Optical current transformer error compensation method based on DE-SVM

Abstract

The invention provides an optical current transformer error compensation method based on DE-SVM. The optical current transformer error compensation method comprises the following steps of: injecting ameasured current into an optical current transformer and a traditional current transformer at the same time; constructing an input-output training sample; optimizing parameters of an SVM (Support Vector Machine) by utilizing a DE (Differential Evolutionary Algorithm); combining the input-output training sample with the optimized parameters of the support vector machine SVM to obtain a DE-SVM error compensation model; carrying out l-layer wavelet decomposition on the output current of the optical current transformer to obtain wavelet decomposition signals; extracting an alpha-layer high-frequency coefficient of the wavelet decomposition signals, and drawing a wavelet waveform; and inputting the current in a transient state period in the wavelet waveform into the DE-SVM error compensation model to obtain a compensated output current. The optical current transformer error compensation method overcomes the defect that an existing complex mathematical model or algorithm is prone to fall into local optimum, does not need to transform the equipment, and is low in cost.

Description

technical field [0001] The present invention relates to the technical field of optical current transformer error compensation, and more specifically, relates to a DE-SVM-based optical current transformer error compensation method. Background technique [0002] Smart substation is an important part of smart grid, electronic transformer is the key equipment of smart substation, and all-fiber current transformer is one of the main varieties of electronic current transformer. Like the magneto-optic glass optical current transformer, the all-fiber current transformer is based on the Faraday magneto-optical effect, and has the advantages of no saturation, small size, simple insulation structure, corrosion resistance, aging resistance, and wide measurement range. It is an electronic current transformer. An important development direction of transformers. However, due to the residual linear birefringence in the optical fiber material, at the same time, various external factors such...

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Problems solved by technology

[0008] In order to overcome the shortcomings of the existing optical current transformer error compensation using complex mathematical models or algorithms that are easy to fall into local optimum, and the direct transformation of the optical current transformer body equipment has the disadvantage of high cost, the present invention proposes a DE-based -SVM's optical current transformer error compensation method avoids the high cost of falling into local optimum and transforming equipment

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