Application of Hybrid Energy Storage System in Micro-grid
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Abstract
Micro-grid is the effective way of accommodating distributed generation. Energy storage (ES) system in micro-grid can be contributed to the improvement of power quality, power balance control, operation stability enhancement and optimal energy management. A hybrid energy storage system (HESS) combines the high power density ES unit and the high energy density ES unit efficiently, and has the advantage of both type ES unit, which can be controlled effectively to improve the operation characteristic of micro-grid. In this paper, the application of the HESS in micro-grid was studied from aspects of application mode, control strategies and optimal allocation. Firstly, according to the different connection mode between the ES unit and the system bus, the application of the centralized HESS and the distributed HESS are analyzed. Secondly, based on the control method of ES to improve the operation of micro-grid, the coordination control of ES unit in HESS is summarized. Finally, the issue of optimal allocation of HESS in micro-grid is analyzed. Integrating with the coordination control of HESS, the suggestion for optimal allocation of HESS is proposed.
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