Small current grounding system multicriteria fault line selection method based on radial basis function network

Abstract

The invention discloses a small current grounding system multicriteria fault line section method based on a radial basis function (RBF) network. For small current grounding system fault line section,zero sequence current signals under different fault conditions are adopted, a fundamental wave characteristic component, a fifth harmonic characteristic component, an active component and a transientstate component are extracted, the components are input into an RBF neural network, and structure parameters of the RBF network are trained by utilizing a differential evolution (DE) algorithm, thus optimal parameters of the RBF neural network are obtained. Test results show that the RBF network trained by virtue of the DE algorithm is high in convergence rate and small in output error, and a built line selection model has high accuracy and is not influenced by various fault conditions.

Description

technical field [0001] The invention belongs to the field of electric power system relay protection, in particular to a multi-criteria fault line selection method for a small current grounding system based on a radial basis network. Background technique [0002] The 10-66kV power supply system widely adopts the low-current grounding method, and 70% of the faults are single-phase grounding, especially in the southern power supply system where there are many thunderstorms and wet weather, the probability is higher. At present, substations with a low level of automation still use the method of manually pulling lines to search for faulty lines. Therefore, automatic and rapid location of faulty lines is particularly important for improving power supply reliability. [0003] The automatic line selection of the small current grounding system mainly includes the steady-state method and the transient method. The steady-state method includes the harmonic component method, the zero-seq...

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Problems solved by technology

[0004] Aiming at the deficiencies in the above prior art, the present invention proposes a multi-criteria fault line selection method for small current grounding systems based on radial basis network, in order to solve the existing anticipation of automatic line selection for small current grounding systems through RBF in the prior art Technical problems such as low output accuracy

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