Solid state voltage regulator for isolated asynchronous generators supplying 3-phase 4-wire loads

This paper deals with the solid state voltage regulator also known as static compensator (STATCOM) to control the voltage of constant speed prime mover driven isolated asynchronous generators for feeding 3-phase 4-wire loads. The voltage regulator for the isolated asynchronous generator (also known as self excited induction generator (SEIG)) with the desirable features of synchronous condenser, and is capable of operating in capacitive and inductive modes. The proposed controller is realized using 4-leg IGBT (Insulated Gate Bipolar Junction Transistor) based current controlled voltage source converter (CC-VSC) with a self supported DC bus. The proposed generating system is modelled and simulated in MATLAB along-with Simulink and PSB (power system blockset) toolboxes. The simulated results are presented to validate the feasibility of generating system for feeding 3-phase 4- wire loads with neutral current compensation driven by constant speed, variable power applications of SEIG.