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

A capacitance balancing and control method technology, which is applied in the direction of electrical components, emergency protection circuit devices, output power conversion devices, etc., can solve problems such as collection capacity limitations, achieve reduced switching frequency, simple and fast task processing, and effective and reasonable balance control Effect

Active Publication Date: 2013-04-10
GLOBAL ENERGY INTERCONNECTION RES INST CO LTD +2
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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 li

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

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Embodiment Construction

[0026] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0027] Such as figure 1 , the modular multilevel converter includes MMC valves, valve base control equipment and station control system, valve base control equipment includes bridge arm segmentation control unit, bridge arm aggregation unit, slow flow control unit, optical CT combination and interface unit And the valve monitoring unit, the optical CT mainly collects the bridge arm current and sends it to the current control unit for circulation suppression control; the valve monitoring unit mainly monitors the status of the valve and uploads it to the host computer for monitoring by the operator.

[0028] Provide a kind of hierarchical segmented capacitor balance control method based on table look-up method, described method comprises the following steps:

[0029] Step 1: Determine the average voltage of each segment;

[0030] Step 2: Sorting the average v...

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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...

Claims

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Application Information

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IPC IPC(8): H02H7/12
CPCH02M7/4835
Inventor 姜喜瑞高阳王韧秋杨兵建贺之渊
Owner GLOBAL ENERGY INTERCONNECTION RES INST CO LTD
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