Research on High Precision Adaptive Phasor Measurement Algorithm Based on Taylor Series and Discrete Fourier Transform

• Published in: Robotics and Rehabilitation Intelligence pp. 420 - 433
• Main Authors: Wang, Guangfu, Guan, Huanxin, Jin, Peng, Zhao, Yan
• Format: Book Chapter
• Language: English
• Published: Singapore Springer Singapore
• Series: Communications in Computer and Information Science
• Subjects: Adaptive phasor algorithm; Discrete Fourier transform; New energy grid; Phasor measurement
• ISBN: 9789813349285; 981334928X
• ISSN: 1865-0929; 1865-0937
• DOI: 10.1007/978-981-33-4929-2_29

The application of HVDC power transmission, flexible ac power transmission and large-scale grid connection of new energy have introduced a large number of power electronic equipment to the power grid. This results in frequent subsynchronous oscillations, and the harmonic disturbance of power grid presents a broadband trend, which seriously affects the accuracy of phasor measurement. To solve the problem that the traditional phasor algorithm can not satisfy the demand of precision and speed in the dynamic process, this paper proposes a comprehensive adaptive phasor algorithm based on Taylor series and discrete Fourier transform (DFT). For steady state and dynamic state, the time domain algorithm and the frequency domain algorithm are designed respectively. Specifically, the time-domain algorithm USES two adjacent data Windows for DFT analysis, and is simplified according to specific accuracy requirements to calculate the frequency and phasor. The Taylor series expansion of the power signal model is carried out by the frequency domain algorithm, and the phasor, frequency and frequency change rate are calculated by the fundamental wave and each harmonic content of a data window. Finally, simulation analysis and experimental test results show that the measurement accuracy and response performance of the proposed algorithm are better than that of the traditional algorithm and the corresponding commercial synchronous phasor measuring device in both steady state and dynamic state, and meet the practical application requirements.