A study of battery energy storage dynamics in power systems
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Date
2014
Authors
Bazargan, Damon
Journal Title
Journal ISSN
Volume Title
Publisher
IEEE
Abstract
This thesis introduces an approach to study the effect of battery parameters on the stability and the response dynamics of a grid-connected battery energy storage systems (BESS). In this study, averaged-value modeling technique is used to formulate a grid-connected battery energy storage system. State equations are used to study the impact of battery parameters on system’s
performance. Furthermore, a fully-detailed transient model of a grid-connected battery energy storage system is developed in an electromagnetic transient
simulation software (PSCAD/EMTDC). This model includes BESS components such as batteries, power-electronic converters, voltage source converters (VSCs) and BESS’ controllers of all levels.
This research investigates the impact of battery parameters such as the internal resistance and the state of charge on the stability of BESSs and determines a stability region in which BESSs perform normal operation. It is shown that in an unstable region, the BESS is incapable of delivering the desired power to the grid. This research is also focused on improvement of BESS dc-link voltage regulation upon a change in the BESS power set-point and also BESS response
dynamics in the grid. To analyse the stability region and improve the response dynamic of a BESS, an alternative configuration of battery cells in a battery bank is proposed and evaluated.
Control systems of a BESS are also investigated as key contributors to the response dynamics of the system. A feed-back/feed-forward control strategy is proposed and evaluated to improve the response dynamic of a BESS.
The outcomes of this research are useful in the design stages of a BESS where response dynamics of an energy storage system is important. In addition, since the internal resistance of a battery increases by aging of battery cells, studying the effect of battery aging on BESS stability and operation is useful in annual maintenance of a commissioned BESS in the grid.
Description
Keywords
Battery, Power systems, Stability
Citation
7