Abstract:
Rising fuel prices around the world and the impact of greenhouse gas emissions coming from fossil resources on the environment provide more for the use of renewable energy resources in power grids. The concept of the hybrid system is the most favorable in order to integrate clean sources into a conventional distribution network. This hybrid system can operate as a connected or disconnected from the grid to supply rural areas with electrical energy. It can include distributed energy resources as well as energy storage systems and loads. The integration of renewable energies in a microgrid in isolated operation can cause considerable impacts on electrical values such as voltage and frequency. This is why in this thesis, an optimal sizing and control strategies of a microgrid comprising photovoltaic productions, a wind generator and battery energy storage systems are proposed. First, an optimization technique based on a case study by HOMER Pro software is used to find the optimal sizing of a microgrid. Second, an intelligent control strategy based on fuzzy logic is applied to regulate the voltage and frequency of an island microgrid using a single inverter. And finally, an energy management method based on droop control is proposed for multiple inverter operation. The simulation results obtained show the precision and efficiency of the proposed solutions.
