A novel method for connecting the PV unit to hybrid microgrid systems based on smart controlling structure

摘要

Hybrid microgrid is a practical network structure for new AC, DC or AC/DC power system topologies with various sources and loads. Operating the hybrid microgrid creates the smart controllability of all power sources based on the load demand in island mode especially. This paper proposes a hybrid AC microgrid structure which is designed for automatic interconnection between different sources in island mode. This paper control strategy is planned with considering to the configuration of two implemented power sources. The main DG source supplies all local load demand using its droop control characteristic. In critical conditions, a Photo-Voltaic (PV) source with battery energy storage is quickly linked to the DG source to ensure the hybrid microgrid performance. A novel control scheme is introduced to truly damp the system frequency and voltage disturbances and connect mirogrid sources to each other with high reliability and without any network failures in power sharing moments. The effectiveness of proposed control approach is verified throughout the simulation results.