Method for designing converter transformer short-circuit impedance of extra-high voltage DC project

Abstract

The invention relates to a method for designing the converter transformer short-circuit impedance of an extra-high voltage DC project, which is characterized by comprising the steps of 1) determining system parameters and main circuit calculation parameters of the extra-high voltage DC project; 2) carrying out main circuit calculation on the extra-high voltage DC project according to the acquired system parameters and the main circuit calculation parameters of the extra-high voltage DC project and an assumed value of the converter transformer short-circuit impedance, determining boundary conditions and obtaining an initial recommended value of the converter transformer short-circuit impedance; 3) analyzing factors influencing selection of the converter transformer short-circuit impedance, and checking the initial recommended value of the converter transformer short-circuit impedance to obtain alternative sets of the converter transformer short-circuit impedance under various influencing factors; and 4) selecting an intersection of the alternative sets of the converter transformer short-circuit impedance according to the obtained alternative sets of the converter transformer short-circuit impedance under various influencing factors so as to obtain an optimized converter transformer short-circuit impedance value. The method can be widely applied to the technical field of extra-high voltage direct current transmission.

Description

technical field [0001] The invention relates to the technical field of ultra-high voltage direct current transmission, in particular to a method for designing the short-circuit impedance of a converter transformer of an ultra-high voltage direct current project. Background technique [0002] The short-circuit impedance of the converter transformer is an important input condition for determining the overall design scheme of the entire DC system. A reasonable selection of the short-circuit impedance of the converter transformer can optimize the technical parameters such as the loss, cost, and size of the converter transformer itself, and at the same time be compatible with The capacity of equipment such as converter valves is matched to meet the requirements of the DC system. According to the requirements of the DC system and the manufacturing capacity of the converter transformer, the main factors affecting the short-circuit impedance of the converter transformer are determin...

AI Technical Summary

Problems solved by technology

However, in the current research on short-circuit impedance design, there are often no quantitative indicators and iterative design methods, and the impedance of the converter transformer is determined only based on the designer's subjective feeling and transportation restrictions. The impedance selected in this way is often not the optimal impedance.

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