Transmission line dynamic capacity increase method based on environmental change probability model

Abstract

The invention relates to a transmission line dynamic capacity increase method based on an environmental change probability model. Based on analysis of the influence of actual climate on the transmission capacity of transmission lines, a probability model of the dynamic capacity increase method based on a current density function is built, wherein the influence of environment temperature and wind speed is mainly considered. According to the transmission line dynamic capacity increase method based on an environmental change probability model put forward by the invention, the historical running climate environment of transmission lines can be fully utilized, and the cost can be reduced by reducing the number of on-line monitoring equipment; and under the condition of ensuring the power supply reliability of lines, the carrying capacity of transmission lines can be appropriately increased, a guiding role can be played for the actual current running state, and the transmission potential of transmission lines can be fully mined.

Description

technical field [0001] The invention relates to the field of dynamic capacity increase of transmission lines, in particular to a method for dynamic capacity increase of transmission lines based on an environment change probability model. Background technique [0002] With the increase of national industrial production capacity and the improvement of people's quality of life, the power of electrical equipment and equipment power in production and life has increased significantly, and power consumption has maintained a high growth rate. The transmission capacity of the power grid has become a bottleneck restricting the development of the power industry. Most transmission lines are restricted by the thermal stability limit of current carrying capacity, which is far from meeting the actual needs of the power grid. However, my country's power system is in a stage of great development. On the one hand, the transmission capacity of existing transmission lines is insufficient, and u...

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Problems solved by technology

[0004] There are four main monitoring methods for dynamic capacity increase technology. 1) Dynamic capacity increase technology based on climate monitoring. Although this method is economical and easy to expand, due to the difference in microclimate in each region, this solution cannot be applied to longer lines 2) The dynamic capacity-increasing technology based on the direct measurement of wire temperature, this method has higher accuracy than the climate monitoring method, but the use of a large number of temperature measurement equipment makes the system cost high, and the temperature acquisition equipment along the line Installation and maintenance need to invest a lot of manpower and material resources; 3) The dynamic capacity increase technology based on direct sag measurement is relatively accurate and effective in the measurement of dynamic capacity increase technology, but this method of monitoring line sag is not automatic and requires Manual sag measurement and adjustment of measuring points is limited by limited human resources, often the number of sag measurement points is small, and the implementation cost is high due to factors such as corona interference, so the practicability is not strong; 4) based on Dynamic capacity increase technology based on tension measurement, this dynamic capacity increase scheme based on tension measurement not only effectively avoids pollution flashover problem, but also has high economy

However, this kind of scheme needs to be cut off for a long time in the implementation stage, and there are often large errors in the estimated value of the line temperature in high temperature weather

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