SVPWM Capacitor Balancing Method for Single-Phase Three-Level NPC Impedance-Source Inverters

This paper presents Space Vector Pulse-Width Modulation (SVPWM) strategy with capacitors voltages feedback for a single-phase three-level buck-boost Neutral Point Clamped (NPC) inverter coupled with impedance-source networks. The case study system is based on the quasi-Z-source inverter. The main advantages are demonstrated and discussed in the paper. This strategy can be implemented for systems with any impedance-source networks with neutral point. The simulation results confirm theoretical predictions.