Current-carrying limiting value estimation method of overhead transmission line

Abstract

The invention discloses a current-carrying limiting value estimation method of an overhead transmission line. The current-carrying limiting value estimation method of the overhead transmission line comprises the steps that (1) a movable camera arranged on the lowest point of an overhead conductor between two towers is used for obtaining the conductor sag; (2) the tensioning force of the conductor is calculated according to the obtained conductor sag; (3) the actual temperature of the conductor is obtained according to the tensioning force of the conductor, the real-time current-carrying amount of the conductor and the environment wind speed; (4) the real-time maximum current-carrying amount of the conductor is estimated according to the actual temperature of the conductor and the obtained environment parameters. According to the current-carrying limiting value estimation method of the overhead transmission line, the actual temperature of the conductor is indirectly obtained by obtaining the conductor sag, the temperature accuracy is far higher than that of a current method that the temperature is directly read by a temperature sensor, and therefore the real-time maximum current-carrying amount of the overhead transmission line can be accurately estimated. The quite important data accuracy of a transmission line dynamic capacity-increasing system serving as an important part of a supporting system of the intelligent transmission line technology in an intelligent power grid is achieved and is greatly significant for safety and efficiency of power transmission and electricity market transactions.

Description

technical field [0001] The invention relates to a method for evaluating the real-time maximum carrying capacity of a transmission line, in particular to a method for evaluating the real-time maximum carrying capacity of an overhead transmission line. Background technique [0002] my country is currently in a period of rapid development of the power system. On the one hand, due to the constraints of capital, land, environmental protection and many other conditions, it is more difficult to acquire land for transmission corridors. Line corridors are increasingly becoming scarce resources, and it is becoming more and more difficult to build new lines. In-depth research is urgently needed to fully utilize the transmission capacity of the power grid; on the other hand, after the emergence of the power market and transshipment, power transmission capacity is not only a technical indicator of the power grid, but also a market signal reflecting the power transmission capacity of the po...

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Problems solved by technology

Because the wind speed changes greatly along the wire, the temperature of the wire varies greatly along the wire, and the measured temperature at a certain point of the wire cannot represent the average temperature of the w

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