Development of a new voltage source inverter (VSI) average model including low frequency harmonics

This paper presents an enhanced average model of a voltage source inverter (VSI) that can accurately predict some of the low frequency phenomena only seen by the switching models. These phenomena include the dead time, voltage drop across switching devices (switch & diode), different modulation and minimum pulse width. Simulation and experimental results with a 2 kW prototype is used for validation purposes. The paper shows the simulation results of both complete switching and proposed average model depicting a great match between the two. The enhanced average model showed very good matching with the switching model, about 2% difference in time domain and also harmonic spectrum analysis.