Abstract:In this paper a new concept for control and performance assessment of compressed air energy storage (CAES) systems in a hybrid energy system is introduced. The proposed criterion, based on the concept of energy harvest index (HEI), measures the capability of a storage system to capture renewable energy. The overall efficiency of the CAES system and optimum control and design from the technical and economic point of view is presented. A possible application of this idea is an isolated community with significant wind energy resource. A case study reveals the usefulness of the proposed criterion in design, control and implementation of a small CAES system in a hybrid power system (HPM) for an isolated community. Energy harvested index and its effectiveness in increasing the wind penetration rate in the total energy production is discussed.
One of the main concerns of hybrid power system is the fluctuation of voltage and frequency of the system due to variation in the load and renewable power. A number of different types of energy storage techniques, which are theoretically and operationally available, have been proposed to remedy such fluctuations. One long-term storage option is compressed air. In this paper, the effects of the working pressure and system design of a typical compressed air storage system on the overall performance of a hybrid system is investigated. The model of a hybrid wind-diesel-compressed air generating system is developed and simulated using MATLAB. It is shown that the energy storage system and the proper sizing of the same play a vital role in increasing the renewable energy penetration.Index Terms-hybrid power systems, compressed air energy storage, renewable energy, system optimization and sizing.
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