Relay protection state evaluation method and system based on generalized evidence theory

A technology of relay protection and evidence theory, which is applied in the field of relay protection state evaluation methods and systems, and can solve the problems of increasing unknown information and inability to give identification frameworks.

Active Publication Date: 2016-11-09
WUHAN UNIV
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Problems solved by technology

However, with the development of smart grid, due to the influence of uncertain factors such as data transmission channel congestion, unknown information h

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  • Relay protection state evaluation method and system based on generalized evidence theory
  • Relay protection state evaluation method and system based on generalized evidence theory
  • Relay protection state evaluation method and system based on generalized evidence theory

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Embodiment Construction

[0077] The technical solutions of the present invention will be further specifically described below through the embodiments and in conjunction with the accompanying drawings.

[0078] An embodiment of the present invention provides a method for evaluating the state of relay protection based on generalized evidence theory, including the following steps:

[0079] Step 1. According to the state quantities for evaluating the state of relay protection: the relay protection body, secondary circuit and communication channel, and the evaluation indicators of each state quantity, the cloud model function is used instead of the fuzzy membership function to solve the evaluation indicators for the relay protection operation. status membership.

[0080] In the described step 1, the specific operation steps are as follows: establish the state evaluation index and the state interval of each evaluation index, adopt the definition of cloud model to calculate the expectation of each index, ent...

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Abstract

The invention discloses a relay protection state evaluation method and system based on a generalized evidence theory. The relay protection state evaluation method based on the generalized evidence theory comprises steps of adopting a cloud model function to replace a fuzzy membership degree function to solve a membership degree of an evaluation index to a relay protection operation state according to a state quantity of an evaluation relay protection state, calculating a device weight based on an improved fuzzy hierarchy analytical method, calculating a device fuzziness determination result, processing to obtain initial probability distribution of the generalized evidence theory and fusing evaluation index information to obtain a state of the device. The relay protection state evaluation method and system adopt a confidence coefficient to distribute importance degrees between indexes and reduce fusion conflicts among data; compared with a traditional evidence theory, the data fusion speed of the generalized theory is fast; and the relay protection state evaluation method and system of the invention provide a novel practical technology scheme for relay protection state evaluation under a big data background.

Description

technical field [0001] The present invention relates to relay protection status evaluation, in particular to a relay protection status evaluation method and system utilizing generalized evidence theory. Background technique [0002] With the continuous development of the power system, the structure of the power grid is becoming more and more complex and the distribution range is wider and wider, and the workload and cost of maintenance are increasing. In addition, with the full use of microcomputer relay protection, the self-inspection level of the device has been continuously improved. If the maintenance method is mainly based on regular inspection, it will only cause over-repair, reduce the stability and reliability of equipment operation, and cause manpower. , waste of material and financial resources. Therefore, it is untimely to maintain the protection equipment by the conventional periodic inspection system. Condition maintenance must be carried out according to the a...

Claims

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Application Information

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IPC IPC(8): G06Q10/06G06Q50/06
CPCG06Q10/06393G06Q50/06
Inventor 龚庆武林燕贞刘栋乔卉
Owner WUHAN UNIV
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