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Extra-high voltage multi-terminal direct current transmission system current transfer suppression method based on current-voltage deviation value

A technology for multi-terminal DC and power transmission systems, applied in the field of power transmission and distribution, which can solve problems such as current transfer suppression strategies, power transmission interruptions, and current transfer risks that have not been proposed by research.

Pending Publication Date: 2022-03-18
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

When the current transfer problem occurs during the switching of the valve group, the temporary overcurrent protection may be triggered to block the converter valve group, resulting in interruption of power transmission
There is still a risk of current transfer in the implementation of the existing valve group switching strategy, and no research has yet proposed an effective current transfer suppression strategy

Method used

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  • Extra-high voltage multi-terminal direct current transmission system current transfer suppression method based on current-voltage deviation value
  • Extra-high voltage multi-terminal direct current transmission system current transfer suppression method based on current-voltage deviation value
  • Extra-high voltage multi-terminal direct current transmission system current transfer suppression method based on current-voltage deviation value

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Embodiment Construction

[0012] In order to further illustrate the principles of the present invention, the current transfer suppression method of the invention-based current-voltage deviation amount multiport DC transmission system according to the present invention will be described in detail below with reference to the drawings. It should be emphasized that the following description is merely exemplary, not to limit the scope of the invention and its application.

[0013] figure 1 Schematic structural diagram of a high-voltage mixed trial DC transmission system. The rated DC voltage is ± 800kV, the delivery station switching station is LCC, both of which are MMC, and the system uses a true bipolar wiring mode, and each of the high-end and low-end valve group consists in series. The group is a twelve pulsating converter, and the acceptable single valve group is a half complete mixing MMC.

[0014] figure 2 Control block diagram of the MMC converter station. exist figure 1 LCC 1 Svertiflow station adop...

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Abstract

The invention relates to an extra-high voltage multi-terminal direct current transmission system current transfer suppression method based on a current-voltage deviation value. The method has the advantages that the direct current at the receiving end is used as the closed-loop control quantity, the direct current is considered to be directly used as the feedback quantity of the closed-loop control of the direct-current voltage reference value, and the voltage reference value in the switching process of the valve group is dynamically adjusted according to the actual current. The method directly acts on the voltage reference value, the problem of overcurrent possibly existing in the current transfer process of the converter station is simply and effectively solved, and the method has good engineering application prospects. The method provided by the invention has relatively strong reference significance for current transfer suppression of the converter station of the extra-high-voltage multi-terminal hybrid direct-current power transmission system.

Description

Technical field [0001] The present invention belongs to the field of transmission and distribution technology, and more particularly to a current-transition suppression method based on a high voltage multi-end DC transmission system based on a current-voltage deviation amount. Background technique [0002] The high-pressure mixing multi-end DC transmission system has advantages in long distance, high-capacity transmission, combining the advantages of traditional DC and flexible DC, compared to traditional DC, and can supply power to weak receiving ends. Realize the power delivery of the sea wind farm, compared to flexible DC, and reduces power loss and reduces the cost of converter and cable investment, and has a good development prospect. [0003] The high-voltage mixing multi-end DC voltage is high, and the exchangers cost is expensive. Once the exchange station is overflow, the consequences are serious. Other Station Current Part Transfer to a class of overcurrent phenomena ca...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/36H02J3/38H02H9/02H02H7/26H02H7/22
CPCH02J3/36H02J3/38H02H9/02H02H7/268H02H7/22Y02E10/76Y02E60/60
Inventor 潘恒毅许建中贾秀芳
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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