Method for isolating faults of power distribution system with micro-grid

A power distribution system and fault isolation technology, applied in the direction of fault location, information technology support system, electrical components, etc., can solve problems such as difficult application of power distribution system protection, achieve fast communication speed, small amount of information, and easy implementation

Inactive Publication Date: 2013-11-13
孙鸣
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, it is difficult to apply this method to the protection of power distribution systems containing microgrids.

Method used

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  • Method for isolating faults of power distribution system with micro-grid
  • Method for isolating faults of power distribution system with micro-grid

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Embodiment Construction

[0024] See attached figure 1 , 2 shown. Nodes D, E, and F are located in a single power supply section, and these nodes are characterized by a difference of one between the number of incoming and outgoing lines and the number of FTUs associated with the node. If it is assumed that the short-circuit fault point is in the middle of the line L9, at this time, the FTUs that can detect the effective value of the short-circuit current in the single power supply section are No. 12, No. 13 and No. 14. According to the method of the present invention, the No. 13 FTU located at the D node and the No. 14 FTU located at the E node will respectively send the detected faults to the FTU located on the opposite side of the power inlet line of the previous node and all the FTUs located at the next node The effective value of the current, and then receive the effective value of the short-circuit current from the FTU related to its adjacent nodes. FTU No. 13 compares the effective value of th...

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Abstract

The invention relates to a method for isolating faults of a power distribution system with a micro-grid. The difference between an effective value of short-circuit current flowing through nodes at two ends of a line where a short-circuit fault point of the system is located and an effective value of short-circuit current flowing through nodes at two ends of a line free of a short-circuit fault point is utilized, FTUs (field transfer units) which are matched and mounted with a circuit breaker in the system are used for acquiring the effective value of short-circuit current flowing through each node in a short-circuit loop according to two conditions that the short-circuit fault points exist in a single power supply power section and a multiple-power supply section respectively, each FTU with a measured short-circuit current effective value acquires short-circuit current effective values, measured by other FTUs, of the node and an adjacent node with the provided method, and whether a trip instruction is sent to a corresponding circuit breaker is determined with the adoption of provided judgment logics, so that fault points can be selectively and rapidly cut off, problems about fault point positioning and isolation are effectively solved, the amount of information is small, the communication speed is high, and the implementation is easy.

Description

technical field [0001] The invention relates to a method for quickly isolating a fault point when a short-circuit fault occurs inside a power distribution system. Background technique [0002] With the increasing depletion of earth's fossil energy and increasingly serious environmental problems, people pay more attention to the application of clean energy and renewable energy, and distributed power generation is one of the important ways to apply clean energy and renewable energy. Existing studies have shown that the most effective way to maximize the efficiency of distributed power generation is to connect distributed power generation to the power distribution system in the form of a microgrid. However, the access of the microgrid has brought a series of new problems to the power distribution system, such as the two-way flow of the power flow, and the large difference in the magnitude of the short-circuit current between the grid-connected operation and the independent oper...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H7/26G01R31/08
CPCY04S10/522Y04S10/52
Inventor 孙鸣
Owner 孙鸣
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