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Harmonic measurement method and device for power transmission network

A measurement method and transmission network technology, applied in the field of power system, can solve the problems that the real-time requirements of harmonic measurement cannot be met, and the sampling and calculation time are not reduced.

Pending Publication Date: 2020-09-22
ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD +1
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Problems solved by technology

At present, the algorithm based on Fourier transform can reduce the harmonic measurement error caused by spectral side leakage and fence effect through the improvement of windowing and interpolation, but the sampling and calculation time of the algorithm have not been reduced, which cannot meet the requirements of harmonic measurement. real-time requirements

Method used

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  • Harmonic measurement method and device for power transmission network
  • Harmonic measurement method and device for power transmission network
  • Harmonic measurement method and device for power transmission network

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Embodiment Construction

[0065] 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.

[0066] see figure 1 , is a schematic flowchart of steps of a method for measuring harmonics of a transmission network provided in Embodiment 1 of the present invention. The method for measuring harmonics of the transmission network described in Embodiment 1 of the present invention is performed through steps S1 to S6:

[0067] S1. Sampling the original signal in the transmission network at equal time intervals to obtain a sampling signal sequence.

[0068] Specif...

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Abstract

The invention discloses a harmonic measurement method for a power transmission network, and the method comprises the steps: carrying out the all-phase Fourier operation of a sampling signal sequence of the power transmission network, so as to obtain target harmonic phase information; and according to the target harmonic phase information, constructing a wavelet neural network for calculating and outputting harmonic amplitude information; wherein the number of iterations is within a preset maximum iteration number range; and calculating a target error function value of the wavelet neural network by adjusting preset parameter information of the wavelet neural network until the target error function value of the wavelet neural network meets a preset error requirement, and obtaining harmonic amplitude information currently output by the wavelet neural network as target harmonic amplitude information of the power transmission network. The embodiment of the invention further discloses a corresponding harmonic measurement device. By adopting the embodiment of the invention, the advantages of Fourier transform, wavelet transform and a neural network algorithm are combined, and the accuracy, high efficiency and robustness of the harmonic measurement method are effectively improved, so that the harmonic monitoring application requirements of the power transmission network are met, and the safe and stable operation of the power transmission network is improved.

Description

technical field [0001] The invention relates to the technical field of power systems, in particular to a method and device for measuring harmonics of a transmission network. Background technique [0002] HVDC technology has the advantages of low cost, low loss, high adjustability and reliability, and has been widely used in many power grid fields. The core power electronic device of the HVDC transmission system is the converter, which generally consists of 6 or 12 bridge arms (converter valves), so the number of thyristors required for a DC transmission project is huge, generally thousands or more . As a nonlinear power electronic component, the converter will inevitably generate various harmonics during operation, and the existence of these harmonics will seriously endanger the safe and reliable operation of the power grid. [0003] In the existing technology, the harmonic measurement method based on Fourier transform (FFT) is the most widely used harmonic detection metho...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R23/16
CPCG01R23/16
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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