Power grid dancing area prediction early warning method and system thereof
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A regional and power grid technology, applied in the field of electrical engineering, can solve problems such as limited guidance on anti-flying work, short warning time, and difficult measurement, so as to improve the technical level of assessment and ensure safety.
Active Publication Date: 2017-05-17
STATE GRID HUNAN ELECTRIC POWER +3
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Problems solved by technology
Current research on galloping early warning is mainly based on on-site galloping monitoring. By monitoring data such as real-time meteorological conditions or line structural stress changes, it provides galloping early warning information for several minutes or hours in the future. Due to the difficulty of on-site measurement, the small measurement range and the short warning time restrictions, limited guidance on actual dance prevention work on site
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Embodiment 1
[0022] This embodiment discloses an early warning method for grid galloping areas, such as figure 1 shown, including:
[0023] Step S1. Acquiring the historical average air pressure in the predicted area and the same period as the predicted time.
[0024] In this step, the area near the transmission line can be subdivided into a plurality of prediction areas in a grid shape of 0.25°×0.25° based on latitude and longitude as the reference unit. For example, for the ice-covered dancing warning of the power grid in winter, the historical average air pressure obtained can be the historical average air pressure P hi .
[0025] Step S2: Obtain forecast wind speeds on two isobaric surfaces adjacent to the historical average air pressure in the forecast area, and determine corrected wind speeds in the forecast area through relevant calculation formulas.
[0026] In this embodiment, the specific calculation formula for correcting wind speed is:
[0027]
[0028] Among them, P hi...
Embodiment 2
[0083] Corresponding to Embodiment 1, this embodiment also discloses a grid galloping area prediction and early warning system, including:
[0084] The data acquisition module is used to obtain the historical average air pressure P of the forecast area and the same period as the forecast time hi , and get the predicted area and the historical average air pressure P hi Two adjacent isobaric surfaces P 1i ,P 2i The forecast wind speed V on 1i , V 2i ;
[0085] The wind speed correction module is used to determine the corrected wind speed V of the forecast area by formula (1) xi ; Wherein the formula (1) is specifically:
[0086]
[0087] The early warning module is used to correct the wind speed V according to the xi Determine the galloping wind speed index of the forecast area, and evaluate the grid galloping warning level of the forecast area according to the galloping wind speed index combined with other early warning indices. Optionally, other relevant early warni...
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Abstract
The invention relates to the electrical engineering technology field and discloses a power grid dancing area prediction early warning method and a system thereof. The method and the system are used to increase a dancing forecast technology level and guarantee power grid safety operation. The method comprises the following steps of acquiring historical average pressure which is in a same period with prediction time in a prediction area; acquiring a forecast wind speed on two barometric surfaces adjacent to the historical average pressure in the prediction area, and through a correlation formula, determining a correction wind speed of the prediction area; according to the correction wind speed, determining a dancing wind speed index of the prediction area; according to the dancing wind speed index and through combining other early warning indexes, evaluating a power grid dancing early warning grade of the prediction area. In the invention, according to the historical average pressure of each prediction area and the forecast wind speed of the adjacent barometric surfaces, forecast wind speed correction is performed so that a wind speed of each prediction area can be accurately forecasted, an evaluation technology level of the power grid dancing early warning grade is increased and power grid safety operation can be ensured.
Description
technical field [0001] The invention relates to the technical field of electrical engineering, in particular to a method and system for predicting and early warning of a grid galloping area. Background technique [0002] Galloping of transmission lines is a major threat to the safe operation of the power grid. It may cause flashover and tripping of the wires, and it may cause serious hazards such as damage to the grid tower fittings, disconnection or even tower collapse. Once the large-scale galloping causes frequent tripping or even disconnection of the line A tower collapse accident will cause a large-scale power outage and affect the safe and stable operation of the power grid. Therefore, the prevention and control of galloping has become a prominent problem in transmission lines that needs to be solved urgently. Current research on galloping early warning is mainly based on on-site galloping monitoring. By monitoring data such as real-time meteorological conditions or l...
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