ABSTRACT
Due to the randomness and discontinuity of solar energy, the power supplied by a photovoltaic power generation system varies randomly. A reasonable battery capacity is very critical to ensure that a photovoltaic (PV) micro-grid system operates economically and stably. When the battery is applied to an actual PV micro-grid system without considering its internal model, it may not be able to fully realize the effect of continuous power supply due to the limiting operating conditions of the battery itself. In order to resolve the problem of optimizing battery capacity for a PV micro-grid system, this paper presents optimization of battery capacity configuration based on its internal model. Based on the analysis of PV output characteristics, load characteristics and battery internal model, the mathematical model of optimizing battery capacity configuration can be expressed in a MATLAB procedure, and then the optimum battery capacity can be calculated, accounting for both the battery capacity cost and the effect on balancing power balance between PV and load. The effectiveness of the proposed method is verified by simulation.
