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A Calculation Method for Intelligent Substation Integrated Protection with Fault Tolerance

A technology of intelligent substation and calculation method, applied in the direction of emergency protection circuit devices, electrical components, etc., can solve problems such as difficult maintenance of expert system knowledge base, failure of circuit breaker, malfunction and other problems, and achieve scientific and reasonable calculation method and good fault tolerance Effectiveness and applicability

Active Publication Date: 2018-04-20
NORTHEAST DIANLI UNIVERSITY +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, for a large network, the establishment of such a rule base becomes very complex and huge, which makes it difficult to maintain the expert system knowledge base.
Moreover, due to information sharing, data loss, data error, circuit breaker failure or differential protection refusal and misoperation failure caused by transformer core saturation

Method used

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  • A Calculation Method for Intelligent Substation Integrated Protection with Fault Tolerance
  • A Calculation Method for Intelligent Substation Integrated Protection with Fault Tolerance
  • A Calculation Method for Intelligent Substation Integrated Protection with Fault Tolerance

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] In the fault tolerance-based intelligent substation integrated protection calculation method provided by Embodiment 1, when the transformer in the substation fails and the data transmission is normal, such as figure 1 shown, including the following steps:

[0040] S1: Divide areas according to different protection scopes of smart substations:

[0041] Step S1 includes different divisions of the protection scope of the smart substation, specifically including:

[0042] S11: Mainly take the busbars in the substation, transformers and all outgoing lines in the substation as the protection objects, and divide them into station-level protection areas and integration-level protection areas according to different protection scopes.

[0043] S12: The station domain layer protection area selects all outgoing lines in the substation, and the integrated layer protection area is the transformer and its side bus. Such as figure 2 As shown, according to the above steps S11 and S1...

Embodiment approach

[0044] S2: Obtain the output value of the direction information of each directional element in the area and the output value of the differential protection action information of the area by using the element current and voltage information. As a preferred implementation of this embodiment, it specifically includes:

[0045] S21: The positive and negative direction of the direction information is that the flow out of the bus is positive and the flow into the bus is negative. The positive sequence power value calculated by using current and voltage, when the positive sequence power is greater than 0, it is in the positive direction, and its output value is 1; when the positive sequence power is less than 0, it is in the negative direction, and its output value is -1.

[0046] image 3 , Figure 6 , Figure 9 It is the output value and positive sequence power value of all directional elements in each protection area when the transformer is faulty and the data transmission is c...

Embodiment 2

[0059] Embodiment 2 provides an intelligent substation integrated protection calculation method based on fault tolerance, and when a substation transformer fails and data loss occurs in the CD2 protection area IED4 during data transmission, the fault element is discriminated, such as figure 2 shown, including the following steps:

[0060] Figure 12 It is a simulation diagram of the directional output value and positive sequence power value when the transformer in the substation fails and the data loss occurs in the CD2 protection area IED4 during data transmission. When the data loss occurs in IED4, the directional output value remains unchanged and the positive sequence power value will decrease. Figure 13 It is a simulation diagram of the output value of the differential protection action of the CD2 protection area, the magnitude of the differential current, and the output value of the circuit breaker trip when the transformer in the substation fails and the data in the C...

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Abstract

The invention relates to an integrated protection calculation method of an intelligent transformer station based on a fault tolerance performance. The method is characterized in that areas are divided according to different protection ranges of the intelligent transformer station, current and voltage information of components are used to obtain the output value of direction information of each direction component in the area and the output value of differential protection motion information of a protection area, all obtained information of each area are mixed to calculate an integrated value of a fault component, the integrated value is compared with a threshold value of the fault component, and comparison results of each area are integrated, and the fault component is located according to a fault discriminating principle. It can be ensured that the fault position can be discriminated accurately when differential protection has misoperation or resists operation due to the fact that data information is lost or has errors, a circuit breaker is ineffective or a transformer generates exciting inrush current. The calculation method is scientific, reasonable, simple, reliable, highly adaptive and high in fault tolerance performance.

Description

technical field [0001] The invention relates to the technical field of relay protection, in particular to an intelligent substation integrated protection calculation method with fault-tolerant performance. Background technique [0002] With the rapid development of the economy, the scale and complexity of my country's power grid have been expanded and improved accordingly, and the operation mode has become more flexible. The requirements for relay protection of smart substations are getting higher and higher. Compared with traditional substations, smart substations have realized The information digitization of the whole station, the networking of the communication platform, and the standardization of information sharing can realize interoperability conveniently. However, the characteristics of information sharing in smart substations are prone to data loss or data errors. [0003] The existing intelligent substation integrated protection calculation method applies the idea o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H7/22
CPCH02H7/22
Inventor 金恩淑魏冀东金雨薇王润之韩慧岳颖宣晓辰王义军
Owner NORTHEAST DIANLI UNIVERSITY
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