Impact of BESS Operating Methods on Reliability of Renewable Energy Sources

The undispatchability of the wind farms poses lot of grid integration challenges like power balancing, increased ancillary service requirements and maintains grid security as well as reliability. The new grid regulation emphasises the wind farm to be dispatch like the conventional power plant, hence the wind farm operators have to deploy energy storage systems (ESS) to absorb the wind variability and to make wind farm dispatchable. The size of the storage can be determined from the statistical profile of the wind speed. To manage these ESS, different operating strategies have been reported in different paper, literature survey indicates that the impact of the performance of these operating strategy on the reliability of the wind farm has not be studied. In this paper we are evaluating the performance of well known method like minute-by-minute (MBM), min-max (MM) and moving horizon predictive control (MHPC) methods by evaluating reliability indices like energy served (ES), energy not served (ENS) and energy not utilised (ENU). The impact of operating methods on the lifetime of the BESS has been also been presented in this paper. Persistence method which is a well-established wind forecasting method is used for accurate short term wind power prediction.