Line temperature segmentation estimation method considering meteorological distribution characteristics

Abstract

The invention discloses a line temperature segmentation estimation method considering meteorological distribution characteristics. The method comprises the steps of obtaining electrical parameters andmaterial parameters of a to-be-measured power transmission line, real-time electrical quantity measurement data at each original node and meteorological quantity measurement data at the to-be-measured power transmission line; adding virtual nodes to the power transmission lines between the original nodes according to the collected meteorological measurement data, wherein the corresponding power transmission lines are segmented, and an electrical transmission matrix of each segment of power transmission line is calculated; calculating virtual electrical quantity measurement data correspondingto each virtual node according to the electrical transmission matrix of each section of power transmission line; forming a quantity measurement matrix by using the real-time electrical quantity measurement data and the virtual electrical quantity measurement data, and selecting voltages and line temperatures of all nodes to form a state quantity matrix; calculating the temperature of each sectionof the to-be-measured power transmission line according to the electrical parameters and the material parameters of the to-be-measured power transmission line, the quantity measurement matrix and thestate quantity matrix. The method greatly improves the estimation precision and real-time performance, is high in calculation efficiency, and is good in numerical stability.

Description

technical field [0001] The invention relates to the field of temperature estimation of transmission lines, in particular to a segmental estimation method of line temperature considering meteorological distribution characteristics. Background technique [0002] Transmission line temperature is an important index to evaluate the transmission capacity of transmission line. The temperature change of transmission line can directly and quickly reflect the real-time load and thermal stability of the line, and then can be used as an important basis for dynamic capacity increase of the line. At present, the technologies for temperature monitoring of transmission lines at home and abroad are mainly divided into two categories: [0003] The first category is to use physical means to measure line temperature. The line temperature is measured by installing temperature sensors, infrared sensors, etc., and then converted into digital signals through the chip, and transmitted to the transm...

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Problems solved by technology

[0005] However, compared with temperature measurement using temperature measuring devices, the estimation accuracy of this method is lower, and it is greatly affected by factors such as line parameter errors, measurement device errors, and complex meteorological conditions.

Moreover, when mathematical methods are used to estimate the line temperature, the line model often adopts a π-type lumped parameter model, which does not consider the difference in meteorological conditions along the line, nor does it consider the line segmentation, which is not consistent with the actual situation; in addition, the existing methods cannot Calculating the dynamic change process of line temperature can only calculate the steady-state temperature of the line, which often has no practical application value

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