Modeling and analysis of battery performance for renewable energy application

This paper models the performance of lead acid batteries operating in battery energy storage systems (BESS) for renewable energy applications. The considered system consists of a permanent magnet generator based wind turbine interfaced to the grid through fully rated converters. A battery energy storage system, interfaced to the grid via STATCOM is used for active power smoothing. A low power experimental BESS is interfaced to the system model. Two battery models, a simple- and a detailed- one, are implemented and verified against experimental data. A simple experimental test is proposed for measuring the battery internal resistance. The salient feature of this paper is the examination of the battery terminal voltage variation for the non-regular current profiles requested from the battery bank in renewable energy.