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Power distribution network affine state estimation method

A state estimation and distribution network technology, applied in the field of distribution network, can solve problems such as fault location deviation, three-phase load imbalance, small section line faults, etc., to restore power, reduce fault intervals, and increase manpower and material resources Effect

Pending Publication Date: 2021-03-09
中达安股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, during the operation of the distribution network, there may be deviations in the location of fault points due to unbalanced three-phase loads, small line faults caused by fault points, and insufficient calculation methods in detection technology.

Method used

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  • Power distribution network affine state estimation method
  • Power distribution network affine state estimation method
  • Power distribution network affine state estimation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] A distribution network affine state estimation method, such as figure 1 shown, including:

[0046] Step S1. At the head end of the distribution network, perform fault distance acquisition operations on the fault phase and the first normal phase to obtain the first fault distance L 1 .

[0047] It should be noted that the first end of the distribution network is the end of the distribution power output, and the first fault distance L 1 is the lower bound of the first fault interval. By adopting the fault distance obtaining operation, the obtained fault distance is generally smaller than the distance from the tested end to the actual fault point.

[0048] Step S2. At the end of the distribution network, perform a fault distance acquisition operation on the fault phase and the first normal phase to obtain the second fault distance L 2 .

[0049] It should be noted that the end of the distribution network is the receiving end of the distributed power, and the second fa...

Embodiment 2

[0090] Assume that the fault point is 15km away from the head end.

[0091] Through the above fault distance obtaining operation, the first fault interval [14.990km, 15.010km] and the second fault interval [14.995km, 15.015km] are obtained. Through affine number conversion, the first affine number 15.000+0.010ε is obtained 1 and the second affine number 15.005+0.010ε 1 , where ε 1The value range of is [-1,1].

[0092] Obtain the third affine number 15.0025+0.010ε based on the first affine number and the second affine number 1 , where ε 1 The value range of is [-1,1]. Then the third fault interval [14.9925km, 15.0125km] is obtained.

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Abstract

The invention discloses a power distribution network affine state estimation method, which comprises the steps of executing a fault distance obtaining operation on a fault phase and a first normal phase at the head end of a power distribution network to obtain a first fault distance; executing a fault distance obtaining operation on the fault phase and the first normal phase at the tail end of thepower distribution network to obtain a second fault distance; obtaining a first fault interval according to the first fault distance and the second fault distance; converting the first fault intervalinto a first affine number; executing a fault distance obtaining operation on the fault phase and a second normal phase at the head end of the power distribution network to obtain a third fault distance; executing a fault distance obtaining operation on the fault phase and the second normal phase at the tail end of the power distribution network to obtain a fourth fault distance; obtaining a second fault interval according to the third fault distance and the fourth fault distance; converting the second fault interval into a second affine number; and obtaining a third affine number according to the first affine number and the second affine number, and further obtaining a third fault interval. The error of fault point positioning is reduced.

Description

technical field [0001] The invention relates to the field of distribution networks, in particular to an affine state estimation method of a distribution network. Background technique [0002] Electric energy is widely used in various fields such as power, lighting, chemistry, textiles, and communication. Today's social development is inseparable from electric energy. Distribution network refers to a type of power network that receives electric energy from the transmission network or regional power plants, and then distributes it locally through power distribution facilities or distributes it to various users step by step according to voltage. Distribution grids play a vital role in today's power systems. [0003] During the actual process of power transmission in the distribution network, failures may occur due to various reasons. Most of these distribution network faults are single-phase to ground faults. The method of accurately and effectively detecting single-phase gr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/08G01R29/18G01R29/16
CPCG01R31/086G01R31/088G01R29/16G01R29/18Y04S10/52
Inventor 罗均张委林家威
Owner 中达安股份有限公司
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