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A Protection Scheme Containing dg for Distribution Network

A distribution network and current technology, applied in the direction of emergency protection circuit devices, electrical components, etc., can solve problems such as misoperation, refusal to operate, exit operation, etc., and achieve reliable and accurate positioning and removal, and accurate and reliable fault location.

Inactive Publication Date: 2017-02-15
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The access of DG changes the fault current distribution of the distribution network and the basic conditions of the original protection configuration of the distribution network. The original three-stage current protection may malfunction or refuse to operate
In addition, for DGs such as photovoltaic power generation systems and permanent magnet direct-drive fans, their output is greatly affected by external natural conditions such as light intensity, temperature, and wind, and DGs may also be out of operation.
Therefore, the operation mode of the distribution network containing DG becomes more complicated, which makes it difficult to set the fixed value of the traditional current protection, and it is also difficult to coordinate the coordination between protections, and it is difficult to meet the complex and changeable operation mode of the distribution network containing DG. Requirements for protection selectivity, sensitivity and quick action

Method used

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  • A Protection Scheme Containing dg for Distribution Network
  • A Protection Scheme Containing dg for Distribution Network
  • A Protection Scheme Containing dg for Distribution Network

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Embodiment Construction

[0034] The technical solution of the invention will be described in detail below in conjunction with the embodiments and with reference to the accompanying drawings.

[0035] For more generality, in such as figure 1 In the shown distribution network with DG, there is 1 DG access on feeder 1, 2 DG access on feeder 2, and no DG access on feeder 3. In addition, circuit breakers, protection 10, protection 11 and protection 12 are arranged at the end of line BC, line AF and line FG in the upstream area of ​​DG near DG, so that the fault can be cut off from both ends of the line.

[0036] 1. Fault location method based on overcurrent protection action information

[0037] In the three-stage current protection, the starting current of the current stage III, that is, the overcurrent protection, is set according to the maximum load current that may appear on the line where the protection is avoided. In the three-stage current protection, the setting value of the overcurrent protectio...

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PUM

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Abstract

The invention discloses a DG-included power distribution network protection scheme. The DG-included power distribution network protection scheme comprises the steps that (1), an information processing center is arranged in a transformer substation of a DG-included power distribution network; (2), when the DG-included power distribution network breaks down, if a certain protected over-current protection acts or some protected over-current protections act, action information is transmitted to the information processing center actively, and the information processing center preliminarily judges the fault position according to the action information of the over-current protections; (3), when a DG upstream area or a DG grid-connection point breaks down, polarity information of an offset voltage positive-sequence component at the head end protection position of a feeder line serves as the auxiliary criterion, and accurate and reliable fault positioning is achieved. The DG-included power distribution network protection scheme can rapidly, reliably and accurately position and remove faults at any position on the feeder line.

Description

[0001] Technical field [0002] The invention belongs to the field of power system distribution network protection and control, and relates to a DG-containing distribution network protection scheme. Background technique [0003] Distributed generation (distributed generation, DG) is a new type of electric energy, including photovoltaic power generation system, wind power generation system, micro gas turbine power generation system, small hydropower and so on. Distributed power generation technology has a series of advantages such as environmental protection and economy, and can well meet people's requirements for power safety, stability and economic environmental protection. It has attracted widespread attention and has been gradually promoted and developed. [0004] However, when DG is connected to the distribution network, the distribution network becomes a network with double-terminal or multi-terminal power supply. The access of DG changes the fault current distribution o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H7/28
Inventor 李永丽陈晓龙
Owner TIANJIN UNIV
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