故障电流早期检测及其过零点预测的相控开断技术

Fault ourrent early detection and zero crossing prediction of the phase-controlled interrupting technology

为实现相控分断短路电流技术,提出了基于故障早期检测的等比直流分量递推故障电流预测算法,从而快速准确地识别短路故障并预测电流过零时刻。基于Compact-RIO短路故障测控系统,在FPGA上将故障早期检测的等比直流分量递推故障电流预测算法予以技术实现,采用函数/任意波形发生器进行仿真模型与动模实验室短路电流数据验证,结果表明:算法故障识别时间在1 ms以内,过零点预测的误差在0.5 ms以内,在一定程度上提高了相控开断技术的快速性和准确性,为相控分断故障电流争取了较为可观的时间。

In order to realize the interruption technology,a geometric dc component recursion prediction algorithm based on fault current early detection was put forward to recognize the fault current and detect the zero moment of the short circuit current rapidly and accurately.The algorithm was realized on the FPGA in Compact-RIO fault current control system.Verifying simulation model and dynamic simulation laboratory short-circuit current data by the function/arbitrary waveform generator,results showed that the time of fault recognition in less than 1ms and the error of zero-cross point prediction was less than 0.5ms.The algorithm improves the speed and accuracy of the phase-controlled switching technology in a certain extent,which provided a considerable time.