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Micro-grid current selective tripping protection method applicable to photovoltaic multipoint access

A multi-point access, micro-grid technology, applied in the direction of emergency protection circuit devices, electrical components, etc., to achieve good selectivity and quickness, protection of lines and busbars

Inactive Publication Date: 2015-07-29
STATE GRID CORP OF CHINA +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there is still a lack of such a current selective jump protection scheme suitable for photovoltaic multi-point access to the distribution network.

Method used

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  • Micro-grid current selective tripping protection method applicable to photovoltaic multipoint access
  • Micro-grid current selective tripping protection method applicable to photovoltaic multipoint access
  • Micro-grid current selective tripping protection method applicable to photovoltaic multipoint access

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Embodiment Construction

[0028] The microgrid current selection and protection method suitable for photovoltaic multi-point access provided by the present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0029] Such as image 3 As shown, the micro-grid current selection jump protection method suitable for photovoltaic multi-point access provided by the present invention is suitable for multi-point photovoltaic access distribution networks in open-loop operation. Before implementation, it is necessary to install A current selective trip protection device with communication capability. The specific implementation method is introduced as follows:

[0030] A short-circuit fault occurs at the power supply line A:

[0031] When the power supply direction is from m-terminal to n-terminal, if a short-circuit fault occurs on the power supply line A, the current selection jump protection device at the first switch 1 and the second switch 2 d...

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Abstract

The invention provides a micro-grid current selective tripping protection method applicable to photovoltaic multipoint access. The micro-grid current selective tripping protection method applicable to the photovoltaic multipoint access comprises the following steps of S01 stage of judging whether an onside protection device is started or not; S02 stage of judging whether an on ring main unit adjacent protection device acts or not; S03 stage of judging a protection device on an opposite side of a protection circuit acts or not; S04 stage of executing circuit fault protection; S05 stage judging whether an opposite end protection device acts or not. Compared with a traditional over-current protection and differential protection, the micro-grid current selective tripping protection method applicable to the photovoltaic multipoint access can protect circuits and buses, not need to introduce PT, has no protection dead zones, can cover the full-length of the circuit and meanwhile has good selectivity and power swing.

Description

technical field [0001] The invention belongs to the technical field of electric power system relay protection, and in particular relates to a micro-grid current selection jump protection method suitable for photovoltaic multi-point access. Background technique [0002] With the continuous progress and development of photovoltaic power generation technology, the cost of photovoltaic power generation has gradually decreased, making the development of large-scale solar energy resources possible. However, the access of a large number of photovoltaic power sources has changed the topology and power characteristics of the traditional power supply network, forming a distribution network characterized by short lines, multiple photovoltaics, and ring networks, which has brought new challenges to the protection of traditional distribution networks. challenge. [0003] The traditional power distribution network mostly operates in an open-loop operation state. The open-loop network can...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H7/26
Inventor 范须露李盛伟
Owner STATE GRID CORP OF CHINA
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