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Regional protection system based on adaptive current protection associated factor and method thereof

A technology of current protection and area protection, applied in emergency protection circuit devices, electrical components, etc., can solve the problems of relying on data synchronization and low fault tolerance.

Active Publication Date: 2014-05-07
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a regional protection system and method based on adaptive current protection synergy factor, which is used to solve the problem that the existing regional backup protection function has low fault tolerance and relies on data synchronization

Method used

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  • Regional protection system based on adaptive current protection associated factor and method thereof
  • Regional protection system based on adaptive current protection associated factor and method thereof
  • Regional protection system based on adaptive current protection associated factor and method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0100] figure 1 It is the structural diagram of the regional protection system based on the adaptive current protection synergy factor. Such as figure 1 As shown, the regional protection system based on the adaptive current protection synergy factor includes a data acquisition module, a protection utility degree setting module, a protection coordination degree function generation module, a protection coordination degree expectation function generation module and a fault identification module.

[0101] The data acquisition module is respectively connected with the protection utility degree setting module and the protection coordination degree function generation module, and the protection utility degree setting module is respectively connected with the data acquisition module, the protection coordination degree function generation module and the protection coordination degree expectation function generation module, and the protection coordination degree function The generation...

Embodiment 2

[0160] The neutral point ungrounded system of a Tianjin 10.5KV distribution network is used for simulation verification. The grid system diagram is as follows Figure 9 shown. The composition mode of the regional backup protection system adopts the regional centralized type (with master type). Line L in this system 1 , L 2 , L 5 The type of line is overhead line, line L 3 , L 4 , L 6 for cable lines. A distributed power supply (DG) is connected to the busbar c, its rated power is 10MVA, and a current-type PQ control method is adopted. Due to the access of the distributed power supply, the double-ended power supply line L 1 , L 2 Both ends of the line are equipped with staged adaptive current protection. Line L 3 , L 4 , L 5 , L 6 Configure stage-based adaptive current protection only on the power supply side.

[0161] 1. Data acquisition module.

[0162] on line L 3 After a two-phase metallic short-circuit fault occurs in the middle section, the data acquisit...

Embodiment 3

[0174] Use the electromagnetic transient simulation software PSCAD / EMTDC to build the distribution network power system model of IEEE33 nodes for simulation verification. The system is a single power radiation system, and each branch is equipped with a circuit breaker at the head end. The circuit breaker number is the line number. . The system diagram and its component numbers are as follows: Figure 14 shown. The regional backup protection is regional centralized, and the No. 33 substation of the substation is set as the regional master station, which is responsible for receiving the data uploaded by each regional sub-station and making comprehensive decisions.

[0175] 1. Data acquisition module.

[0176] on line L 10 After a three-phase metallic ground fault occurs at the end, the data acquisition module receives the setting values ​​and action values ​​of each adaptive current protection such as Figure 15 shown.

[0177] 2. Protection utility degree setting module. ...

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Abstract

The invention discloses a regional protection system based on an adaptive current protection associated factor and a method thereof, belonging to the technical field of fault diagnosis of power systems. The regional protection system comprises a data acquisition module, a protection effectiveness setting module, a protection effectiveness function generating module, a protection cooperative degree desired function generating module and a fault recognition module. The method comprises the following steps: acquiring the set value and protection action practical state of respective adaptive current protection in a protection region; computing the effectiveness of respective adaptive current protection; computing the protection cooperative degree function value of each line; computing the protection cooperative degree desired function value of each line; computing the adaptive current protection associated factor of each line; identifying a faulty line according to the adaptive current protection associated factor of each line. The regional protection system is adaptive to the change of a power grid running way, the formation of a current protection criterion and the acquisition of a protection action value independent of the synchronism of a communication system, and faults can be adjusted accurately.

Description

technical field [0001] The invention belongs to the technical field of power system fault identification, and in particular relates to an area protection system based on an adaptive current protection coordination factor and a method thereof. Background technique [0002] Traditional relay protection usually brings the fixed value of offline setting into the protection criterion for judgment. In the power grid with complex structure and variable operation mode, traditional relay protection has been difficult to meet the requirements of system security and stability. In recent years, the maturation of adaptive relay protection research and the continuous deepening of regional communication technology research have provided an opportunity for the construction of a regional backup protection system that can adapt to changes in the system's operating mode. [0003] At present, the research on improving and improving the performance of relay protection based on regional informati...

Claims

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Application Information

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IPC IPC(8): H02H7/26
Inventor 马静郭雅蓉丁秀香黄天意王增平
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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