Harmonic coupling modeling method and system for AC-DC power grid

Abstract

The invention provides an AC / DC power grid harmonic coupling modeling method and system. The method comprises the following steps: acquiring historical data of an inductive geoelectric field when a geomagnetic storm occurs; constructing an alternating current power grid transformer harmonic source model, a direct current power grid converter transformer harmonic source model, a direct current power grid converter bridge harmonic source model, a direct current power grid harmonic network model and an alternating current power grid harmonic network model according to the induced earth electric field historical data during geomagnetic storm; and constructing an AC-DC power grid harmonic coupling model based on the AC power grid transformer harmonic source model, the DC power grid converter transformer harmonic source model, the DC power grid converter bridge harmonic source model, the DC power grid harmonic network model and the AC power grid harmonic network model. According to the method, the harmonic coupling model of the AC-DC power grid is constructed, so that the harmonic distribution of the AC-DC power grid under the influence of the geomagnetic induction current can be calculated and analyzed, and the capability of predicting the harmonic risk caused by the geomagnetic induction current of the power grid is improved.

Description

technical field [0001] The invention relates to the technical field of AC and DC power grids, in particular to a harmonic coupling modeling method and system for AC and DC power grids. Background technique [0002] Canada and the United States each built 400mm 2 The 735kV and 760kV voltage level power grids with four split conductors, because the unit length resistance of the 735kV and 760kV voltage level grid conductors are relatively small, the geomagnetic induced current (geomagnetic induced current, GIC) generated by the geomagnetic storm in the 735kV and 760kV power grids is relatively large, 1989 The strong geomagnetic storm on March 13, 2010 caused a major blackout in the 735kV and 760kV power grids in North America and caused a major blackout in the 735kV power grid in Quebec, Canada, and caused 60 Many transmission lines and substation transformer protection devices tripped one after another, and many plant transformers in the United States were permanently damaged...

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Problems solved by technology

[0002] Canada and the United States each built 400mm 2 The 735kV and 760kV voltage level power grids with four split conductors, because the unit length resistance of the 735kV and 760kV voltage level grid conductors are relatively small, the geomagnetic induced current (geomagnetic induced current, GIC) generated by the geomagnetic storm in the 735kV and 760kV power grids is relatively large, 1989 The strong geomagnetic storm on March 13, 2010 caused a major blackout in the 735kV and 760kV power grids in North America and caused a major blackout in the 735kV power grid in Quebec, Canada, and caused 60 Many transmission lines and substation transformer protection devices tripped one after another, and many plant transformers in the United States were permanently damaged due to excessive temperature rise caused by harmonics

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