Wide-area backup protection method based on sequence current gray correlation and multi-information fusion

A wide-area backup protection, multi-information fusion technology, applied in emergency protection circuit devices, emergency protection data processing devices, electrical components, etc., can solve the problems of premature algorithm, wrong selection, insufficient information, etc. Taking into account the effect of reliability and good fault tolerance

CN108429245BActive Publication Date: 2019-10-29SHANGHAI UNIVERSITY OF ELECTRIC POWER
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Publication Date
2019-10-29

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Abstract

The invention relates to a sequence current grey correlation and multi-information fusion-based wide-area backup protection method. The method comprises the steps that electric power system transientinformation is mined by means of the gray correlation degree, and combined with state information, multiple pieces of information is fused to conduct grid fault line determination, transient electrical quantities are combined, compared with a pure simple information fusion technology, better fault freedom is achieved, and by means of the electrical quantities, information errors or deletion causedby reasons such as transmission channel faults and sampling can be effectively overcome; a sequence current grey correlation method is introduced, protection still has good motion performance under the complex work conditions such as high resistance grounding and open-phase operation, and certain sensitivity is achieved. Accordingly, the reliability and high fault tolerance are both considered, and meanwhile data sources do not need to be put into an electric power system synchronous phasor measurement device, a person only needs to utilize an existing device of a transformer substation, andthe economical efficiency is better achieved. According to the method, the high fault freedom is achieved, and the certain adaptive capacity and the good motion performance are achieved under the complex work conditions.
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Description

technical field

[0001] The invention relates to a power management protection technology, in particular to a wide-area backup protection method based on sequence current gray correlation and multi-information fusion. Background technique

[0002] my country's power industry has deepened development, and the structure of the power system has become more complex. The traditional relay protection configuration method that uses the local information of the substation to judge the fault has limited information, and it is difficult to play the due role of protection in some special fault situations. performance. Therefore, people propose wide-area backup protection based on SCADA / WAMS measurement system data to solve the prominent problems in traditional relay protection.

[0003] Because the node information of the wide area system may have error codes and packet loss during long-distance transmission, this will cause misjudgment by the decision-making agency, which requires rese...

Examples

Embodiment Construction

[0041] A wide-area backup protection method based on sequence current gray relational analysis and multi-information fusion, comprising the following steps:

[0042] 1. The start of regional backup protection and the detection of suspected fault lines;

[0043] 2. According to the sequence current gray relational analysis principle, the fault degree of the integrated sequence current of the line is obtained;

[0044] 3. Calculate the fault degree of the line according to the information fusion of the status information detection of the protection components;

[0045] 4. Perform weighted fusion of the failure degrees of step 2 and step 3 to obtain the joint failure degree.

[0046] 1. The start-up of regional backup protection and the detection method of suspected faults are as follows:

[0047] 1) Regionalization of power grid

[0048]Because the power grid is very large and there are many nodes, it is impractical to use the whole power grid as the object of wide-area backu...