Method and system for recognizing DC cable partial discharge signal pattern based on compressive sensing theory

Abstract

The invention discloses a method and a system for recognizing a DC cable partial discharge signal pattern based on a compressive sensing theory. The method comprises the steps of acquiring training sample data A=[ A1, A2, ...Ac], wherein A belongs to R<m*n>; acquiring data y to be recognized, wherein y belongs to R<m>; constructing y=Ax, and solving x which is defined in the description, wherein x belongs to R<n>; constructing a residual error ri which is defined in the description; solving argmin(ri) to acquire a value which represents the category of a DC cable partial discharge signal pattern corresponding to the vector y to be recognized. The method disclosed by the invention can be used for recognizing the DC cable partial discharge signal pattern, and the category of the pattern corresponds to the category of a DC cable insulation defect. Effective recognition for the state of different insulation defects of a high-voltage DC cable, such as a crosslinked polyethylene cable, can be realized according to the method. Correspondingly, the invention further discloses a system for recognizing the DC cable partial discharge signal pattern based on the compressive sensing theory. The method and the system disclosed by the invention effectively fill up the defect that less researched is performed on DC cable partial discharge defect recognition; data driving is realized based on compressive sensing, and waste of effective information is reduced; and solving performed according to a Homotopy method enables the calculation speed to be high and the recognition rate to be high.

Description

technical field [0001] The invention relates to a signal pattern recognition method and system, in particular to a DC cable partial discharge signal pattern recognition method and system. Background technique [0002] Compared with traditional AC transmission technology, flexible DC transmission technology has many advantages such as strong controllability, large transmission capacity, and long transmission distance. In recent years, the number of domestic and foreign DC transmission lines in operation has been increasing, and the voltage level has been continuously improved. The XLPE DC cable developed by a company in 2014 with ±525kV, a transmission distance greater than 1500km, and a transmission power greater than 2.6GW represents the current DC cable manufacturing. The highest level of technology. Although DC cable technology has developed unprecedentedly, the research on operation and maintenance and signal post-processing technology such as insulation live detection ...

AI Technical Summary

Problems solved by technology

The partial discharge detection of AC cables is generally based on the IEC 60885-3 standard, but there is no standard or technical specification for partial discharge detection of DC XLPE cables. The signal has the characteristics of uncertainty and diversity, which makes the study of partial discharge under DC more difficult than under AC

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