Integrated Control And Protection System With A Hierarchical Coordination Control Strategy For Grid Connected PV System

Abstract: The microgrid has shown to be a promising solution for the integration and management of intermittent renewable energy generation. This paper looks at critical issues surrounding microgrid control and protection. It proposes an integrated control and protection system with a hierarchical coordination control strategy consisting of a stand-alone operation mode, a grid-connected operation mode, and transitions between these two modes for a microgrid. This approach provides a more reliable and robust grid as the systems can supplement each other. However, protection and control in a meshed power network setup is a challenge. This is because a meshed microgrid has more interconnections and interfaces compared to radial architecture power grid. This is further complicated by effects of DG on power quality, such as transients. This study is expected to provide some theoretical guidance and engineering construction experience for microgrids in general.