A Harmonic Measurement Method of Windowed Interpolation DFT Based on Hanning Window

Abstract

A harmonic measurement device and measurement method based on a windowed interpolation DFT of a Hanning window, comprising an ARM module, a windowed interpolation module of a Hanning window, a power supply module, a switch module, each measurement module, a display module, a storage module, and a data Communication module and control output module, wherein the core module is composed of Hanning window interpolation DFT module and ARM module, and the basic module is composed of measurement module, power module, switch module, data communication module, display module, storage module and Composed of data control modules, the basic module is connected to the core module; each module in the basic module coexists independently, and is jointly established to run smoothly under the normal operation of the core module. The invention can take into account the simultaneous operation of multiple measurement modules under the condition of performing huge calculations, so as to achieve the advantages of timely data sampling, high accuracy, strong real-time performance, and the like.

Description

technical field [0001] The invention relates to the technical field of harmonic analysis, in particular to a harmonic measuring device and a measuring method based on a Hanning window-based windowed interpolation DFT. Background technique [0002] With the construction of UHV smart grid and the promotion of new energy, a large number of power electronic equipment with impact, nonlinear and unbalanced characteristics have caused serious pollution to the power quality of the power system and deteriorated the electromagnetic environment of electrical equipment. At the same time, power electronic equipment has higher and higher requirements for power quality due to its high sensitivity and insufficient anti-disturbance ability. In this context, power quality issues have received widespread attention. The key to solving power quality pollution is to solve the harmonic problem of the power grid. Monitoring / testing is the only means to fully control the current situation of power...

AI Technical Summary

Problems solved by technology

[0003] Harmonic analysis of power systems is usually carried out through discrete Fourier transform (DFT). However, during data acquisition, even if the sampling frequency satisfies the Nyquist theorem, if it is not sampled synchronously, it will cause leakage. effect and fence effect, so that the calculated signal parameters such as frequency, amplitude and phase are inaccurate, especially the phase error is very large, so that it cannot meet the requirements of accurate harmonic measurement

Images