Harmonic detection method and device for power transmission network and medium
A harmonic detection and transmission network technology, applied in the field of power system, can solve the problem of transient harmonic signal detection in unsuitable power grid signals, power system harmonic research methods are no longer fully applicable, and amplitude and phase information cannot be accurately obtained. and other problems to achieve the effect of compensating for the decomposition scale and unintuitiveness, fast speed, and intuitive results
Inactive Publication Date: 2020-09-22
ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD +1
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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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[0054] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.
[0055] see figure 1 , is a schematic flowchart of steps of a method for detecting harmonics in a transmission network provided in Embodiment 1 of the present invention. The harmonic detection method of the transmission network described in Embodiment 1 of the present invention is executed through steps S1 to S5:
[0056] S1. Obtain the original signal of the transmission network, and establish a harmonic signal model.
[0057] Specifically, the embodiment of the ...
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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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IPC IPC(8): G01R23/165
CPCG01R23/165
Inventor 吴为洪潮曾德辉赵睿
Owner ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD
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