Research on Hybrid AC Sampling Technology in Substation Based on Frequency Threshold

Abstract

Abstract During the operation of the power grid, AC quantity acquisition plays an important role in the power system to convert analog quantity into digital quantity, which is the basis of realizing substation automation. The accuracy and reliability of sampling directly affect the reliability and stability of the whole system. Therefore, this paper studies a hybrid AC sampling technology based on frequency threshold, which is based on the sampling method. The polynomial fitting method is used to restore the power data at the time of the fault point, mainly to judge the frequency change points collected by the system and whether or not the corresponding sampling mode is switched by comparing the frequency change value with the threshold value. Finally, the advantages of the above conclusions are verified by simulation.