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Protection method, controller, converter station and mtdc system for multi-terminal direct current (mtdc) system

A multi-terminal DC and converter station technology, applied in emergency protection circuit devices, power transmission AC networks, electrical components, etc., can solve the problems of DC voltage drop, complex DC line fault detection, limited power exchange, etc.

Active Publication Date: 2018-02-06
HITACHI ENERGY SWITZERLAND AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

A major disadvantage of HVDC systems is that the power exchange between only two terminals is limited
Detection of DC line faults becomes complicated in complex meshed systems
One major problem: Even with remote faults, the DC voltage drops significantly

Method used

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  • Protection method, controller, converter station and mtdc system for multi-terminal direct current (mtdc) system
  • Protection method, controller, converter station and mtdc system for multi-terminal direct current (mtdc) system
  • Protection method, controller, converter station and mtdc system for multi-terminal direct current (mtdc) system

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Embodiment Construction

[0043] In the following, the principles and spirit of the invention will be described with reference to the illustrative embodiments. However, it should be understood that all these embodiments are given only to enable those skilled in the art to better understand and further implement the present invention, rather than to limit the scope of the present invention. For example, features illustrated or described as part of one embodiment can be used with another embodiment to yield a still further embodiment. In the interest of clarity, not all features of an actual implementation are described in this specification. It should of course be understood that in the development of any such actual embodiment, many implementation-specific decisions must be made in order to achieve the developer's specific goals, such as compliance with system and business-related constraints, and that these specific goals will vary with the implementation And change. Moreover, it will be appreciated...

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Abstract

The embodiments of the present invention provide a method for protection of a Multi-Terminal Direct Current (MTDC) system. The MTDC system includes a plurality of converter stations in series. The method comprises detecting a DC short circuit fault on a transmission line of the MTDC system; and determining an operation condition of respective converter stations associated with the DC short circuit fault.

Description

technical field [0001] Embodiments of the present invention generally relate to a multi-terminal direct current (MTDC) system, and more specifically, relate to a protection method, a controller, a converter station and a multi-terminal direct current system for the multi-terminal direct current system. Background technique [0002] Typically a high voltage direct current (HVDC) transmission system is usually designed and operated as a point-to-point system with two terminals, also called converter stations. A major disadvantage of HVDC systems is that the power exchange between only two terminals is limited. [0003] An MTDC system has more than two converter stations. The converter station has two operating modes. One is rectification mode and the other is inverter mode. In recent years, the application of MTDC transmission systems has become more attractive than before. Multi-terminal DC transmission system has economic advantages and technical feasibility. [0004] C...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/36
CPCH02J3/36H02H7/268
Inventor 杨晓波姚大伟苑春明
Owner HITACHI ENERGY SWITZERLAND AG
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