With the rapid demand of electricity, the installation of power electronics-based equipment in power distribution system has grown rapidly for ac/dc system coupling, system protection, alternative energy source interface, etc. This paper focus on power electronic component and system modelling techniques and three-phase ac/dc power flow analysis for power distribution systems. The research discusses the models that are developed for unbalanced power electronic converters, such as thyristor converters, diode rectifiers, and Pulse-Width- Modulated (PWM) converters. The modelling approach captures the imbalance of distribution systems using three, delta-connected, single-phase converters. To perform system analysis, these models have been incorporated into two types of ac/dc power flow solvers: A three-phase backwards/forward sequential solver and a three-phase unified solver using the modified nodal analysis method. Both solvers have been applied to unbalanced radial and weakly meshed distribution systems. Finally, an ac/dc system hardware test bed was created to validate the proposed models and the performance of the power flow solvers. Extensive hardware tests, time-domain simulations, and steady-state analysis have been performed.
power distribution system, Pulse-Width- Modulated (PWM) converters, AC system, DC system
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