Method for evaluating the maximum power supply capacity of 220kv self-healing ring network

Abstract

The invention provides a method for evaluating maximum power supply capability of a 220kV self-healing looped network. The method includes the steps: acquiring a grid structure of the 220kV self-healing looped network, determining the number of network nodes and the number of branches, numbering the nodes and the branches of the grid structure, and reading grid structure parameters, load parameters and voltage amplitude values and phase angles of balance nodes; extending preset population individuals to obtain an initial population; checking the trend of the ground state of a 220kV handle grid and the failure state of the branches N-1 according to a preset Newton-Raphson method and updating the population according to checking results; evolving the population according to a preset differential evolution method to obtain an optimal population, restoring the optimal population into load information, and outputting a maximum power supply capability load scheme to obtain the ground state of the maximum power supply capability load scheme and the loading rate of lines in expected accidents. The method is high in processing speed, and the obtained maximum power supply capability of the looped network is high in accuracy and reliability.

Description

technical field [0001] The invention relates to the technical field of grid power supply capability, in particular to a method for evaluating the maximum power supply capability of a 220kV self-healing ring network. Background technique [0002] The urban power grid is an important part of the entire power system, usually as the last link of the power network branch, and takes on the important task of connecting users. The urban power grid itself has a certain degree of hybridity, which undertakes both transmission and distribution functions. Therefore, the urban power grid is generally composed of a transmission network (also known as the main network) and a distribution network. The voltage level of each distribution network is not fixed, and it will change accordingly when the scale of the power grid expands. As the urban grid load increases year by year, the scale of the grid is also gradually expanding. Taking the 220kV grid as an example, in some relatively developed ...

AI Technical Summary

Problems solved by technology

[0008] 1) The load distribution scheme is determined by the experience of the staff, which is highly subjective, and often requires a lot of repeated checks, which is time-consuming and laborious;

[0009] 2) It is impossible to accurately grasp the maximum power supply capacity of the urban power grid, which makes planners blind when expanding or transforming the power grid;

[0010] 3) In order to give priority to the safe and stable operation of the power grid, a higher capacity-to-load ratio is often used, so that the economy of the power grid operation cannot be improved;

[0011] 4) From the perspective of power grid resource utilization, there is a certain waste

[0012] To sum up, the 220kV power grid load distribution scheme in the traditional technology has great subjectivity, its processing process is complicated, and the accuracy and reliability of the maximum power supply capacity of the 220kV self-healing ring network obtained are low

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