Equivalent model test method for converter transformer

Abstract

The invention discloses an equivalent model test method for a converter transformer, which comprises the following steps: establishing a model transformer equivalent to a core structure of the converter transformer; designing an excitation curve of the model transformer according to a core excitation curve of the converter transformer; using a harmonic measurement loop of the model transformer toobtain the harmonic characteristics of the model transformer under the action of the direct current magnetic bias. The equivalent model test method for a converter transformer in the invention not only can obtain the corresponding harmonic characteristics of the large converter transformer but also has universality, and can guide the actual engineering according to conclusions obtained by a modelexperiment.

Description

technical field [0001] The invention belongs to the field of high-voltage direct current transmission, and more specifically relates to an equivalent model test method of a converter transformer. Background technique [0002] At present, my country has built 1000kV UHV AC and ±800k UHV DC transmission projects. In the UHV AC-DC hybrid grid, the UHV DC transmission system is often connected to the UHV AC transmission system directly or in a layered manner, so as to realize the asynchronous interconnection of the power grid across regions. In addition, in the case of high-power long-distance transmission between grid areas, DC transmission has the advantage of small line loss when transmitting equal-distance and equal-capacity electric energy. At the same time, the magnitude and direction of electric energy can be quickly and accurately adjusted in the DC transmission system, thus improving the power quality and system performance of the AC grid connected to it. [0003] Wit...

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Problems solved by technology

[0007] Aiming at the above defects or improvement needs of the prior art, the present invention provides an equivalent model test method for a converter transformer, the

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