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A protection configuration method suitable for multi-terminal flexible substations

A multi-terminal flexible, protection configuration technology, applied in the direction of emergency protection circuit devices, electrical components, etc., can solve the problems that the full length of the line cannot be covered, the current transformer line cannot be protected, etc., to reduce the phenomenon of light and wind abandonment, and the protection action is fast Effective, simple protection principle

Active Publication Date: 2021-09-07
STATE GRID JIBEI ELECTRIC POWER COMPANY +2
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The DC line part of the flexible DC distribution network has hundreds of kilometers and only two AC input and output ports, while the multi-terminal flexible substation has multiple ports and the line length is only a few kilometers. These characteristics make the protection of the multi-terminal flexible substation impossible to copy Flexible DC distribution network, traveling wave protection is no longer suitable for multi-terminal interfaces
According to the characteristics of flexible substations, longitudinal differential protection can protect multi-terminal lines, but this cannot cover the entire length of the line, and cannot protect lines other than current transformers

Method used

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  • A protection configuration method suitable for multi-terminal flexible substations
  • A protection configuration method suitable for multi-terminal flexible substations
  • A protection configuration method suitable for multi-terminal flexible substations

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Embodiment Construction

[0034] The present invention will be described in further detail in conjunction with the accompanying drawings.

[0035] The present invention is applicable to multi-terminal protective flexible configuration of the substation, comprising the following:

[0036] 1, a flexible multi-terminal substation, before the protected areas, AC, DC protection zone before, DAB protected areas, the protected areas and the current after the exchange of protected areas, as follows:

[0037] like figure 1 Shown, the multiport flexible substation protection area is divided into five areas protected before the exchange, before the DC protection areas, DAB protected areas, the protected areas and the direct exchange of protected area, the protected ranges overlap each other, increasing the power system stability.

[0038] Further, the multiport flexible substation, using multiport interface mode interfaces, the system structure uses three system architecture;

[0039] The multiport interface mode, co...

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Abstract

The invention discloses a protection configuration method suitable for a multi-terminal flexible substation. The method is: divide the multi-terminal flexible substation into: the protection area before AC, the protection range is from the incoming line of the AC power source to the outgoing line of the modular multi-level converter; the protection area before the DC, the protection range is the outgoing line of the modular multi-level converter. To DAB incoming line; DAB protection area, the protection range is from DAB incoming line to DAB outgoing line; DC post protection area, the protection range is from DAB outgoing line to inverter incoming line; AC post protection area, the protection range is from inverter outgoing line to AC Load incoming line; for different protection zones, different protection strategies are adopted to protect multi-terminal flexible substations. The invention can freely access the DC power supply, reduces the occurrence of the phenomenon of abandoning light and abandoning wind when new energy sources such as wind power and photovoltaics are connected to the grid, and completely protects the multi-terminal flexible substation, and can flexibly adapt to the multi-power electronic device situation of the multi-terminal flexible substation.

Description

Technical field [0001] Technical Field The present invention relates to a power system protection, particularly suitable for multi-terminal is protected by a flexible configuration of the substation. Background technique [0002] With the rapid development of new energy technologies, large-scale photovoltaic and wind power grid operation. Multiport flexible substation compared with the original method after a new energy grid inverter can be new energy after a transformer directly into DC power, eliminating the cost of construction of the inverter station. DC-DC distribution network portion of the flexible circuit are only several hundred kilometers and two AC input and output ports, and a plurality of port multiport flexible substation, line length and only a few kilometers, these features make the flexible multi-terminal protection can not copy substation flexible DC distribution network, Traveling wave no longer applies where multiport interface. The flexible characteristics of...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H7/22H02H7/26
CPCH02H7/22H02H7/268
Inventor 梁东覃朝云宗瑾张建
Owner STATE GRID JIBEI ELECTRIC POWER COMPANY
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