Space vector modulation applied to star, delta and bridge connected unidirectional PWM rectifiers

Abstract

This work presents a methodology to apply space vector modulation to unidirectional pulse width modulation (PWM) rectifiers and applied in three different groups of rectifiers. Converter switching stages are analyzed for each group of rectifiers to determine switch control signals for space vector modulation. A switching sequence is proposed to minimize the number of switch commutations and reduce the switching losses. Duty cycle functions are determined and the desired switching sequences are performed by a simple PWM, with no need to determine the present sector of the vector. For this purpose, it is necessary to impose the desired current sectors from input voltage references. Simulation results of proposed modulation techniques are also presented.