Evaluation of energy storage systems in modern power system

Abstract

Power systems are experiencing frequent changes in its operation considering emerging power market structures and deregulations, and high penetration of power electronic based components including renewable energy source (RES). However, fast acting Energy Storage Systems (ESSs) have the potential to stabilize the operational issues of the power system. The work in thesis evaluates the role of the ESSs and provides solutions through their application to overcome the challenges of modern power systems. The effectiveness of capacitive energy storage in a two-area interconnected power system having multiple hydro-thermal-gases mixed generating units for providing frequency regulation under deregulated environment has been investigated on this thesis. The study is further extended by integrating wind generation. The coordinated action of RFB and a doubly fed induction generator (DFIG) based WTU to enhance the dynamic performances of a multisource interconnected power system in a deregulated electricity market has been examined. Some of the conclusions drawn from the thesis are that CES effectively controls the grid frequency and tie-line power oscillations during sudden load changes in the power system. The coordinated operation of RFB with WTU has been found effective in enhancing the grid stability during higher penetration of wind generation with conventional generators. The MPHES system efficiently contributes towards keeping the microgrid and multi-microgrid systems more consistent under the situation of generation and load demand imbalance. Among battery ESSs, lithium-ion batteries are techno-economically more feasible compared to the lead-acid battery and can be effectively used for electricity storage applications in modern power systems. newline