Distributed optical fiber-based dynamic capacity increasing method and system for overhead transmission line

Abstract

The invention discloses a distributed optical fiber-based dynamic capacity increasing method and system for an overhead transmission line. The distributed optical fiber-based dynamic capacity increasing system for an overhead transmission line comprises a Rayleigh scattering phase decoupling module which obtains a Rayleigh backward scattering light signal; a Raman scattering module which is used for obtaining a Stokes light signal and an anti-Stokes light signal; an optical signal demodulation module which is used for calculating the vibration frequency of an OPGW according to the Rayleigh back scattering light signal and calculating the environment wind speed, and calculating the external environment temperature of the OPGW according to the Stokes light signal and the anti-Stokes light signal; and a current-carrying calculation module which is used for calculating the maximum bearing current magnitude of the overhead transmission line according to the environment wind speed, the environment temperature, the sunlight intensity and the maximum allowable temperature of the overhead transmission line. According to the distributed optical fiber-based dynamic capacity increasing method and system for the overhead transmission line, the accuracy of dynamic capacity increasing can be improved, and the cost is saved.

Description

technical field [0001] The power grid technology of the embodiment of the present invention particularly relates to a method and system for dynamically increasing the capacity of overhead transmission lines based on distributed optical fibers. Background technique [0002] Due to the resistance of the transmission line, when the load current is transmitted, a part of the electric energy will be converted into heat energy consumption and cause the wire to heat up. When the temperature of the transmission wire exceeds the maximum allowable operating temperature, the wire will be burned. With the rapid growth of the national economy and the surge in electricity consumption, the transmission capacity of some overhead lines is currently limited by the thermal stability of the line, and sometimes it is difficult to meet the transmission capacity requirements of the power grid, which seriously restricts the rational dispatch and stable operation of the power grid. However, the inve...

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Problems solved by technology

However, this system contains a lot of equipment, high cost, maintenance requires a lot of manpower and material resources, and the reliability is difficult to guarantee; some scholars have proposed the method of combining dynamic capacity expansion and congestion analysis to selectively increase the capacity of specific easy-to-congestion lines. The data provided by the Meteorological Bureau determine the safety capacity and time period that can be increased on the line, but the micro-meteorological conditions where the line is located may change drastically, posing safety hazards

Some scholars have proposed a dynamic and static capacity-increasing method, which can flexibly determine the ampacity by combining meteorological data and sag calculations, but there is a risk of large data fluctuations in this method

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