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Method and device for clearing DC line fault of hybrid multi-terminal DC transmission system

A technology for DC line faults and power transmission systems, applied to emergency protection circuit devices, electrical components, etc., can solve problems such as increasing line fault power loss, achieve the effects of protecting equipment safety, reducing power loss, and improving reliability

Active Publication Date: 2019-03-12
XUJI GRP +4
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide a method and device for clearing DC line faults in a hybrid multi-terminal direct current transmission system to solve the problem that directly blocking all converter stations will greatly increase the power loss when the line fails when the system restarts unsuccessfully question

Method used

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  • Method and device for clearing DC line fault of hybrid multi-terminal DC transmission system
  • Method and device for clearing DC line fault of hybrid multi-terminal DC transmission system
  • Method and device for clearing DC line fault of hybrid multi-terminal DC transmission system

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Embodiment 1

[0028] The hybrid three-terminal direct current transmission system is taken as an example below to illustrate the method for clearing DC line faults in the hybrid multi-terminal direct current transmission system of the present invention.

[0029] The topology of the hybrid three-terminal DC transmission system is as follows: figure 1 As shown, it includes the rectifier station LCC station and two inverter stations, which are MMC station 1 and MMC station 2 respectively.

[0030] LCC station, MMC station 1, and MMC station 2 are equipped with line protection systems respectively. The line protection of LCC station includes traveling wave protection, voltage mutation protection, DC line low voltage protection, and DC line differential protection; MMC type commutation with busbar Station (such as MMC station 1) line protection includes traveling wave protection, voltage mutation protection, busbar differential protection; MMC type converter station without busbar (such as MMC s...

Embodiment 2

[0039] The hybrid four-terminal direct current transmission system is taken as an example below to further illustrate the method for clearing DC line faults in the hybrid multi-terminal direct current transmission system of the present invention.

[0040] Its topology is as Figure 5 shown in figure 1 On the basis of , an inverter station MMC station 3 is added, and a DC line 3 is added accordingly.

[0041] When it is judged that the DC line 1 is faulty, the DC system first shifts the phase, clears the fault current, and restarts the DC system after the line de-ionization time. At this time, if the DC line 1 fault is cleared, the DC system establishes voltage and current, and resumes power transmission; The fault of DC line 1 still exists, and it is detected that the DC voltage cannot be established, and the fault poles of all converter stations are controlled to be blocked.

[0042] When it is judged that the DC line 2 is faulty, the DC system first shifts the phase, clear...

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Abstract

The invention relates to a method and device for clearing a DC line fault of a hybrid multi-terminal DC transmission system. For a DC system composed of a rectifier station and N-1 inverter stations (N is greater than or equal to 3), there are N-2 busbar areas on a DC line for connecting the rectifier station on the head end and the inverter station on the tail end, each busbar area is connected with an intermediate inverter station, when the DC line between two adjacent busbar areas or the DC line between the busbar area on the tail end and the inverter station on the tail end is faulty, theDC system is controlled to be restarted; and if the DC system is restarted unsuccessfully, the inverter station at the downstream of the faulty DC line is locked, and the intermediate inverter stationand the rectifier station on the head end on the upstream of the faulty DC line are restarted. By adoption of the method and device provided by the invention, the power loss during the line fault andthe disturbance to an AC system are reduced, and the fault clearing of the line fault of the hybrid multi-terminal DC transmission system is realized through a specific line fault clearing method, sothat the reliability of the hybrid multi-terminal DC transmission system is improved.

Description

technical field [0001] The invention belongs to the technical field of hybrid direct current transmission, and in particular relates to a method and device for clearing DC line faults in a hybrid multi-terminal direct current transmission system. Background technique [0002] In recent years, HVDC transmission has become an important part of the West-to-East power transmission strategy due to its advantages of large capacity and long-distance transmission. HVDC power transmission projects mostly use conventional LCC (Line Commutated Converter) converters, which have the advantages of large transmission capacity, low cost, and strong overload capacity. The problem of failure. [0003] In recent years, the DC transmission system based on Modular Multilevel Converter (MMC) technology has made rapid progress. The MMC converter has many advantages such as independent control of active and reactive power, no commutation failure, and power supply for passive island systems. The ...

Claims

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Application Information

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IPC IPC(8): H02H7/26
CPCH02H7/268
Inventor 范子强吴庆范黄金海戴国安曹森周晓风许朋见付艳吴金波李传西
Owner XUJI GRP
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