Active power rapid measuring method based on Taylor expansion

• Main Authors: CHEN ZHOU, HU LIANG, SHEN FENGWEN, ZHANG JUNHAO, ZHANG ZHENG, LI FUHAI, GUO SIYU, JIN RAN, TENG ZHAOSHENG, WEN HE, DAI HUIFANG, MENG ZHUO
• Format: Patent
• Language: English
• Published: 01.04.2015
• Subjects: MEASURING; MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES; PHYSICS; TESTING

The invention discloses an active power rapid measuring method based on Taylor expansion. The method mainly includes the following steps that firstly, discrete sampling is conducted on power grid continuous voltage and current signals to obtain N-point sampling sequences Yu(n) and Yi(n); secondly, a windowing coefficient matrix W is established by applying a window function, Yu(n) and Yi(n) are processed, and windowing signal matrixes Ywu and Ywi are obtained; thirdly, a coefficient matrix T is established by means of the Taylor formula and the least square method; fourthly, a voltage or current calculation result matrix g based on first-order Taylor expansion is worked out through the coefficient matrix T and the windowing signal matrixes Ywu and Ywi; fifthly, according to the voltage and current calculation result matrixes g, voltage and current base wave phasors are worked out, and finally an active power result P is obtained. According to the method, a matrix calculation model is established through the first-order Taylor expansion, the least square method and the windowing method, the voltage and current base wave phasors can be measured rapidly, interference of harmonic components in active power measurement is reduced, accuracy is high and calculation is simple.