A UHV Converter Transformer Structure with Filter Function

Abstract

The present invention provides a UHV converter transformer structure with filtering function. The UHV converter transformer structure with filtering function includes the following steps: S1: Taking the UHV DC transmission system converter transformer as the object, taking the converter into consideration Transformer magnetic circuit saturation and harmonic flow conditions, including the magnetic circuit analysis structure of a single core column circuit; S2: Considering the magnetic circuit distribution and circuit structure of the converter transformer, according to the UHV DC transmission operation scenario. The UHV converter transformer with filtering function provided by the present invention is suitable for UHVDC power transmission system. It not only has the function of voltage matching and electrical isolation of ordinary converter transformer, but also has the function of harmonic filtering to reduce the current It has the advantage of reducing the input of AC filters on the grid side due to the harmonic and reactive load on the grid side of the converter transformer of the UHV DC transmission project.

Description

technical field [0001] The invention relates to the technical field of electrical engineering, in particular to an ultra-high voltage converter transformer structure 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 i...

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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