Extra-high-voltage converter transformer with filtering function

Abstract

The invention provides an extra-high-voltage converter transformer with a filtering function. A making method of the extra-high-voltage converter transformer with the filtering function comprises thefollowing steps that S1, the converter transformer of an extra-high-voltage direct-current power transmission system serves as an object, and the magnetic circuit saturation condition and the harmoniccirculation condition of the converter transformer are taken into consideration, wherein a circuit magnetic circuit analysis structure of a single iron core column is included; and S2, the magnetic circuit distribution and a circuit structure of the converter transformer are taken into consideration, and a four-winding type converter transformer electromagnetic coupling circuit and an electromagnetic coupling circuit equivalent circuit model according to an extra-high voltage direct current power transmission operation scene. The extra-high-voltage converter transformer with the filtering function is suitable for an extra-high-voltage direct-current power transmission system, and has a harmonic filtering function while having voltage matching and electrical isolation functions of a commonconverter transformer, so the grid-side harmonic and reactive burdens of an existing extra-high-voltage direct-current power transmission project converter transformer are reduced, and the reliability of the extra-high-voltage direct-current power transmission project is improved; and thus, the investment of a grid-side alternating-current filter is reduced.

Description

technical field [0001] The invention relates to the technical field of electrical engineering, in particular to an ultra-high voltage converter transformer with filtering function. Background technique [0002] As an important part of the converter station of the UHVDC transmission system, the converter transformer is one of the core equipment for AC-DC conversion. In the converter station of the UHV DC transmission project, the converter transformer is an important equipment to realize the voltage matching and electrical isolation of the AC and DC sides and limit the short-circuit current by connecting the AC system and the converter valve. During the operation of the UHV DC converter station, the converter valve generates a large number of harmonic currents and voltages during the conversion of AC and DC, and transmits them between the AC and DC sides of the converter valve. Since the converter transformer is quite different from the ordinary power transformer in terms of...

AI Technical Summary

Problems solved by technology

The windings on both sides of the converter transformer are disturbed by harmonic currents, resulting in increased noise of the converter transformer and increased reactive and active power losses. At the same time, because the converter valves often operate at relatively high power, the harmonic currents will cause the valve side of the converter transformer to Corrosive faults caused by overheating of the windings, which in turn cause system failures, reducing the service life of the converter transformer and the operational stability and reliability of the DC transmission system

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