Power grid harmonic detection method and power grid harmonic detection device

Abstract

The invention discloses a power grid harmonic detection method and a power grid harmonic detection device, wherein the detection method comprises the following steps: A, sampling, obtaining a continuous signal in a to-be-detected power grid, and converting the continuous signal into a discrete signal; and B, creating a data window, and carrying out window processing on the sampled data, wherein signals in the data window are actual values, and signals outside the data window are all zero. The power grid harmonic detection device provided by the invention is applied to the power grid harmonic detection method, comprises a signal acquisition module, a DSP processing unit, a watchdog module, a power supply module, a memory and a displayer, and has the beneficial effects that a DSP module is applied to the harmonic detection device, so that a hardware part in a harmonic detection system can be simplified; and meanwhile, resources in the hardware part can be reasonably utilized; for ensuring that the DSP module can be normally utilized, a Hall sensor is arranged, and the voltage is converted into the voltage which can be accepted by the DSP module through the Hall sensor.

Description

technical field [0001] The invention relates to the field of grid harmonic detection, in particular to a grid harmonic detection method and a grid harmonic detection device. Background technique [0002] Since the effective component of the AC power grid is a single frequency of the power frequency, any component different from the power frequency can be called a harmonic. Since the sinusoidal voltage is applied to the nonlinear load, the fundamental current is distorted to generate harmonics, and the main nonlinear Loads include UPS, switching power supply, rectifier, frequency converter, inverter, etc. The harm of harmonics is very serious. Harmonics reduce the efficiency of production, transmission and utilization of electric energy, overheat electrical equipment, generate vibration and noise, and cause The insulation is aging, the service life is shortened, and even failure or burnout occurs. Harmonics can cause local parallel resonance or series resonance in the power s...

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Problems solved by technology

[0004] The purpose of the present invention is to solve the problem in the prior art that the grid harmonic detection is not combined with the DSP module, so that the resources in the hardware can be used reasonably, so as to facilitate the modification of the program. Ordinary sensors generally only measure power frequency waveforms and The linearity is not high enough, the lack of self-inspection function, when the system fails, it cannot restart to restore normal operation, and proposes a grid harmonic detection method and a grid harmonic detection device

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