Abstract

In this paper, an evaluation method of the Lithium battery life attenuation degree is presented and the evaluation index of battery operation optimization degree is established according to the method. Meantime, it adopted the piecewise average algorithm and power management unit to determine the reference power of each energy storage unit. Further, in order to improve the service life of lithium battery in hybrid energy storage system, dual battery structure and their operation control strategy are designed to make the lithium battery running in the optimal charge and discharge depth. At last, based on the basic parameters of large-scale battery energy storage system which wind farms and photovoltaic power plants have installed in some region, the rationality and effectiveness of the above structure and operation control strategy of energy storage system are verified.

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