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Double-circuit fault single-ended positioning system and positioning method based on distribution parameters

A fault single-ended, fault location technology, applied in the direction of fault location, information technology support system, etc.

Active Publication Date: 2014-07-30
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to provide a double-circuit line fault single-end positioning system and positioning method based on distribution parameters, which are used to solve the shortcomings of the existing double-circuit line fault positioning methods

Method used

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  • Double-circuit fault single-ended positioning system and positioning method based on distribution parameters
  • Double-circuit fault single-ended positioning system and positioning method based on distribution parameters
  • Double-circuit fault single-ended positioning system and positioning method based on distribution parameters

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Embodiment 1

[0217] Figure 8 Shown is a double-terminal system simulation model with a voltage level of 330kV and a length of 300km built using PSCAD software.

[0218] The phase angle difference of the equivalent power supply at both ends of the line MN is δ, and the amplitudes of the two power supplies are 1.05 and 1pu respectively. The system parameters on both sides are: Z M1 =1.0515+j43.1749Ω, Z M0 =0.6+j29.0911Ω, Z N1 =26+j44.9185ΩΩ, Z N0 =20+j37.4697Ω.

[0219] The positive (negative) sequence parameters of the single circuit line are: R 1 = 0.05468Ω / km, L 1 = 1.0264mH / km, C 1 = 0.01095 μF / km.

[0220] The zero-sequence parameters of the single-circuit line are: R 0 = 0.2931Ω / km, L 0 =3.9398mH / km, C 0 = 00.05473 μF / km.

[0221] The zero-sequence mutual impedance parameter of the double circuit line is: R m0 = 0.2385Ω / km, L m0 =2.6274mH / km, C m0 = 0.00026 μF / km.

[0222] Define the relative error of fault location:

[0223]

[0224] In the case of two-wire two-ph...

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Abstract

The invention discloses a double-circuit fault single-ended positioning system and a positioning method based on distribution parameters in the technical field of electric power system line fault positioning. The system comprises a data acquisition module, a compensation voltage solution module, a fault-position voltage solution module and a fault positioning module. The method comprises the steps of acquiring voltage phasor and current phasor at any end of a double-circuit fault line, solving a unidirectional zero sequence compensation factor function, a reverse-direction zero sequence compensation factor function and a compensation voltage function of the double-circuit fault line; solving reverse-direction sequence current at the fault position, calculating voltage phase at the fault position according to the reverse-direction sequence current at the fault position, solving a voltage amplitude value at the fault position, establishing a fault positioning function and recognizing the fault position by solving a phase mutation point of the fault positioning function. The double-circuit fault single-ended positioning system and the positioning method are suitable for various double-circuit faults, only acquire single-ended power information without information of other transformer substations, and is small in influence of the fault positions, transition resistance and other factors, high in positioning accuracy and easy to achieve.

Description

technical field [0001] The invention belongs to the technical field of power system line fault location, and in particular relates to a single-end location system and method for double-circuit line faults based on distribution parameters. Background technique [0002] The high-voltage double-circuit line erected on the same tower has a large transmission capacity and has significant economic benefits. At the same time, it can also improve the safety and stability of the power system operation, and has been widely used in recent years. However, in field operation, double circuit faults are unavoidable, and how to accurately locate the fault is of great significance to quickly isolate the fault and restore power supply in time. [0003] Currently, fault location methods for double-circuit lines are mainly divided into double-ended methods and single-ended methods. The double-ended method can be further divided into a double-ended algorithm based on simultaneous sampling or sy...

Claims

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Application Information

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IPC IPC(8): G01R31/08
CPCY04S10/52
Inventor 马静史宇欣高翔闫新王增平
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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