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Multi-terminal direct-current power transmission system locking control method and device, terminal and medium

A DC transmission system and blocking control technology, applied in emergency protection circuit devices, electrical components, power transmission AC networks, etc., can solve problems such as system and equipment safety hazards, overvoltage, etc., to solve overvoltage phenomena and improve safety Effect

Pending Publication Date: 2021-01-08
ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD +1
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  • Claims
  • Application Information

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Problems solved by technology

[0005] This application provides a multi-terminal direct current transmission system locking control method, device, terminal and medium, which are used to solve the problem of overvoltage often occurring when the existing multi-terminal direct current transmission system is out of service, and when there are many stations in operation, the system and technical issues that cause serious harm to the safety of equipment

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  • Multi-terminal direct-current power transmission system locking control method and device, terminal and medium
  • Multi-terminal direct-current power transmission system locking control method and device, terminal and medium
  • Multi-terminal direct-current power transmission system locking control method and device, terminal and medium

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Embodiment Construction

[0038] After the pole layer protection action of a certain pole of a converter station, in order to protect the equipment of the station, the pole of the station should be blocked immediately, and at the same time, the control system initiates the operation of tripping the transformer circuit breaker and pole isolation. In the two-end system, if any station fails and the protection exit pole is blocked, both stations will be blocked and the system will stop. However, in a multi-terminal system that includes a DC breaker / High Speed ​​Shunt Switch (HSS) switch, it is necessary to differentiate whether the fault can be isolated by the DC breaker / HSS switch. For faults that can be isolated, only the station needs to be shut down, and non-faulty stations can resume operation; for faults that cannot be isolated, all stations in operation need to be shut down. Therefore, according to whether the fault can be isolated, the protective blocking of the pole layer sends a signal to other ...

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Abstract

The invention discloses a multi-terminal direct-current power transmission system locking control method and device, a terminal and a medium, and aims to solve the technical problem that in the priorart, devices or equipment are damaged due to an overvoltage phenomenon caused by improper coordination of shutdown time sequences of stations when a fault-free receiving-end converter station may be locked before power reduction of a rectifier station and a shutdown locking strategy with preset time delay is added after the fault-free converter station receives all in-operation station signals inemergency shutdown. The safety of emergency shutdown of all in-operation converter stations after a fault in the multi-terminal direct-current engineering is improved.

Description

technical field [0001] The present application relates to the technical field of high-voltage power transmission, and in particular to a method, device, terminal and medium for blocking control of a multi-terminal DC power transmission system. Background technique [0002] With the progress of HVDC technology, the use of multi-terminal DC transmission systems has become more and more widespread. The current multi-terminal DC transmission system generally includes a sending-end converter station and multiple receiving-end converter stations. [0003] After the pole layer protection action of a certain pole of a converter station, in order to protect the equipment of the station, the pole of the station should be blocked immediately, and at the same time, the control system initiates the operation of tripping the DC transformer circuit breaker and pole isolation. In the two-end system, if any station fails and the protection exit pole is blocked, both stations will be blocked ...

Claims

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Application Information

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IPC IPC(8): H02H7/26H02J3/36
CPCH02H7/262H02H7/268H02J3/36Y02E60/60
Inventor 李桂源黄伟煌曹润彬郭铸聂少雄蔡东晓
Owner ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD
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