Improvement the Dynamic Voltage Profile by a Voltage Stabilizer in Microgrids with a Type of Inverter Based Resource

The electrical distances between reactive power sources and the loads that need reactive compensation are not too much in microgrids. Thus, a coordinated compensation of reactive sources should be implemented to avoid a fast voltage collapse and improve the dynamic voltage profile by proposing a MicroGrid Voltage Stabilizer (MGVS). This stabilizer was used in microgrids with synchronous machine based resources. Main purpose of this research is verify the performance of the stabilizer by applying it to microgrids containing power-electronic converter based distributed generations (DGs). So that a 21-bus IEEE microgrid with three photovoltaic (PV) resources is tested. At first, PV resource and all of its needed equipments, are modeled. Then a control model of the stabilizer with appropriate parameters, is presented. Voltage deficiency of the system is the input of the stabilizer, and the output signal of the stabilizer, is divided between the DGs in order to provide required reactive power. The dynamic voltage profile of buses in presence of MGVS and its absence has been compared by implying disturbances. Simulation results in MATLAB/SIMULINK show that the dynamic voltage profile of buses improves satisfactorily with the addition of MGVS.