Method of quickly and accurately diagnosing fault of converter in flexible DC power transmission system

A flexible DC and power transmission system technology, applied in the direction of instruments, measuring electricity, measuring electrical variables, etc., can solve problems such as difficult to quickly clear, frequent faults, etc., achieve high reliability, improve classification accuracy, and be easy to implement.

Active Publication Date: 2016-11-09
STATE GRID FUJIAN ELECTRIC POWER CO LTD +3
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Problems solved by technology

The VSC-HVDC application of overhead lines is an objective requirement for optimal energy allocation and grid development, but extending VSC-HVDC to overhead line power transmission occasions will face the problem of frequent faults that are difficult to quickly eliminate

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  • Method of quickly and accurately diagnosing fault of converter in flexible DC power transmission system
  • Method of quickly and accurately diagnosing fault of converter in flexible DC power transmission system
  • Method of quickly and accurately diagnosing fault of converter in flexible DC power transmission system

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Embodiment Construction

[0038] The technical solution of the present invention will be specifically described below in conjunction with the accompanying drawings.

[0039] A method for quickly and accurately diagnosing a fault in a converter of a flexible direct current transmission system according to the present invention comprises the following steps,

[0040] S1: Select the DC bus voltage as the fault characteristic signal of the voltage source converter under different fault types;

[0041] S2: Simulate different faults of the voltage source converter in the flexible direct current transmission system, extract the DC bus voltage waveform under different faults as the fault characteristic signal; and use Fourier transform to transform the fault characteristic signal into the frequency domain;

[0042] S3: Use the S transform to divide the frequency of the fault characteristic signal at equal intervals to obtain the characteristic information contained in each frequency component of the fault char...

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Abstract

The invention relates to a method of quickly and accurately diagnosing the fault of a converter in a flexible DC power transmission system. Different faults of a voltage source converter in a flexible DC power transmission system are simulated, and DC bus voltage waveforms under different faults are extracted as fault feature signals. The fault feature signals are transformed to a frequency domain through Fourier transform, a fault feature matrix is constructed based on the local time-frequency analysis ability of S transform and the nonlinear system fault classification ability of a support vector machine, a classification algorithm is optimized using a genetic optimization algorithm, and thus, accurate classification of the fault types of the voltage source converter is realized. Compared with previous fault diagnosis methods, the method of the invention can save more calculation time and ensure higher fault diagnosis rate.

Description

technical field [0001] The invention belongs to the research field of high-voltage direct current transmission, and in particular relates to a method for rapidly and accurately diagnosing the fault of a converter of a flexible direct current transmission system. Background technique [0002] Compared with traditional DC transmission technology, flexible DC transmission technology (VSC-HVDC) has many advantages such as no risk of commutation failure, low harmonic content of output voltage and current, and fast decoupling control of active and reactive power. The application of overhead line VSC-HVDC is an objective requirement for optimal energy allocation and power grid development, but extending VSC-HVDC to overhead line power transmission occasions will face the problem of frequent faults that are difficult to eliminate quickly. The voltage source converter is the most important part of the flexible DC transmission system, and its failure will affect the reliability of the...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/02
CPCG01R31/50
Inventor 江伟王渝红陈金祥黄道姗朱艳胡松伶
Owner STATE GRID FUJIAN ELECTRIC POWER CO LTD
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