Flexible direct current transmission system overhead line submodule packet sorting modulation strategy

A power transmission system, flexible direct current technology, applied in the field of electric power, can solve problems such as reduction, and achieve the effect of reducing the amount of calculation, reducing the fluctuation of capacitor voltage and the loss of power devices

Inactive Publication Date: 2017-12-08
GLOBAL ENERGY INTERCONNECTION RES INST CO LTD +2
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  • Abstract
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  • Application Information

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Problems solved by technology

Aiming at the problems of high-voltage, large-capacity modular multilevel converter modulation and sub-module input and removal, the invention proposes a grouping sorting modulation method that reduces the calculation amount of sub-module capacitor voltage sorting

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  • Flexible direct current transmission system overhead line submodule packet sorting modulation strategy
  • Flexible direct current transmission system overhead line submodule packet sorting modulation strategy
  • Flexible direct current transmission system overhead line submodule packet sorting modulation strategy

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Embodiment Construction

[0034] The detailed content of the present invention and its specific implementation will be further described below in conjunction with the accompanying drawings.

[0035] see Figure 1 to Figure 6As shown, the flexible DC transmission system overhead line sub-module grouping sorting modulation strategy of the present invention aims to optimize the calculation amount of capacitor voltage sorting, and determines the optimal grouping number of converter bridge arm sub-modules; the grouped sub-modules are established The capacitor voltage matrix is ​​sorted vertically within the group and horizontally between groups to form a sub-module matrix in the order of the capacitor voltage of the sub-module; each control cycle, according to the current parameters of the bridge arm, increases or decreases according to the voltage of the sub-module Direction, carry out sub-module input and disconnection control. At the same time, sub-module capacitor voltage deviation control is introduce...

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Abstract

The present invention relates to a flexible direct current transmission system overhead line submodule packet sorting modulation strategy, belonging to the electric power technology field. Aiming at the high-voltage and large-capacity modularization multi-level converter modulation and submodule inputting and removing problems, a packet sorting modulation method for reducing the submodule capacitor voltage sorting operation amount is provided. An optimal capacitor voltage sorting operation amount is taken as an object, and the optimal packet quantity of a converter bridge arm submodule is determined; a submodule capacitor voltage matrix after packet is established, and the intra-group vertical sorting and inter-group transverse sorting of the submodule capacitor voltage matrix after packet are performed to form a submodule matrix taking submodule capacitor voltage as an order; and in each control period, according to bridge arm current parameters, submodule input and removing control are performed according to a direction of increasing or decreasing the submodule voltage. The submodule capacitor voltage deviation control is introduced to avoid too big capacitor voltage deviation and reduce the power device switch frequency.

Description

technical field [0001] The invention relates to the field of electric power technology, in particular to a grouping and sorting modulation strategy for overhead line sub-modules of a flexible direct current transmission system. Modulation strategy for sub-modules of modular multilevel converters suitable for flexible direct current transmission systems, which reduces the number of sub-module switches and simplifies the complexity of system operations. Background technique [0002] In 2001, the modular multilevel converter was proposed by German scholars R.Marquardt and A.Lesnicar, which promoted the development of HVDC transmission technology. So far, my country's flexible DC transmission technology has developed rapidly, and the demonstration projects that have been put into operation include: Shanghai Nanhui Demonstration Project, Nan'ao Project, Zhoushan Project and Xiamen Project. The above-mentioned projects all use DC cables for power transmission, but compared with o...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06Q10/06G06Q50/06
CPCG06Q10/0631G06Q50/06
Inventor 阳岳希杨杰许韦华涂莉江伟杜镇宇季明晶黄道姗张慧瑜杨双飞辛业春王威儒
Owner GLOBAL ENERGY INTERCONNECTION RES INST CO LTD
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