y-source network to perform single-stage DC to AC power conversion with the amplitude of output voltage higher than the DC input voltage. Analysis shows that while the modulation and boost duty ratios can be increased simultaneously, the proposed inverter achieves a high boosted-voltage without using large numbers of turns ratios of the coupled inductor. Leakage effect of the Y-source network is avoided as the leakage current is released to the DC link smoothly without being abruptly changed. In addition, a diode-capacitor voltage-clamp cell is employed to eliminate the voltage oscillation caused by resonance between parasitic capacitance and the leakage inductance. Theoretical analysis, simulation and experimental results have verified the feasibility of the proposed inverter.