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Hierarchical sectional capacity balance control method based on switching number

A capacitor 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 lack of capacitance and voltage balance control, so as to ensure voltage balance, improve system reliability and The effect of processing speed and ensuring flexibility

Active Publication Date: 2014-03-19
GLOBAL ENERGY INTERCONNECTION RES INST CO LTD +2
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The capacitor voltage balance algorithm of converter sub-modules based on MMC (Module Multilevel Convertor) method is the core algorithm to realize the stable operation of converter valve voltage; but in the field of large-capacity, high-voltage MMC flexible DC transmission, with the increase of , the capacitor voltage balance control becomes more and more complex
In the current domestic and foreign public information, there is very little information about the information description of the capacitor voltage control strategy algorithm, especially the large-capacity, high-voltage MMC converter sub-module capacitor voltage based on the sub-module switching number as the distribution object. There is a lack of data and patents on balance control algorithms

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  • Hierarchical sectional capacity balance control method based on switching number
  • Hierarchical sectional capacity balance control method based on switching number

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Embodiment Construction

[0029] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0030] In a modular multilevel converter (Module Multilevel Convertor, MMC converter for short), especially a large-capacity converter, the number of sub-modules is huge. During the control process, it is necessary to ensure that the sub-modules in each bridge arm The voltage is kept in a relatively balanced range, and there are many factors that need to be considered when it comes to the balance of the capacitor voltage of the sub-modules in the bridge arm. For a large-capacity MMC converter with a large number of modules, the more the number of levels, the shorter the real-time control period, and the more difficult it is to realize the capacitor voltage balance control; at the same time, due to the limited number of valve-base controller interfaces, it is necessary to The device adopts hierarchical and segmented processing to realize individual control of ...

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Abstract

The invention provides a hierarchical sectional capacity balance control method based on switching number. The switching number of sub-modules is used as allocating objects so that flexibility of strategy operation is ensured, enormous information processing is enabled to be completed very simply, conveniently and fast, and reliability and processing speed of a system are improved. Different sub-modules are confirmed according to judgment data such as voltage feedback and current directions of all subsections so that on the premise of enabling the system to operate normally, sub-module capacitor voltage balance is realized, and stable and reliable operation of the whole bridge arm sub-module in a converter and synergy coordination of the whole bridge arm sub-module with a converter protection system are ensured.

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 switching numbers. Background technique [0002] Different from traditional high-voltage direct current transmission technology, flexible direct current transmission converters have gradually become the future development trend in the field of direct current transmission due to their advantages such as flexible control, easy reversal of power flow control, convenient realization of reactive power support and frequency control, and realization of black start. ; Among them, the flexible DC transmission project based on the modular multilevel converter topology has been developed rapidly. The capacitor voltage balance algorithm of converter sub-modules based on MMC (Module Multilevel Convertor) method is the core algorithm to realize the stable operation of converter valve voltage; but in the fie...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H7/12
CPCH02M7/4835
Inventor 高阳姜喜瑞王韧秋杨兵建路建良谢敏华
Owner GLOBAL ENERGY INTERCONNECTION RES INST CO LTD