Self-adaptation weighting data fusion fault distance measurement method based on multi-sensor system

Abstract

The invention discloses a self-adaptation weighting data fusion fault distance measurement method based on a multi-sensor system. The method is used for meeting requirements for accurate distance measurement when a high-voltage transmission line breaks down. According to the concept of the method, multi-sensor data resources of different time and spaces are made full use of, and observation data of multiple sensors are obtained by means of a computer according to a time sequence so as to obtain accurate and reliable distance measurement results. The method includes the steps of firstly a fault position and a fault style are initially estimated by means of a double-end synchronous fault distance measurement method according to PMU data, then the fault position and the fault style are initially estimated in a double-end non-synchronous fault distance measurement method and a single-end distance measurement method according to fault recording data, thirdly, the fault position and the fault style are initially estimated according to a traveling wave fault measurement result, fourthly, by means of existing prior knowledge, mean square errors on different faults occasions are obtained in different methods, weight coefficients of the mean square errors are obtained respectively, and ultimately, weighting fusion distance measurement is carried out through the self-adaptation weighting fusion distance measurement method.

Description

technical field [0001] The invention is an adaptive weighted data fusion fault ranging method based on a multi-sensor system, which belongs to the field of electric power system relay protection. Background technique [0002] With the increasing complexity of the power system scale, especially the operation of EHV and UHV transmission lines, the requirements for fault location are also getting higher and higher. Whether the high-voltage transmission line can be accurately positioned is one of the key measures to technically ensure the safety, stability and economic operation of the power system. Accurate fault location can reduce the workload of line patrol workers, reduce economic losses, and has huge economic and social benefits; in addition, the high-precision real-time online fault location method is very important for improving system stability and ensuring safe operation of the system. is of great significance. [0003] At present, there are many methods of distance ...

AI Technical Summary

Problems solved by technology

Although the traveling wave ranging method is not affected by the system operation mode, transition resistance, and line distributed capacitance in principle, it has high ranging accuracy, but its ranging accuracy is greatly affected by wave velocity changes and parameter frequency changes, especially in When a fault occurs when the voltage phase angle crosses zero or is close to zero, the distance measurement will fail, and there is also the problem that the reflected wave in the near area is difficult to identify

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