Layering sectional type capacitive balance control method based on look-up table

Abstract

The invention provides a layering sectional type capacitive balance control method based on a look-up table method. A layering sectional type acquisition and processing structure solves the problem that ability of valve base control equipment to collect large-scale submodule information is limited. An integral voltage balance strategy of a bridge arm undertakes a balance effect in macroscopic significance. Balance control of each sectional submodule is enabled to be effective and reasonable. According to preset switching conditions, the look-up table method beforehand makes switching decision rules into list forms, and classifies all running conditions as decision output of different conditions, and task processing is enabled to be simple and rapid. Aiming at various different control targets, different pulse assignment tables can be made through special emphasis on specific gravity, and the arrangement of additional switching points is superadded, stable running of capacitor voltage of a submodule of a bridge arm is enabled to be achieved, and meanwhile switching frequency is reduced.

Description

technical field [0001] The invention belongs to the technical field of power electronics, and in particular relates to a layered and segmented capacitor balance control method based on a look-up table method. Background technique [0002] At present, various power electronic circuits based on the fully-controlled power electronic device IGBT have been increasingly used in power systems, locomotive traction, aerospace and other fields. With the development of power electronics technology, materials, and manufacturing processes, the current flow capacity of IGBT devices has become stronger and stronger, making it an important space to play in the field of DC power transmission, which directly promotes the birth and development of flexible DC power transmission technology. Different from the traditional high-voltage direct current transmission technology, the flexible direct current transmission converter replaces the thyristor series converter valve with a high-voltage convert...

AI Technical Summary

Problems solved by technology

[0004] In order to overcome the shortcomings of the above-mentioned prior art, the present invention provides a hierarchical and segmented capacitor balance control method based on the look-up table method. Due to the limitation of information collection capability, the overall voltage balance strategy of the bridge arm bears the balance effect in the macro sense, making the balance control of each sub-module more effective and reasonable

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