Virtual synchronous generator control method for improved T-type inverters employing RB-IGBT switches

Abstract

The paper proposes the control model of a T-type inverter that simulates the operating characteristics of a synchronous generator (VSG-T). The model is developed by incorporating the mathematical equations representing the mechanical and electromagnetic behavior of a traditional synchronous generator into the active and reactive power control loops. Therefore, the VSG-T can be connected in parallel with the grid, controlling power in a manner similar to traditional generators, directly participating in frequency and voltage regulation, and emulating inertia and damping characteristics to stabilize the grid frequency. Moreover, simulation results on MATLAB/Simulink software indicated that the VSG-T using RB-IGBT switches achieved voltage quality with a voltage THD of 1,23 % and a current THD of 2,19 %, which is significantly lower than the IEEE 1547-2018 standard requirement (< 5%).