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Fault component identification method suitable for fault self-clearing type DC power distribution network

A technology of DC distribution network and identification method, applied in the electrical field, can solve problems such as extra loss, increased construction cost, electrical noise, etc., and achieve the effect of reducing investment, reducing construction investment, and strong resistance to transition resistance

Active Publication Date: 2021-09-07
TIANJIN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

These sensors will cause some electrical noise and additional losses, and will also significantly increase the construction cost

Method used

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  • Fault component identification method suitable for fault self-clearing type DC power distribution network
  • Fault component identification method suitable for fault self-clearing type DC power distribution network
  • Fault component identification method suitable for fault self-clearing type DC power distribution network

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Embodiment Construction

[0081] The present invention will be described in further detail below through specific examples. The following examples are only descriptive, not restrictive, and cannot limit the protection scope of the present invention.

[0082] A fault component identification method suitable for fault self-clearing DC distribution network, characterized in that: the steps of the identification method are:

[0083] Step A: Analyze the fault characteristics of each bus in the case of bipolar faults at different fault locations in the fault self-clearing DC distribution network:

[0084] (1) When an internal fault occurs in the line:

[0085] by figure 1 The analysis is based on the four-terminal DC power distribution system model shown above. Each line in the power distribution system is connected to two busbars. It is said that this line is associated with the two connected busbars.

[0086] If a bipolar fault occurs on the line Line1 between converters M1 and M2, that is, the fault poi...

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Abstract

The invention relates to a fault component identification method suitable for a fault self-clearing type DC power distribution network, and provides the fault component identification method for a DC power distribution mode in which a fault self-clearing converter is combined with a rapid isolation switch, and the method comprises the steps that a bus virtual voltage characteristic quantity is constructed according to the fault characteristics of each bus at different fault positions to identify the fault line; according to the switching process of a part of submodules of a hybrid converter, an auxiliary identification criterion is constructed based on the capacitance charge transfer amount, the fault bus is identified. Accurate identification of fault elements and accurate distance measurement of faults can be achieved, the method has high transition resistor resistance, and the investment of line sensors is reduced.

Description

technical field [0001] The invention belongs to the field of electrical technology, relates to an electric power system and its automatic relay protection, in particular to a method for identifying faulty components suitable for a fault self-clearing DC distribution network. Background technique [0002] The DC distribution network generally adopts the voltage source converter, and its fault current rises rapidly and has no zero crossing point, which makes it very difficult to clear the fault current. Due to the limitation of cost, operating speed and reliability, DC circuit breakers have not yet reached the level of mature application. [0003] At present, the DC power distribution form of the fault self-clearing converter combined with the fast isolating switch has become one of the important research and application directions. According to the division of principles, the identification principles of fault components in DC distribution network can be divided into voltage...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/08
CPCG01R31/086G01R31/088Y04S10/52
Inventor 李博通刘涛杨昕陆王文鑫石林陈晓龙温伟杰苏江
Owner TIANJIN UNIV
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