Harmonic detection method and device for power transmission network and medium

Abstract

The invention discloses a harmonic detection method for a power transmission network, and the method comprises the steps: obtaining an original signal of the power transmission network, and building aharmonic signal model; separating a low-frequency harmonic component and a high-frequency harmonic component in the harmonic signal model by using a multi-resolution analysis method; calculating thelow-frequency harmonic component by adopting a windowed spectral line interpolation Fourier algorithm to obtain the frequency, amplitude and initial phase of each low-frequency harmonic component of the power transmission network; and calculating the high-frequency harmonic component by adopting a Prony algorithm to obtain the frequency, the amplitude, the initial phase and the attenuation factorof each high-frequency harmonic component of the power transmission network, thereby obtaining each harmonic component parameter of the power transmission network. The invention further discloses a corresponding harmonic detection device and a medium, and by adopting the embodiment of the invention, the accuracy of detecting each harmonic parameter in the power transmission network can be effectively improved so as to meet the harmonic monitoring application requirements of the power transmission network.

Description

technical field [0001] The invention relates to the technical field of power systems, in particular to a harmonic detection method, device and medium of a transmission network. Background technique [0002] The power system will inevitably produce various harmonics during operation, which seriously affects the safe and reliable operation of the power grid. Therefore, the research on the harmonic detection method of the transmission network has attracted extensive attention. The bandwidth of the harmonics of the power system is greatly widened and presents tight frequencies. It can be seen from the harmonic characteristics of the power grid that the frequency of the stationary harmonic signal is low and the attenuation degree is slow; while the frequency of the transient harmonic signal is high and the higher the frequency, the faster the attenuation speed, mainly showing an exponential attenuation characteristic. In the transmission grid, the harmonic components within the ...

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Problems solved by technology

However, in the process of implementing the present invention, the inventors found that there are at least the following problems in the prior art: the windowed spectral line interpolation FFT algorithm cannot detect the harmonic attenuation factor, and the amplitude and phase cannot be accurately obtained when the harmonic is attenuated information, this method is not suitable for the detection of transient harmonic signals in power grid signals

In order to better fit the actual grid signal, the traditional power system harmonic research method is no longer fully applicable

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