2nd China International Youth Conference on Electrical Engineering (CIYCEE 2021)

151 / 2021-10-28 19:30:16

A Multi-time Scale Joint Online SOC&SOH Estimation Method for Energy Storage System

energy storage,SOC&SOH joint estimation,double extended Kalman filter,multiple time scales

Renewable energy system > Energy storage system application

In order to effectively monitor the operating status and health of the single battery in the distributed energy storage system, timely issue early warning information of failures and provide decision-making basis for operation, inspection and maintenance, a joint online estimation method of single battery SOC(state of charge) and SOH(state of health)  is proposed in this paper. First, the second-order circuit model of battery is used to construct state space model. Second, the constructed battery state space model is discretized, so a multi-time-scale SOC&SOH joint online estimation method based on the combination of a short-time-scale state filter and a longer-time-scale parameter filter is proposed. Finally, the effectiveness of the method proposed in this paper is verified by simulation.