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Control method and system for realizing current unbalance of parallel four-terminal direct current transmission system

A technology of direct current transmission system and control method, which is applied in the direction of power transmission AC network and reversible conversion equipment, etc., and can solve problems such as complex control logic

Active Publication Date: 2016-08-17
STATE GRID CORP OF CHINA +4
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Problems solved by technology

[0008] The purpose of the present invention is to provide a control method for realizing the unbalanced current of the parallel four-terminal direct current transmission system, in order to solve the problem of complex control logic in the existing control scheme

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  • Control method and system for realizing current unbalance of parallel four-terminal direct current transmission system
  • Control method and system for realizing current unbalance of parallel four-terminal direct current transmission system
  • Control method and system for realizing current unbalance of parallel four-terminal direct current transmission system

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Embodiment Construction

[0031] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0032] method embodiment

[0033] figure 1 In the shown parallel four-terminal DC power transmission system, the rectification side includes two parallel-connected converters, and the inverter side also includes two parallel-connected converters. The present invention provides a parallel four-terminal DC power transmission system Control system for system current unbalance.

[0034] When the control system controls the rectification side, the control system includes two current control modules, the current control modules are software modules, and the corresponding functions are realized through a set software program. Therefore, the control system is essentially a control method for realizing the current unbalance of the parallel four-terminal direct current transmission system.

[0035] When controlling the rectifier side:

[0036] For these two current...

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Abstract

The invention relates to a control method and system for realizing current unbalance of a parallel four-terminal direct current transmission system. Converters on an inversion side are selected when controlled, one is a main converter, and the other is an auxiliary converter; for the main converter, a corresponding trigger pulse is generated according to a superposition value of a corresponding voltage error signal and an attached unbalance signal to perform trigger control on the main converter; for the auxiliary converter, a corresponding trigger pulse is generated according to a difference of a corresponding voltage error signal and the attached unbalance signal to perform trigger control on the auxiliary converter. The converters on the inversion side can be controlled effectively with the control method, unbalanced operation of the current of the parallel four-terminal direct current transmission system can be realized, free distribution of electric energy of the direct current transmission system is realized, and the electric energy transmission efficiency is guaranteed.

Description

technical field [0001] The invention relates to a control method and system for realizing current unbalance of a parallel four-terminal direct current transmission system, and belongs to the field of current control of a parallel multi-terminal direct current transmission system. Background technique [0002] Parallel multi-terminal HVDC transmission system is composed of multiple double-terminal DC systems in parallel, and has the structural characteristics of parallel multi-terminal system and conventional double-terminal system. It is mainly used in phased construction of DC transmission projects and DC ice melting. If the parallel multi-terminal DC transmission system fully draws on the design experience of the double-terminal DC control system, the "double-terminalization" of the multi-terminal DC control mode can be realized, which will greatly reduce the complexity of the control system design and have great practical application value, such as planning Qinghai-Tibet ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/36H02M7/68
CPCH02J3/36H02M7/68Y02E60/60
Inventor 李乾曹森马为民史林吴彦维王亚涛蒲莹孙世杰周晓风孙巍峰尹健宋延涛岳笑歌
Owner STATE GRID CORP OF CHINA
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