High voltage high powder double-tuned method for electric deicing of overhead power transmission line

Abstract

The invention relates to a high voltage high powder double-tuned method for electric deicing of an overhead power transmission line, comprising the following steps: a second inductor (L2) and a second capacitor (C2) are connected in parallel to form a resonant circuit; then a first resonance capacitor (C1) and the resonant circuit are connected in series between a line deicing power source (E) and an overhead power transmission line (1) to form a double-tuned line electric deicing heating loop; the line deicing power source (E) outputs high frequency voltage with two different frequencies to cause the double-tuned electric deicing heating loop to generate high frequency resonance current with two different frequencies to form two purely resistive resonance electric deicing heating loops; and the electric heating line realizes fast deicing and maximizes the capacity of the line deicing power source (E).The method of the invention has the advantages of high deicing efficiency, fast deicing and capacity of maximizing capacity of a high voltage high powder power electronic frequency conversion resonance device, thus being suitable for deicing the single phase and triphase transmission line and enjoying strong enablement.

Description

technical field [0001] The invention relates to a high-voltage and high-power double-tuning electric deicing method for an overhead transmission line. It belongs to the field of power system security. Background technique [0002] my country is one of the countries with the most severe icing on transmission lines in the world. Severe icing will lead to a sharp decline in the mechanical and electrical performance of transmission lines, resulting in icing accidents. Among the existing deicing techniques, the mechanical and manual deicing method has low efficiency, high risk factor, and long cycle, making it difficult to popularize on a large scale; the method of using new material conductors increases the cost and cannot be promoted very well, especially in In the old line; DC current ice melting method is often to melt ice on two lines at the same time, and it takes a long time to melt ice in the usual three-phase overhead transmission line icing situation, and the operatio...

AI Technical Summary

Problems solved by technology

Severe icing will lead to a sharp decline in the mechanical and electrical performance of the transmission line, resulting in the occurrence of icing accidents

Among the existing deicing techniques, the mechanical and manual deicing method has low efficiency, high risk factor, and long cycle, making it difficult to popularize on a large scale; the method of using new material conductors increases the cost and cannot be promoted very well, especially in In the old line; DC current ice melting method is often to melt ice on two lines at the same time. In the case of icing on the usual three-phase overhead transmission line, it takes a long time to melt ice, and the operation is complicated

The line high-current ice-melting method requires the integrity of the line, and has a high reactive power output, and the ice-melting efficiency is low; a single-tuned frequency conversion resonant short-circuit ice-melting method recently proposed can only produce purely resistive ice at a single resonance point. The resonant circuit is used to improve the heating efficiency of the wires, but the high-frequency harmonics that can be output by the high-voltage and high-power power electronic frequency conversion device are not used to further improve the heating efficiency of the wires, and the skin effect of the transmission line and the device are used to the maximum extent. Rated capacity output active power makes the line heat and melt ice

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