储能系统直流电弧故障的检测与保护技术的研究及应用

Research and Application of Detection and Protection Techniques for DC Arc Faults in ESSs

探讨储能系统中的电弧检测与保护方法,提出一种基于时域触发加频域保护的电弧检测算法。首先,设计了包括自检、增益及滤波电路在内的电弧检测硬件,通过隧穿磁阻效应(TMR)电流传感器放大储能系统拉弧后的电流峰峰值变化差异。其次,利用延时滑窗法提取时域特征作为电弧检测算法的触发条件,触发后计算其频域特征输入电弧检测模型,判定其为真实拉弧后,储能系统立刻进行关机动作。算法的测试结果表明,该方法能够准确识别出串联回路下的储能系统电弧故障,检测准确率100%,能够满足实际应用中的需求。

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.