Method for judging sinusoidal signal equal-interval synchronous sampling based on amplitude-phase difference

• Main Authors: XU JIYONG, LIU JIABING, WANG BING, MIAO YITONG, LU CHONG, YE QI, LI XIAOFANG, RAO YONGJIE, LI SUOKUN, ZHANG HUILING, WU XUESONG, SHIM JONG-WOO, YAN JIALIANG, SHIROMI, LI ZHIWEI, ZHOU LEI, DUAN ZHIYUN, PENG GENGDU, CUI JUN, WANG WEIGANG, SHU HEPING, BAO YOUZHI, DONG HAO, DAI XIAO, QIN GUANGXING, HE DEQIANG, HUANG JING, YIN JUNWU
• Format: Patent
• Language: Chinese; English
• Published: 27.10.2023
• Subjects: CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTINGELECTRIC POWER; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER; ELECTRICITY; GENERATION; MEASURING; MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES; PHYSICS; SYSTEMS FOR STORING ELECTRIC ENERGY; TESTING

The invention relates to the technical field of power control and protection, in particular to a method for judging sinusoidal signal equal-interval synchronous sampling based on amplitude and phase difference. Comprising the following steps: sampling a sinusoidal signal at equal intervals, and carrying out discrete Fourier transform on an obtained discrete signal; carrying out interlaced point extraction on the sampled discrete signal, and then carrying out discrete Fourier transform; carrying out amplitude and phase difference calculation, and taking whether the phase difference is zero as a criterion for judging equal-interval synchronous sampling of sinusoidal signals; and the positive offset or the negative offset of the frequency offset and the size of the frequency offset are calculated so as to play a guiding role in frequency tracking. The method can simply and directly judge whether synchronous sampling is performed or not, data analysis is accurate, the problem of inaccurate data acquisition is sol