Power distribution network fault positioning method, terminal equipment and storage medium

Abstract

The invention relates to a power distribution network fault positioning method, terminal equipment and a storage medium, and the method comprises the steps: S1, collecting fault current information of each switch in a power distribution network when a fault occurs, and converting the fault current information into an actual fault state of each switch; s2, iteratively updating the state of each feeder line section in the power distribution network through an improved quantum genetic algorithm, constructing a fitness function so as to enable the difference between the actual fault state and the expected fault state of each switch to be minimum, and extracting the state of each feeder line section when the fitness function is maximum in the iteration process; and S3, positioning the fault of the feeder line segment in the power distribution network according to the extracted state of each feeder line segment. According to the method, normal and continuous power supply to the load can still be ensured under the condition that a large number of sustainable distributed power supplies are connected into the ship power distribution network, the feeder line fault section can still be quickly positioned under the complex ship navigation environment, and the method has good fault tolerance.

Description

technical field [0001] The invention relates to the field of fault detection, in particular to a distribution network fault location method, terminal equipment and storage medium. Background technique [0002] In today's environment of energy conservation and emission reduction, with the continuous development of the modern shipbuilding industry, ship energy has gradually become sustainable, and a series of renewable new energy sources such as solar energy, wind energy, fuel cells, and biomass energy have received extensive attention. The shipping sector continues to expand the application of green energy on ships. However, because the power generation characteristics of new energy sources are unstable, intermittent, susceptible to environmental influence, and small in reserves, which have a direct impact on the transient and steady-state operation characteristics of the entire ship distribution network, currently only renewable energy can be used. Energy is used on small o...

AI Technical Summary

Problems solved by technology

However, the distribution network with distributed generation (DG) is a multi-power system. The power generation characteristics of DG power supply are unstable, intermittent, easily affected by the environment, and have small reserves. It has a direct impact on the operating characteristics of the state, and with the access of the DG power supply, the power flow will be reversed, and the voltage at each point of the switch on the feeder section will increase significantly, which will affect the diagnostic accuracy of the positioning system.

like figure 1 As shown, if the feeder section L3 fails: when the DG power supply is not connected to the power grid, the FTU (distribution switch monitoring terminal) equipment at the switches S1, S2, and S3 detects a fault current, and the switch S4 has no current flow; when When the DG power supply is connected to the power grid, the DG power supply is connected to the feeder section L2 and raises the voltage there, which reduces the voltage difference between the system power supply and L2, so that the fault current at the switches S1 and S2 and the sensitivity of the FTU device are reduced, and at the same time This will also increase the fault current at the switches S3 and S4 and the sensitivity of the FTU device, thereby affecting the judgment of the cross-line current information, resulting in misjudgment by the positioning system

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