Method for realizing metal transverse differential protection of parallel multi-terminal direct-current power transmission system

A multi-terminal DC and power transmission system technology, applied to emergency protection circuit devices, electrical components, power transmission AC networks, etc., can solve problems such as no longer fully applicable, complex topology, etc., and achieve the effect of convenient selection

Active Publication Date: 2021-03-05
CSG EHV POWER TRANSMISSION +3
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Compared with the conventional two-terminal DC transmission system, the topology structure of the metal loop operation mode of the parallel multi-terminal DC transmission system is more complicated. The metal loop line is separated into different line segments by the converter station. Configured protection and fault clearing methods are no longer fully applicable

Method used

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  • Method for realizing metal transverse differential protection of parallel multi-terminal direct-current power transmission system
  • Method for realizing metal transverse differential protection of parallel multi-terminal direct-current power transmission system
  • Method for realizing metal transverse differential protection of parallel multi-terminal direct-current power transmission system

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Embodiment

[0070] It should be noted that the terms "first" and "second" in the description and claims of the present invention and the above drawings are used to distinguish similar objects, but not necessarily used to describe a specific sequence or sequence. It is to be understood that the data so used are interchangeable under appropriate circumstances such that the embodiments of the invention described herein can be practiced in sequences other than those illustrated or described herein. In addition, the terms "comprising" and "having" and any variations thereof in the embodiments of the present invention are intended to cover a non-exclusive inclusion, for example, a process, method, system, product or device comprising a series of steps or units is not necessarily limited to Those steps or elements are not explicitly listed, but may include other steps or elements not explicitly listed or inherent to the process, method, product or apparatus.

[0071] In the description of the pr...

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Abstract

The invention discloses a method for realizing metal transverse differential protection of a parallel multi-terminal direct-current power transmission system, and relates to the technical field of direct-current power transmission systems. A first convertor station, a second convertor station and a third convertor station are respectively provided with a metal loop longitudinal differential protection device, and the third convertor station is also provided with a metal loop fault line selection device; the third converter station also has a confluence bus area and is provided with a rapid isolation switch; and metal loop transverse differential protection devices are configured in the second converter station and the third converter station. When an inter-station communication fault occurs, the metal loop longitudinal differential protection device stops working, and the metal loop transverse differential protection device is put into work. The metal loop transverse differential device triggers a corresponding protection action according to the current of the opposite-pole direct-current line of the station and the current of the opposite-pole direct-current line of the opposite station; and the metal loop fault line selection device judges the fault type of the metal loop according to the protection action of the metal loop transverse difference device and adopts a corresponding fault clearing strategy.

Description

technical field [0001] The invention relates to the technical field of direct current transmission systems, in particular to a method for realizing metal transverse difference protection in a parallel multi-terminal direct current transmission system. Background technique [0002] Parallel multi-terminal direct current transmission system refers to a direct current transmission system with three or more converter stations. When the power is supplied from the center, it is more economical and flexible than the DC transmission system at both ends. [0003] The metal return line operation mode of the DC transmission system refers to the unipolar operation mode in which after one pole is out of operation, the other pole uses its transmission line as the current return path between the neutral points of each converter station, connecting the neutral points of each converter station. The line of points is called a metal loop. Compared with the conventional two-terminal DC transm...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H7/26H02J3/36
CPCH02H7/262H02H7/268H02J3/36Y02E60/60
Inventor 许朋见李庆江张楠蔡永梁吴庆范王亚涛张群汪秀才靳巩磊范子强王成久范雪峰周晓风李亚峰毛成搏
Owner CSG EHV POWER TRANSMISSION
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