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A method of station domain protection based on logic judgment

A technology of station domain protection and logical judgment, applied in emergency protection circuit devices, electrical components, etc., can solve the problem that protection cannot take into account selectivity, quickness and sensitivity at the same time, and cannot meet the higher requirements of complex power grid protection, etc. problems, to achieve the effect of improving backup protection performance, improving selectivity and reliability, and being easy to implement

Inactive Publication Date: 2018-11-06
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The traditional protection of substations can only obtain local single-bay or local information. This inherent deficiency has caused the protection to fail to take into account selectivity, quickness and sensitivity at the same time, and it is increasingly unable to meet the higher protection requirements of complex power grids.

Method used

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  • A method of station domain protection based on logic judgment
  • A method of station domain protection based on logic judgment
  • A method of station domain protection based on logic judgment

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] figure 1 is the structural diagram of the station domain protection system based on logical judgment provided by the present invention, such as figure 1 As shown, the station domain protection system based on logic judgment provided by the present invention includes a data read-in module, a logic judgment module and a protection action module which are connected in sequence.

[0037] The data read-in module is used to collect the logic signals of the secondary protection device of the substation, including the complex voltage blocking signal of the transformer protection device, the overcurrent protection signal, the current direction signal, the zero sequence overcurrent protection signal, the zero sequence current direction signal, and the high voltage signal. The distance protection signal, the zero-sequence current direction signal, and the zero-sequence overcurrent protection signal of the outgoing line protection device on the side, medium voltage side and low vol...

Embodiment 2

[0053] A model of a station in Liupanshui, Guizhou was built on RTDS for simulation verification. The model simulation diagram is as follows Figure 9 shown. Set up single-phase short circuit, phase-to-phase short circuit, three-phase short circuit, two-phase ground short circuit, developing fault and transfer fault on the high-voltage side busbar, the three-side transformer and the medium and low-voltage side busbar respectively to verify the station domain protection function. The verification results are shown in Table 1.

[0054] Table 1. Simulation Verification Results

[0055]

[0056]

[0057]

[0058]

[0059]

[0060]

[0061]

[0062]

[0063] The verification results show that the proposed station domain protection scheme can accurately identify various faults in the station and meet the requirements of protection rapidity, selectivity and sensitivity. Compared with the traditional protection, the action speed of the station protection is si...

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Abstract

The invention belongs to the technical field of power system relay protection, and particularly relates to a logical judgment-based substation area protection system and method. The system is characterized by comprising a data reading module, a logic judgment module and a protection action module which are sequentially connected. The method comprises the steps of collecting data; obtaining fault information through logic judgment by using a collected secondary protection device action logic signal of a substation; and sending out a tripping signal to a corresponding circuit breaker according to the fault information. According to the logical judgment-based substation area protection system and method, the backup protection performance of in-station components is effectively improved; the problems that traditional staged backup protection is difficult to match and the action delay is long are solved; and the logical judgment-based substation area protection system and method are simple, reliable and easy to implement.

Description

technical field [0001] The invention belongs to the technical field of power system relay protection, and in particular relates to a station domain protection method based on logic judgment. Background technique [0002] The traditional protection of substations can only obtain local single-bay or local information. This congenital deficiency has made the protection unable to take into account selectivity, quickness and sensitivity at the same time, and it is increasingly unable to meet the higher protection requirements of complex power grids. At the same time, with the continuous progress of computer and communication technology, it has become possible to obtain the whole station information to realize the station domain protection. The research on the station domain protection is of great significance to ensure the safe operation of the power grid. [0003] At present, there are mainly two kinds of centralized and distributed algorithms for station domain protection. A c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H7/00H02H7/04H02H7/22
CPCH02H7/00H02H7/04H02H7/22
Inventor 王增平马静王桐孙吕祎
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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