Research on energy management and control method of microgrid considering health status of batteries in echelon utilization

Abstract

With the large-scale application of electric vehicles, the use of retired power batteries in power system and other fields has become a trend in the future. How to quickly and accurately estimate the health status of power batteries and reasonably carry out energy management has become one of the main problems to be solved. This paper takes the application of retired power batteries in microgrid (MG) as an example. Firstly, considering the influence of the depth and times of batteries charge and discharge on the operation life, the life loss model of retired power batteries is established, and the coupling relationship between the power batteries life decay model and SOC, SOH is established. Secondly, according to the characteristics of SOC and SOH, K-means clustering method is used to cluster the batteries to construct the energy storage system (ESS). Finally, considering the characteristics of supply and demand balance, operation reliability and economy, the energy management and control of ESS in MG is carried out. Simulation results show that the proposed energy management and control method can effectively improve the economy, reliability and security of the ESS in the process of echelon utilization.