Method for detecting fault of power transmission line based on random matrix

Abstract

The invention discloses a method for detecting a fault of a power transmission line based on a random matrix, and the method comprises the steps: respectively obtaining three-phase currents of n sample values at two ends of the line, calculating and obtaining a sequences of positive sequence current fault components, negative sequence components and zero sequence components; respectively performing copying and translation processing of each sequence, and carrying out the expansion to form a matrix of each sequence, and then performing the superimposition of a noise matrix to form an original random matrix of each sequence; employing the random matrix theory for transforming the original random matrixes into a standard matrix product; calculating a complex eigenvalue of the standard matrixproduct, calculating and obtaining the average spectral radius of the current component sequence of the line according to the eigenvalue; constructing two criteria for fault detection of the power transmission line, determining a threshold value, and determining that the line whose average spectral radius is less than the threshold value as a faulty line. The method can accurately detect the faulty line, is not affected by the position of the fault point, the fault type, a system operation mode, power flow shift and the system oscillation, can identify a high-resistance ground fault, and has better resistance to abnormal data.

Description

technical field [0001] The invention belongs to the technical field of electric power system relay protection, and in particular relates to a transmission line fault detection method based on a random matrix. Background technique [0002] The power grid is the lifeblood of the national economy. Under such a large-scale power network, how to accurately and quickly identify and remove faulty components is a prerequisite for ensuring the safe and stable operation of the entire power system. Most of the existing fault detection methods are calculated in the fundamental wave phasor system, but the accuracy of the Fourier filter algorithm is easily affected by the attenuation of the DC component during faults, and when several bad data appear continuously, the interpolation method will also fail. Bad values ​​cannot be corrected based on adjacent data, which may cause misjudgment of fault detection. [0003] In the prior art, there is a station domain protection algorithm that is...

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Problems solved by technology

[0004] The purpose of the present invention is to aim at the deficiencies of the prior art, to provide a transmission line fault detection method based on a random matrix, to solve the problem that most of the existing transmission line fault detection methods are calculated under the fundamental wave phasor system, and its algorithm accuracy Susceptibility to attenuating DC components during faults

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