Improving of uncertain power generation of rooftop solar PV using battery storage

As the distribution grid increasingly integrate rooftop solar PV, their power generation outputs are uncertain due to the solar radiation, panel temperature, passing cloud, and v-i characteristic operating level. Therefore, PV grid connected system would require a supplementary source to ensure more stable PV power generation, particularly during cloudy periods. In this paper, the battery storage energy management strategy (BS-EMS) is investigated to decrease the effect of sudden power generation variation of rooftop solar PV. The balance of power between rooftop PV and battery storage is studied by dynamic control of the BS converter to maintain stable output power at the point of common coupling (PCC). Simulation results for a 24 hour period indicate the performance of battery storage system capable of smoothing out grid connected solar PV generation under various conditions.