Abstract:

To investigate arc detection & protection methods in ESSs,an arc detection algorithm based on time-domain triggering and frequency-domain protection is proposed.Firstly,an arc detection hardware was designed,including self-check,gain,and filtering circuits.This hardware amplifies the peak-to-peak current variation difference after an arc occurs in the energy storage system,through the use of a TMR current sensor.Secondly,time-domain features are extracted using a delayed sliding window method for use as trigger conditions in the arc detection algorithm.Once triggered,frequency-domain features are calculated and input into the arc detection model.If it is determined to be a genuine arc event,the ESS immediately performs a shutdown action.The test results of the algorithm show that this method can accurately identify the arc faults in the energy storage system under series circuits,with a detection accuracy rate of 100%,meeting the requirements for practical applications.

Key words: ESSs, safety, arc detection and protection techniques, arc detection model