A Method for Optimizing Breaking Locations of Medium Voltage Feeders Based on Load Moment Margin

Abstract

The invention relates to a load moment margin-based medium-voltage feeder breaking position optimization method. The method comprises the steps of simplifying a network frame topology structure into a single radiation topology type that all loads are intensively distributed and mounted on a trunk line; formulating breakpoint alternative schemes by combining planed substation locations and a feeder network topology; selecting the model number of the line with the maximum line diameter in the trunk line as the feeder baseline type, calculating feeder load moment values at two sides in the most serious working condition under various schemes respectively and comparing the load moment values with a load moment threshold under a power factor corresponding to the baseline type to obtain the total load moment margin after the corresponding scheme is implemented; and finally, selecting the scheme with the maximum total load moment margin as a recommended breakpoint according to the comparison result of the total load moment margins of the alternative schemes. According to the load moment margin-based medium-voltage feeder breaking position optimization method, a distribution network designer conveniently looks for an optimal breaking scheme by combining the network frame topology and the load space distribution condition; an enough growth margin is reserved for development of each regional load when the problem of low voltage at the tail end of the line is solved; and resource waste caused by repeated construction in the near future is avoided.

Description

technical field [0001] The invention relates to a method for selecting a disconnection position of a medium-voltage feeder, in particular to a method for optimizing the disconnection position of a medium-voltage feeder based on a load moment margin. Background technique [0002] In recent years, benefiting from policies that benefit the people such as "home appliances to the countryside", the quality of life of residents has been significantly improved, and higher requirements have been placed on the power supply capacity and quality of power distribution networks; however, with the rapid growth of the use of various electrical appliances, some When the power supply radius of the medium-voltage feeder is less than 15km, the "low voltage" problem still occurs at the end, which affects the daily production and living electricity consumption of residents. For long lines with power supply problems, power grid companies consider disconnecting feeders with power supply problems an...

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Problems solved by technology

[0004] The purpose of the present invention is to overcome the deficiencies of the prior art, and provide a method based on the actual medium voltage feeder network topology and load space distribution, analyze the load moment margin of each proposed breaking scheme, to solve the problem caused by the long power supply line. A medium-voltage feeder disconnection position optimization method based on load moment margin, and reserve load margin to adapt to planned user access and surrounding load development

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