Improvement of Microgrid (MG) Systems Using Synchronverters (SVs)

Abstract

In this paper, the synchronverter (SV) model is revised and thoroughly examined. Detailed simulation blocks are clarified and presented using Matlab/Simulink. The aim is to enhance inertia contribution to approach equivalent real synchronous generator (SG) and by another meaning grid-friendly inverter that mimic the operation of conventional SG. Improvements in the two modes of operation grid-connected mode and stand-alone mode are obtained. SV is able to transfer seamlessly between the two modes and hence, they provide an ideal solution for smart grids and microgrids (MGs). An automatic synchronization unit is used to minimize disturbances at instant of connection to grid. Unlike most previous works in this area of research, the present one simulates also the pulse width modulation (PWM) inverter to monitor the dc bus condition during different conditions of operation. Simulation results are presented to verify all the above ideas.