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Electric field analysis-based super high-voltage direct current transmission converter valve fault diagnosis method

An ultra-high voltage DC and fault diagnosis technology, applied in the direction of testing dielectric strength, etc., can solve the problems of wasting computer resources, difficult to converge calculation results, and incomplete analysis models, and achieve the effect of ensuring reasonable utilization.

Active Publication Date: 2014-03-12
XJ ELECTRIC
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Problems solved by technology

However, in the current research on the electric field of the converter valve, some of the analysis models established in the analysis of the electric field of the converter valve are not perfect enough to reflect the complete electric field of the converter valve; some use the original mechanical model when calculating the electric field analysis, which not only wastes computer resources, but also makes it difficult to converge the calculation results

Method used

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  • Electric field analysis-based super high-voltage direct current transmission converter valve fault diagnosis method
  • Electric field analysis-based super high-voltage direct current transmission converter valve fault diagnosis method
  • Electric field analysis-based super high-voltage direct current transmission converter valve fault diagnosis method

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Embodiment Construction

[0029] Such as Figure 6 As shown, the UHVDC converter valve fault diagnosis method based on electric field analysis includes the following steps:

[0030] A. Extract structural parameters from the preliminary designed converter valve model: including parameters such as the size, shape, and position in the valve tower of all metal parts in the converter valve; parameters such as water pipes, solid insulating media, and air gaps in the valve tower ; the material properties of all components in the converter valve, with emphasis on permittivity and conductivity in the electric field analysis.

[0031] B. Simplify and equivalently analyze the extracted valve tower structural parameters, and establish a converter valve model suitable for electric field calculation.

[0032] C. Judgment whether the established electric field calculation model is correct: analyze by comparing with the actual model to determine whether the established calculation model can correctly reflect the elec...

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Abstract

The invention relates to an electric field analysis-based super high-voltage direct current transmission converter valve fault diagnosis method, comprising the steps of extracting structural parameters according to an actual model of a converter valve; establishing an electric field computing model of the converter valve according to the extracted structural parameters; selecting the electric field type to be applied to the electric field computing model of the converter valve and setting corresponding excitation and boundary conditions; performing electric field analysis on the electric field computing model of the converter valve, judging whether an insulation fault occurs, and positioning the fault occurring position. From the property of the electric field, the electric field computing model capable of reflecting the insulation characteristics of the converter valve can be accurately established, and the reasonable use of the computer resource is ensured; the insulation features of the insulation structure can be analyzed according to the actual condition under different work conditions, the position easily subjected to local discharging is judged, and the fault occurring position is accurately positioned.

Description

technical field [0001] The invention belongs to the technical field of power electronics, and relates to a method for diagnosing a fault of a UHV direct current transmission converter valve based on electric field analysis. Background technique [0002] High Voltage DC transmission (HVDC) has the advantages of being suitable for long-distance, high-power, and cross-regional power transmission. HVDC technology has developed rapidly for more than half a century. In my country, ±800kV is defined as the voltage level of UHV DC voltage. There are more than 40 DC transmission projects planned and constructed in my country, including more than 15 Ultra High Voltage DC transmission (UHVDC) projects. [0003] As the core equipment of the UHV DC transmission system, the converter valve is the main device to realize the conversion of AC and DC power, and it is also the most expensive equipment in the UHV DC transmission system. It has high technical difficulty, high integration, high s...

Claims

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Application Information

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IPC IPC(8): G01R31/12
Inventor 姚为正张军马俊民何青连张海龙秦伟伟李旭升李生林
Owner XJ ELECTRIC
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