Overhead transmission line galloping state online prediction method and system
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A transmission line and status technology, applied in the field of electrical engineering, can solve problems such as difficult to accurately predict the galloping situation and unbalanced sample data, and achieve the effect of improving the unbalanced prediction of sample data and improving accuracy
Pending Publication Date: 2021-08-10
CHINA ELECTRIC POWER RES INST +2
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[0003] Aiming at the problem in the prior art that the galloping state prediction of overhead transmission lines is easily affected by the imbalance of sample data, and it is difficult
Method used
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Embodiment 1
[0043] Aiming at the problem in the prior art that the sample data used for prediction is unbalanced due to the inability to obtain knowledge from the actual situation in time for subsequent prediction, the present invention provides an online prediction method for the galloping state of overhead transmission lines, such as figure 1 shown, including:
[0044] Step 1. Obtain meteorological data around the transmission line at the time to be tested, as well as the ice thickness, direction angle, wind direction angle, and vibration amplitude of the transmission line;
[0045] Step 2: Input the meteorological data around the transmission line at the time to be measured, as well as the icing thickness, direction angle, wind direction angle, and vibration amplitude of the transmission line as input data into the pre-built online galloping prediction model of the transmission line, and predict the transmission line State information of the line at the time to be tested;
[0046] Whe...
Embodiment 2
[0068] Based on the same inventive concept, the present invention also provides an online prediction system for the galloping state of overhead transmission lines, such as image 3 shown, including:
[0069] The data acquisition module is used to acquire meteorological data around the transmission line at the moment to be measured and the ice thickness, direction angle, wind direction angle, and vibration amplitude of the transmission line;
[0070] The state prediction module is used to input the meteorological data around the transmission line at the time to be measured and the icing thickness, direction angle, wind direction angle, and vibration amplitude of the transmission line as input data into the pre-built transmission line galloping online prediction model, Predicting and obtaining the state information of the transmission line at the time to be tested;
[0071] Wherein, the transmission line galloping online prediction model is based on the nearest neighbor algorit...
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Abstract
The invention discloses an overhead transmission line galloping state online prediction method and system. The method comprises that: meteorological data around a transmission line at a to-be-measured moment and the icing thickness, the direction angle, the wind direction angle and the vibration amplitude of the transmission line are obtained; the meteorological data around the power transmission line at the to-be-measured moment and the icing thickness, the direction angle, the wind direction angle and the vibration amplitude of the power transmission line serve as input data to be input into a pre-constructed power transmission line galloping online prediction model, and state information of the power transmission line at the to-be-measured moment is obtained through prediction; the power transmission line galloping online prediction model is constructed based on a nearest neighbor algorithm by taking historical meteorological data around a power transmission line and historical icing thickness, direction angle, wind direction angle, vibration amplitude and state information of the power transmission line as initial neighbors; and historical data closest to the data input time is obtained by using a preset sliding window to perform updating training. The updating of the prediction sample is realized, and the accuracy of galloping state prediction is improved.
Description
technical field [0001] The invention relates to the technical field of electrical engineering, in particular to an online prediction method and system for the galloping state of an overhead transmission line. Background technique [0002] Overhead transmission lines may experience large vibrations in cold, icy and windy environments, commonly known as galloping. Line galloping can cause tripping, loose bolts, and even the collapse of transmission towers. Once the collapse causes a short circuit, it will cause a large-scale blackout of the entire power grid. In extreme weather, power outages can cause problems such as water supply and heating. At present, the early warning research on galloping is mainly divided into two aspects: the analysis of the physical mechanism of line galloping and the data-driven galloping detection. The most classic galloping physical model can be traced back to the vertical excitation mechanism proposed by Den Hartog in 1932 and the torsional vi...
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