A method for analyzing pmu measurement error under the influence of low frequency oscillation

Abstract

The invention discloses a PMU measurement error analysis method under the influence of low-frequency oscillation, including step 1: establishing a power signal model under low-frequency oscillation; step 2: constructing a PMU measurement method, and the phasor measurement device PMU is obtained by Fourier transform Phasor expression, transform the phasor form of the signal into a complex form through Euler's formula, calculate the real part error factor and imaginary part error factor of the phasor measurement value under the amplitude oscillation, and obtain the phasor under the amplitude oscillation Measurement error expression; Step 3: Obtain the phasor measurement error expression in the case of phase angle oscillation; Step 4: Obtain the phasor measurement error expression in the case of simultaneous amplitude and phase angle oscillation; Step 5: Use the above obtained The phasor measurement error expression performs quantitative PMU measurement error calculations. The invention solves the problems that the online PMU measurement error cannot be quantitatively calculated and the mechanism analysis is insufficient under the existing low-frequency oscillation, and the error expression is obtained for calculation.

Description

technical field [0001] The invention relates to the technical field of power system dynamic phasor measurement, in particular to a PMU measurement error analysis method under the influence of low-frequency oscillation. Background technique [0002] With the large-scale development of Internet projects in various regions of my country and the large-scale grid connection of various distributed power sources, my country has formed one of the few ultra-large-scale complex power grids in the world. While grid interconnection has brought significant benefits, due to the large-scale access of new power electronic devices and the widespread use of high amplification and fast excitation technologies, some abnormal dynamic behaviors of power grids that have not been reported before at home and abroad have gradually emerged. As one of the ubiquitous extreme working conditions, low-frequency oscillation causes dynamic changes in the amplitude and phase angle of the power signal, accompa...

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is the problem that the PMU measurement error cannot be quantitatively calculated and the mechanism analysis is insufficient under the existing low-frequency oscillation; the present invention provides a PMU measurement error analysis method under the influence of low-frequency oscillation to solve the above problems, The present invention utilizes the advantages of discrete Fourier transform due to its lower calculation amount and harmonic suppression as a synchronized phasor measurement method applied to PMU measurement under the influence of low-frequency oscillation, and clarifies the PMU measurement error under the influence of low-frequency oscillation The generation mechanism solves the problems that the PMU measurement error cannot be quantitatively calculated and the mechanism analysis is insufficient under the existing low-frequency oscillation, and the error expression is obtained

Images