DC power transmission system based on modularized multi-level converter unit

A DC transmission system, modular multi-level technology, applied in the direction of DC network circuit devices, electrical components, power transmission AC network, etc., can solve the problems of poor fault tolerance of DC transmission system, and achieve large-scale transmission and control, Improvement of operation rate and robustness, effect of capacity increase

Inactive Publication Date: 2016-01-27
STATE GRID CORP OF CHINA +4
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to overcome the deficiencies of the prior art, and propose a DC power transmission system based on modular multilevel converter units, which solves the problem of poor fault tolerance of the DC power transmission system by using the cross redundancy structure of the system question

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  • DC power transmission system based on modularized multi-level converter unit
  • DC power transmission system based on modularized multi-level converter unit
  • DC power transmission system based on modularized multi-level converter unit

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Embodiment Construction

[0018] The present invention will be further described in detail below with reference to the drawings and embodiments.

[0019] A DC power transmission system based on modularized multilevel converter unit

[0020] (1) The structure of the DC transmission system based on the modular multilevel converter unit

[0021] The DC transmission system is composed of M×N MMCs and M+1 bus bars; among them, each N MMC forms a unit layer, forming a total of M unit layers; N MMCs in each unit layer are connected in parallel to a positive bus bar And a negative bus; connect M of the unit layers in sequence, that is, the positive bus connected to each MMC in each unit layer is the negative bus connected to the MMC of the previous unit layer; The positive bus connected to the MMC is provided with the positive pole of the direct current transmission system, and the negative bus connected to each MMC in the last unit layer is provided with the negative pole of the direct current transmission system. ...

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Abstract

The invention relates to a DC power transmission system based on a modularized multi-level converter unit. The system is formed by M by N MMCs and (M+1) buses, wherein every N MMCs form a unit layer, and M unit layers are formed in total. The N MMCs in each unit layer are connected in parallel between a positive bus and a negative bus. The M unit layers are connected in series successively, and each MMC in every unit layer is connected to the positive bus which is the negative bus connected with the MMCs in the previous unit layer. The intersecting redundant structure of the system solves the problem of poor fault-tolerant capability of the system.

Description

Technical field [0001] The invention relates to a DC power transmission system based on a modular multilevel converter unit, which belongs to the technical field of flexible DC power transmission and distribution. Background technique [0002] With the development of power technology, voltage source converter high voltage DC transmission based on fully controlled power electronic devices, that is, flexible DC transmission technology, can independently control active and reactive power without the risk of commutation failure. In addition, many advantages such as power supply for passive islands are widely favored and applied. Among them, the flexible DC transmission system based on the modular multilevel converter (MMC) has become the mainstay of the flexible DC transmission system due to its low switching frequency, low switching loss, no need for AC filters, and strong scalability. Mainstream trend. [0003] However, during the operation of the system, the MMC unit is prone to f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J1/00H02J3/36
CPCY02E60/60
Inventor 吴金龙江伟杨美娟张军王先为行登江
Owner STATE GRID CORP OF CHINA
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