A Study on Performances of Flexible Power Control with Empirical Lithium-ion Battery Modeling in PV Power Systems

PV power generation system has a concerning aspect of the power quality due to the cloudy condition from unstable weather. Battery energy storage system (BESS) is one of the effective technologies for smoothing the power fluctuation and intermittency results. Applying flexible power point tracking algorithm (FPPT) with BESS is proposed to improve the dynamic of PV power converters. The battery modeling based on the transient responding equivalent circuit is implemented to each cell of the batteries to understand the dynamic behavior of the battery with FPPT in PV generation system. By applying both strategies, the power fluctuation can be efficiently suppressed in the PV generation system with the minimal energy storage installation. The hardware-in-the-loop (HIL) real-time simulation is demonstrated with the actual irradiance profile to validate the proposed system with the proposed battery modeling under the varying climate conditions.