PV-Battery System with Enhanced Control for Microgrid Integration

With the development of Distributed Energy Systems the dynamic support of Microgrids Energy Quality is of great importance an optimized operating scheme for a grid-connected based photovoltaic (PV) system is analyzed. The proposed model comprises of a PV plant with lead acid batteries (LABs) Energy Storage coupled to the grid by means of a three-phase inverter (VSI). The PV plant and the battery storage are integrated with the help of dc-dc and dc-ac converters in such a way that bidirectional flow of active and reactive powers can be achieved. The required power for the connected loads can be effectively delivered and supplied by the proposed PV system and energy storage systems, subject to an appropriate control method. The ultimate goal of any power system is to maintain a balance between demand and supply of active and reactive power at any given point in time. Controllers integrating energy sources respond to the received signals and attempt to fulfill the grid demand. The system response is almost instantaneous and thus can be very helpful in grid frequency and voltage support. The grid voltage harmonic generation influences the current controller and generates current harmonics; the used compensator is effective for both positive and negative sequence fifth and seventh harmonics. Simulation tests validate the proposed analyzed control.