The analysis of frequency deviation on synchrophasor calculation and correction methods

This paper gave a brief introduction of Phasor Measurement Unit (PMU) in the Wide Area Measurement System (WAMS) of power systems, and studied the error characteristics of the discrete Fourier calculation of phasor in the condition of a sinusoidal signal with frequency deviation from nominal frequency. Then, a program calculated the phasor using discrete Fourier transform under the platform of MATLAB was implemented, and the simulating analysis of off-nominal frequency was studied in detail. The simulating results showed that the error characteristics of calculated phasor had taken on the error ellipse shape. Finally, several methods of error correction were introduced for calculating the accurate phasor in power systems.