Power distribution network reliability analysis method and device

Abstract

The present invention relates to a power distribution network reliability analysis method and device and belongs to the electric power technical field. The method includes the following steps that: the original data of a meteorological environment in a first time period are acquired, and m dynamic thermal constant values of the power distribution network are calculated sequentially according to a calculation period; whether the working state of each transmission line of the power distribution network at detection time changes is judged; if the working state of each transmission line of the power distribution network at the detection time changes once, power outage data are updated according to the time sequence of the working state of the transmission lines of the power distribution network: the dynamic thermal constant values of the transmission lines of the power distribution network in the detection time are determined according to the detection time and the m dynamic thermal constant values, the power flow of the power distribution network is calculated according to the determined dynamic thermal constant values, and the related power outage data of each load point are updated according a power flow calculation result; and the reliability index of the power distribution network is obtained according to the related power outage data of the load points, and the reliability index is outputted.

Description

technical field [0001] The invention relates to the field of electric power technology, in particular to a reliability analysis method and device for a distribution network. Background technique [0002] The distribution network is at the end of the power system to directly supply and distribute electric energy to users. Due to the simultaneous characteristics of power generation, supply, and consumption, once the distribution network fails, it will simultaneously cause the interruption of the distribution network's power supply to users. After the fault of the distribution network is repaired or eliminated, the distribution network can continue to supply power to users. The power supply capacity and power supply quality of the power system to users need to be reflected through the distribution network. Therefore, the reliability of the distribution network is particularly important. [0003] The transmission ampacity of overhead lines is an important factor affecting the ...

AI Technical Summary

Problems solved by technology

At present, the static thermal rating of the transmission line of the overhead line is used as the limitation of the carrying capacity of the transmission line in the reliability analysis of the distribution network, while the traditional static thermal rating does not consider the actual operating environment of the transmission line, and adopts standard, solidified, Calculate the maximum allowable current carrying capacity of the transmission line with a combination of harsh meteorological parameters (such as wind speed 5m / s, ambient temperature 40°C)

This calculation method is more practical under the condition of limited computing power and available meteorological data in the past, but with the improvement of computing level and meteorological data acquisition technology, it is increasingly impossible to consider the static thermal value of the actual operating environment of the transmission line. Accurately reflect the limitation of the carrying capacity of the transmission line, making the reliability analysis results of the distribution network more and more inaccurate

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