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DG (distributed generation)-containing power distribution network distributed protection and control method

A control method and distribution network technology, applied in the direction of emergency protection circuit devices, electrical components, etc., can solve problems such as the impact of quick movement

Inactive Publication Date: 2013-01-16
YANTAI POWER SUPPLY COMPANY OF STATE GRID SHANDONG ELECTRIC POWER +2
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  • Claims
  • Application Information

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Problems solved by technology

However, for long feeders with multiple switches installed, the quick action of the protection will be affected

Method used

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  • DG (distributed generation)-containing power distribution network distributed protection and control method
  • DG (distributed generation)-containing power distribution network distributed protection and control method
  • DG (distributed generation)-containing power distribution network distributed protection and control method

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specific Embodiment approach

[0050] The specific embodiment: the specific embodiment of the present invention is described in detail below in conjunction with accompanying drawing:

[0051] image 3 It is a 10kV power distribution network composed of system power supply, distributed power supply DG1 and DG2. According to the principle of network division, the network is divided into 4 areas, of which areas 2 and 4 are planned island areas; corresponding advanced feeder terminal units AFTU1~AFTU6 are configured at IB1~IB6, and IB2, IB3 and IB4 are respectively area 1 and 2. Demarcation switches for areas 2 and 3 and areas 3 and 4.

[0052] The positive direction of the specified current is from the power supply side to the load. When faults occur in different locations, the protection and control conditions are as follows.

[0053] (1) Internal fault in area 1. If a phase-to-phase or three-phase fault occurs at point F1, AFTU1~AFTU6 will detect a sudden change in current and will start. Depend on ima...

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Abstract

The invention discloses a DG (distributed generation)-containing power distribution network distributed protection and control method, and provides a protection and control technical method based on an AFTU (advanced feeder terminal unit) for the phenomenon that the high-permeability distributed power access power distribution network causes great difficulties in traditional power distribution protection and control. The method disclosed by the invention divides the DG-containing power distribution network into multiple areas capable of running as islands in advance according to the DG capacity and load. Circuit breakers and AFTUs are arranged at the feeder outlet, the DG access position and the area boundary, and the AFTUs are connected through an optical network. Each AFTU detects local electric quantity information in real time and performs information interaction with other AFTUs. The method disclosed by the invention quickly positions the fault section according to the local and neighbor electric quantity information, and realizes the fault isolation and island running. A reclosing and island network re-connection control strategy is designed by use of the related AFTU information.

Description

Technical field: [0001] The present invention relates to a distributed protection and control method for a distribution network, in particular to a distributed protection and control method for a distribution network including DG (Distributed Generation, distributed power supply with penetration rate). Background technique: [0002] The traditional power distribution network is generally radial, and a single power supply supplies one or several downstream distribution lines. The traditional distribution network protection is also designed according to a single power flow direction. In order to meet the ever-increasing load demand and effectively deal with the fossil energy crisis, it is the first priority to directly connect DG to the power distribution network on site. The access of DG can improve power quality, improve power supply reliability and reduce line loss, but it also brings a series of problems to the protection and control of distribution network. With the incr...

Claims

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Application Information

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IPC IPC(8): H02H7/28
Inventor 邹贵彬王玥婷高厚磊孙安国柳成华王邦惠鲍忠伟丛志鹏史振宇张颖牟欣玮胡婷婷
Owner YANTAI POWER SUPPLY COMPANY OF STATE GRID SHANDONG ELECTRIC POWER
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