Method and device for measuring fundamental frequency of power system

• Main Authors: WANG CHENQING, LIN JINJIAO, ZHOU QI, XU SHUDI, KONG XIANGPING, ZHENG MINGZHONG, LI PENG, GAO LEI, ZHENG JUNCHAO, YUAN YUBO, YE ZHIGANG, BU QIANGSHENG, BIN ZIJUN, TAO YAN, YANG YI
• Format: Patent
• Language: Chinese; English
• Published: 01.03.2024
• Subjects: MEASURING; MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES; PHYSICS; TESTING

The invention discloses an electric power system fundamental wave frequency measurement method and device, and the method comprises the steps: obtaining a voltage signal of a target electric power system, and carrying out the band-pass filtering of the voltage signal; taking the rated frequency as the reference frequency, repeating the following steps until a preset number of times is reached, and outputting the finally calculated fundamental frequency of the target power system: fitting the relative rotation phasor of the filtered voltage signal by adopting a polynomial, and approaching the filtered voltage signal; constructing a linear equation set, and solving a fitting coefficient of a polynomial by using a least square method to obtain a relative rotation phasor and a derivative thereof; according to the relative rotation phasor and the derivative thereof, calculating the fundamental frequency of the target power system by adopting a circular motion trajectory equation; taking the calculated fundamental