SOLAR PHOTOVOLTAIC ARRAY – STORAGE COMBINATION OPTIMIZATION FOR STAND-ALONE SYSTEMS
Keywords:
Storage Capacity (CS), Array Capacity(CA), State of Charge (SOC), Loss of Load Probability (LOLP), Photovoltaic (PV)Abstract
This study presents a method of optimizing photovoltaic array and storage in standalone photovoltaic (PV) system. The configuration consists of two components parameters; arrays capacity and storage/(battery) capacity. By adjusting these two parameters, the reliability of the PV system can be determined. The reliability of the PV system is determined based on the concept of Loss of Load Probability (LOLP) from which the optimum storage and array capacities CS and CA respectively, may be define with respect to the costs per unit energy generated by the PV array and cost per unit energy stored in the storage. The standalone PV system energy was
simulated using data for 21 year for three locations in Nigeria. A numerical method is applied to generate LOLP- array capacity plots for definite storage capacities and iso-reliability plots obtained from these for three locations in Nigeria. The correlation coefficients of iso-reliability lines range from 0.7931 to 0.9967 for the three locations considered. Regression method is applied to the equations for each set of iso-reliability lines to obtain a general equation relating array capacity to storage capacity for each location which is then optimized with respect to cost to obtain an expression for the storage capacity at the lowest system cost.
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