A MODIFIED SPACE VECTOR MODULATION METHOD IS PROPOSED FOR T-TYPE INVERTER POWER FACTOR CORRECTION

Abstract

Currently, in the Onboard Charger system of electric vehicles, PFCs are multi-level inverters
(MLIs) and are mainly modulated by the sinusoidal pulse width modulation (SPWM) method, in
which space vector pulse width modulation (SVPWM) is the superior method. However, when the
number of levels increases, the implementation of SVPWM for multi-level inverters encounters
many difficulties. This paper will introduce a modified SVPWM method, which is a two-branch
modulation technique to improve the quality of output voltage for PFCs, and compare this
modified method with the SPWM modulation method. Simulation results will demonstrate the
advantages of the proposed method.