Meeting Generation Schedule of Wind Farms with Battery Energy Storage Systems A Case study of Adama I wind farm

Abstract

This study is based on an idea of integrating battery energy storage systems (BESS) into wind farms (WFs) so that BESS-integrated WFs will get the ability to inject energy into power grids as pre-determined generation schedule which was set previously based on the meteorological forecast and BESS characteristics. In this study, it is proposed to integrate two independently controlled BESSs into the WFs so that it would balance stochastic power deviations between actual wind power and the scheduled power. Simulating models on operations of the BESS integrated WF during a year have been built using conditional statements or linear optimization and solved in MATLAB. Technical performances of BESS-Integrated wind farm on meeting generation schedule along with the cost, benefits and the profit attributed to the BESSs are therefore measured by a series of indices proposed in this work. Based on simulation results, technical and economic indices of a dual battery operation under both state exchanging strategies were compared with a single battery operation. Simulation results shows that charging/ discharging state exchanging strategy of the BESS (in case of two battery integration) as well as the number of batteries integrated to the wind farm (single or dual) has significant impacts on the performance of the BESS-integrated WF. At 2MW battery, the wind farm‘s probability of meeting generation schedule (PMGS) was improved from 51.11% to 70.88%, 61.6% and 69.74 % by simultaneous state exchanging strategy, asynchronous state exchanging strategy and single battery operations respectively. At this battery size, the profit of wind farm was found to be 2,289,898ETB when simultaneous state exchanging strategy is adopted. For asynchronous and single battery operation, the profit was -2,369,648 and -3,574,103 ETB respectively