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

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.

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...

AI Technical Summary

Problems solved by technology

Although the intelligent algorithm has certain advantages in improving fault tolerance, it has not been used in actual engineering. The main reason is (1) the algorithm is premature, which may lead to selection errors and conflict with the relay protection selectivity; (2) the algorithm needs Pre-learning, once the working conditions are complex, it may fail to converge due to insufficient information, and ultimately cannot determine the location of the faulty component

For the power information with a lot of data, there are few methods in the existing wide-area backup protection technology to use data mining (abandon the shortcomings of intelligent algorithms such as neural networks) to identify faults and improve fault-tolerant performance

Images