Harmonic measurement device and harmonic measurement method based on windowing interpolation DFT of Hanning window

Abstract

The invention discloses a harmonic measurement device and harmonic measurement method based on windowing interpolation DFT of a Hanning window. The device comprises an ARM module, a Hanning window windowing interpolation module, a power supply module, a switching value module, measurement modules, a display module, a storage module, a data communication module and a control output module. A core module is formed by connecting the windowing interpolation DFT module of a Hanning window with the ARM module; the basic module is composed of the measurement modules, the power supply module, the switching value module, the data communication module, the display module, the storage module and the data control module, and the basic module is connected with the core module; all the modules in the basic module independently coexist and are jointly established to stably operate under the condition that the core module normally works. According to the invention, under the condition of carrying outhuge operation, simultaneous operation of multiple measurement modules is considered, and the advantages of timely data sampling, high accuracy, strong real-time performance and the like are achieved.

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

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