Frequency Measurement Method of Fourier Correction Coefficient

Abstract

The Fourier correction coefficient frequency measurement method of the present invention is a complete set of software detection method for power system frequency, which is composed of Fourier frequency formula with correction coefficient, sampling sequence interpolation formula and iteration method, and deduces the frequency with correction coefficient The Fourier frequency formula and the sampling sequence interpolation formula are proposed, and an iterative calculation method using the two formulas is proposed. Use the interpolation formula to calculate the discrete sequence of the sampling signal, and then calculate the estimated frequency of the discrete sequence of the sampling signal according to the Fourier frequency formula with a correction coefficient, substitute the estimated frequency into the discrete sequence, and use the interpolation formula to calculate a new interpolation sequence for iteration. Several iterations eventually yield a more accurate estimated frequency. The method of the invention has strong filtering characteristics and anti-interference performance, complete and clear algorithm, simple steps and fast calculation speed, and is suitable for real-time frequency monitoring of power systems.

Description

technical field [0001] The invention belongs to the technical field of electric power safety and operation protection, in particular to a Fourier correction coefficient frequency measurement method. Background technique [0002] Frequency deviation is one of the important indicators to reflect power quality. Power system frequency hardware detection is mainly realized by zero-crossing comparator or phase-locked loop. It needs to add hardware detection circuit, but it does not take up processor time. Software detection analyzes sampling signals through algorithms , no hardware circuit is required, but it takes more processor time to ensure good measurement accuracy. At present, there is no software detection method for power system frequency with simple algorithm and high precision. Contents of the invention [0003] The purpose of the present invention is to propose a Fourier correction coefficient frequency measurement method aiming at the deficiencies of the prior art. ...

AI Technical Summary

Problems solved by technology

[0002] Frequency deviation is one of the important indicators to reflect power quality. Power system frequency hardware detection is mainly realized by zero-crossing comparator or phase-locked loop. It needs to add hardware detection circuit, but it does not take up processor time. Software detection analyzes sampling signals through algorithms , no hardware circuit is required, but it takes more processor time to ensure good measurement accuracy. At present, there is no software detection method for power system frequency with simple algorithm and high precision.

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