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.
CN104269833BInactive Publication Date: 2017-02-15TIANJIN UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
TIANJIN UNIV
Publication Date
2017-02-15
Estimated Expiration
Not applicable · inactive patent

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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.
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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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