Affiliation:
1. Institute of Electrical Engineering, Chinese Academy of Sciences
2. State Grid Chongqing Electric Power Research Institute
3. State Grid Gansu Electric Power Company
4. State Grid Hangzhou Qiantang District Power Supply Company
Abstract
Abstract
Based on the SOH definition of relative capacity, a whole life cycle capacity analysis method for battery energy storage systems is proposed in this paper. Due to the ease of data acquisition and the ability to characterize the capacity characteristics of batteries, voltage is chosen as the research object. Firstly, the first-order low-pass filtering algorithm, wavelet packet decomposition algorithm, and empirical mode decomposition algorithm are used to decompose the voltage data of complete battery charging and discharging cycles into high & low frequency bands; Furthermore, the Pearson correlation coefficient is applied to analyze the linear relationship between high/low frequency band voltage and capacity, and to extract evaluation indicators related to capacity; Finally, the SOH evaluation accuracy of the proposed strategy through different application scenarios is verified to improve its generalization ability.
Publisher
Research Square Platform LLC