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Voltage sag source positioning method based on comprehensive criteria and neural network

A technology of voltage sag source and neural network, which is applied in the field of power system and can solve problems such as the influence of accuracy

Pending Publication Date: 2019-11-26
DEZHOU POWER SUPPLY COMPANY OF STATE GRID SHANDONG ELECTRIC POWER +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Existing voltage sag source location methods have their own scope of application and location defects, so the accuracy is affected in the actual complex power system location

Method used

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  • Voltage sag source positioning method based on comprehensive criteria and neural network
  • Voltage sag source positioning method based on comprehensive criteria and neural network
  • Voltage sag source positioning method based on comprehensive criteria and neural network

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Embodiment Construction

[0037] The preferred embodiments will be described in detail below in conjunction with the description. It should be emphasized that the following description is only exemplary and not intended to limit the scope of the invention and its application.

[0038] The present invention provides a comprehensive and efficient method for locating voltage sag sources. Fault points are respectively set in various parts of the system, and the fault types are respectively set as three-phase ground faults, two-phase ground faults, two-phase faults and single-phase ground faults. The specific implementation of this method is as follows:

[0039] 1. Extract feature quantity

[0040] Using the improved IEEE14 node model such as Figure 4 As shown, simulating the voltage sag caused by four types of faults and different grounding resistances and simulating the voltage sag caused by transformer input, a total of 80 sets of voltage sag data samples were obtained. The data samples are normalize...

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Abstract

The invention discloses a voltage sag source positioning method based on a comprehensive criterion and a neural network. The method comprises three steps of extracting comprehensive characteristic quantities including simple positioning criteria and sag characteristics, forming comprehensive criteria based on neural network training, and performing voltage sag source positioning by using the comprehensive criteria. The invention provides a comprehensive criterion based on the existing voltage sag source positioning method by using the neural network, is suitable for positioning the voltage sagsource of the power system under the big data background, and improves the positioning accuracy.

Description

technical field [0001] The invention belongs to the field of power systems, and in particular relates to a method for locating a voltage sag source. Background technique [0002] With the application of power electronic equipment and the investment of sensitive equipment in the power grid, the issue of power quality has attracted more and more attention. Voltage sag is one of the important power quality problems, and its positioning has the significance of defining the responsibilities of both parties in the accident, reducing economic losses and resolving disputes. Existing voltage sag source location methods have their own scope of application and location defects, so the accuracy is affected in the actual complex power system location. By changing the number and connection relationship of internal nodes, the neural network establishes a reasonable network structure to achieve the calculation goal. It has strong nonlinear mapping ability and can divide the feature space m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06N3/08G01R31/08
CPCG01R31/086G06N3/08
Inventor 刘朝章赵金勇武巍卢泽光张波陈钰张志强张小虎祝成张兆斌魏本成柴璐
Owner DEZHOU POWER SUPPLY COMPANY OF STATE GRID SHANDONG ELECTRIC POWER