3-phase converter model for unbalanced radial distribution power flow studies-thyristor rectifier and pulse-width-modulated inverter

This paper proposes an extended three-phase converter model for unbalanced power flow studies [Stoicescu, R et al., 2002]. The actual three-phase converters presented in this paper consist of a thyristor rectifier, a dc system, and a pulse-width-modulated (PWM) voltage source inverter. The converter is modeled with three single-phase, grounded, Y-connected converters. It is equivalent to the actual converters with respect to the average dc current on the dc link. The converter model is integrated into an unbalanced sequential power flow solver. The solution algorithm is tested in a 16-bus test system. Simulation results are presented.