Analysis Design and Simulation of a Three-Phase Three-Level Nine Switches Inverter Using Space Vector Modulation

This paper presents an analysis and design procedure of a three-phase three-level nine switches voltage source inverter using the space vector pulse width modulation (SVPWM) control scheme. The proposed inverter consists from a main inverter switches Q₁, Q₂ , Q₃, Q₄, Q₅ and Q₆, an auxiliary three bidirectional switches S₁ S₂, and S₃ and two capacitor banks C₁ and C₂. Where ideal switches and diodes will be assumed and the dc bus capacitor bank voltages fluctuations will be absent. The effectiveness of the SVPWM control scheme is verified by the simulations results in the worst case where two very low switching frequencies values of 1 kHz and 5 kHz will be considered