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A three-terminal hybrid DC valve group failure exit method when inter-station communication failure

A communication fault, hybrid DC technology, applied in power transmission AC network, electrical components, emergency protection circuit devices, etc., can solve the problems of sudden change of DC current, loss of stability of DC system, long-term oscillation, etc., to avoid runaway, avoid The effect of long-term no-load operation

Active Publication Date: 2021-02-26
ANNING BUREAU OF ULTRA HIGH VOLTAGE TRANSMISSION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For the fault of the valve group of the VSC station, the fault characteristics of the DC system are different, and abnormal phenomena such as sudden changes in DC voltage and DC current and long-term oscillations are prone to occur, and even cause the entire DC system to lose stability.

Method used

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  • A three-terminal hybrid DC valve group failure exit method when inter-station communication failure
  • A three-terminal hybrid DC valve group failure exit method when inter-station communication failure
  • A three-terminal hybrid DC valve group failure exit method when inter-station communication failure

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Embodiment

[0054] This embodiment provides a method for exiting a three-terminal hybrid DC valve group failure when inter-station communication fails. The three-terminal hybrid DC power transmission system includes one LCC sending end station 1 and two VSC receiving end stations 2 . The schematic diagram of the structure of the three-terminal hybrid direct current transmission system is as follows: figure 1 shown. The LCC sending end station 1 is a rectification station, and the VSC receiving end station 2 is an inverter station. LCC sending end station 1 adopts LCC type converter valve group 11, and its topological structure is as follows Figure 2-Figure 4 shown. Both VSC receiving end stations 2 use MMC converter valve group 22; MMC converter valve group 22 is composed of Half Bridge Sub Modular (HBSM for short) and Full Bridge Sub Modular (FBSM for short ) are mixed, and the proportion of full-bridge sub-modules and half-bridge sub-modules is generally not less than 50%. Its topo...

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Abstract

The present invention relates to the field of UHV multi-terminal hybrid direct current transmission fault handling, in particular, to a fault exit method for a three-terminal hybrid direct current valve group when inter-station communication fails. After a valve group of the LCC station on the rectification side fails, it should be ensured that the constant power VSC station on the inverter side is out of service first, and the constant DC voltage VSC station on the inverter side is out of service last, so as to ensure that when each station exits, the DC The voltage can be kept stable, avoiding the oscillation of the DC system and the loss of stability of the DC system. In the case of communication failure between three terminal stations, when the valve group fails to exit, the corresponding station adopts the method of extreme outage, which can effectively prevent the non-faulty valve group from being activated again due to overvoltage after the faulty valve group is blocked. If the valve group of the LCC station is faulty, after the rectifier side is out of operation, the low-current blocking method can ensure that the constant DC power VSC station on the inverter side and the constant DC voltage VSC station on the inverter side are blocked successively, effectively preventing the VSC station from being out of control.

Description

technical field [0001] The present invention relates to the field of UHV multi-terminal hybrid direct current transmission fault handling, in particular, to a fault exit method for a three-terminal hybrid direct current valve group when inter-station communication fails. Background technique [0002] UHV three-terminal hybrid direct current transmission technology is an emerging power technology. In the world, only one UHV three-terminal hybrid direct current transmission project is under construction in China, and no UHV three-terminal hybrid direct current transmission project has yet been put into operation. [0003] In the UHV three-terminal hybrid DC power transmission project, the sending end station S1 adopts the grid-commutated converter LCC-HVDC, and the receiving end stations S2 and S3 adopt the three-phase converter based on the modular multi-level converter MMC-HVDC. A hybrid HVDC system operating in parallel. [0004] When the inter-station communication is nor...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/36H02H7/122H02H7/125
CPCH02H7/122H02H7/125H02J3/36Y02E60/60
Inventor 黄剑湘杨涛付天乙鞠翔龙磊刘航李晓霞韩建伟朱旭东李少森陈诺孙豪李浩颜波徐家将杨光刘超李德荣朱盛强丁丙侯赵潇梁钰华
Owner ANNING BUREAU OF ULTRA HIGH VOLTAGE TRANSMISSION
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