Pre-feasibility study of a grid connected wind-PV hybrid system with energy storage and power prediction.

Abstract

A simulation system using Matlab/ Simulink® for battery sizing in grid-connected renewable generation is compared with results from the optimization tool HOMER. The system is intended to reinforce remote weak distribution grids. The power injection of the hybrid generation system to the grid is defined by a power prediction method. The battery smoothes the power output and absorbs the prediction errors. As a reference, a wind – battery system is chosen. The impact of the integration of photovoltaic generation is studied. As an example for the meteorological conditions, wind data from the airport and solar irradiation mean values for Zaragoza are applied. Simulated renewable power ranges from 600 kW to 1.1 MW. The battery sizes obtained from the Matlab simulation differ substantially from HOMER results but show similarities. This is due to the difference in the battery models. Integration of solar generation can reduce battery size relative to total installed power and also reduce total cost of generated energy.