A Grid Interfaced Multiple PV Arrays Based Three Phase Microgrid With Battery Energy Storage

This paper presents a solar photovoltaic based grid interfaced microgrid. The microgrid is capable to function while connected to the grid, and effectively operates in isolation, at anomalous grid conditions. It also features the ability to carry out on-line resynchronization to the grid, on resumption of healthy grid. The microgrid consists of two independent PV arrays, each coupled via boost converters to voltage source converters (VSCs), whose outputs feed the local loads connected at the point of common coupling (PCC). A battery energy storage (BES) unit interfaced with one of the VSC's, ensures power availability at loss of PV generation and the grid connection. It also stores up the surplus PV power generation. The BES is further leveraged to mitigate the fluctuations in the power delivered by the microgrid to the grid. The presented control remedies the ill effects of nonlinear loads and abnormal grid circumstances. The microgrid behavior is analyzed at several dynamic conditions.