High-voltage and high-power double-tuning electric deicing method for overhead transmission lines

Abstract

A high-voltage, high-power double-tuning electric deicing method for overhead transmission lines: the output of a high-voltage, high-power power electronic frequency conversion resonance device includes two high-frequency voltages of different frequencies, so that two resonance capacitors in series with the transmission line and a parallel LC resonance circuit are generated. A high-frequency resonant current with different frequencies can be used to heat the ice-coated transmission line. Since two high-frequency currents of different frequencies are passed into the ice-coated transmission line, the skin effect of the transmission line can be greatly increased, and the equivalent resistance of the corresponding line will increase. Under the condition of generating the same ice-melting power, the melting of the line The ice current is reduced, reducing the harm of line overcurrent. The method of the invention has the advantages of high ice-melting efficiency, fast deicing time, and can maximize the use of the capacity of the high-voltage, high-power power electronic frequency conversion resonant device, and is suitable for melting ice of single-phase and three-phase transmission lines, and has strong implementability and broad application potential. Its application prospects can produce huge economic and social benefits.

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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