Short-circuit current sinking branch switch-in control method and device based on voltage response characteristic

A technology with short-circuit current and voltage characteristics, applied in the field of short-circuit current absorbing branch input control, can solve the problems of poor current limiting effect, affecting system safety, high false alarm rate, ensuring safe and stable operation, large short-circuit capacity, The effect of reliable disconnection and isolation of faults

Active Publication Date: 2019-07-02
CHINA ELECTRIC POWER RES INST +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

These methods may affect system security, or have low reliability, high false alarm rate, and poor current limiting effect

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  • Short-circuit current sinking branch switch-in control method and device based on voltage response characteristic
  • Short-circuit current sinking branch switch-in control method and device based on voltage response characteristic
  • Short-circuit current sinking branch switch-in control method and device based on voltage response characteristic

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Embodiment Construction

[0042] Exemplary embodiments of the present invention will now be described with reference to the drawings; however, the present invention may be embodied in many different forms and are not limited to the embodiments described herein, which are provided for the purpose of exhaustively and completely disclosing the present invention. invention and fully convey the scope of the invention to those skilled in the art. The terms used in the exemplary embodiments shown in the drawings do not limit the present invention. In the figures, the same units / elements are given the same reference numerals.

[0043] Unless otherwise specified, the terms (including scientific and technical terms) used herein have the commonly understood meanings to those skilled in the art. In addition, it can be understood that terms defined by commonly used dictionaries should be understood to have consistent meanings in the context of their related fields, and should not be understood as idealized or over...

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Abstract

The invention provides a short-circuit current sinking branch switch-in control method and device based on a voltage response characteristic. The method provided by the invention comprises steps of generating a short-circuit current sinking branch switch-in instruction when it is detected that the voltage characteristic value of a monitored AC bus is lower than a preset voltage threshold; and in response to the short-circuit current sinking branch switch-in instruction, switching the short-circuit current sinking branch into a grid. The method provided by the invention generates the short-circuit current sinking branch switch-in instruction based on the level change of the bus voltage before and after a fault, can reduce the short-circuit current level of a short-circuit point, ensures that a fault protection switch reliably disconnects and isolates the fault, thereby providing a sufficiently large short-circuit capacity for the normal operation of the grid to ensure safe and stable operation of the grid.

Description

technical field [0001] The invention belongs to the field of power system safety and stability control, and relates to a method and device for controlling input of a short-circuit current absorption branch based on voltage response characteristics. Background technique [0002] As the scale of my country's power grid continues to expand and the grid structure becomes denser, the short-circuit current level of the system also rises sharply. If the short-circuit current exceeds the interrupting capability of the protection switch, the protection switch will not be able to cut off the short-circuit current and fail to isolate the fault, which will further lead to serious accidents such as burning of lines and equipment, and destruction of system stability. Therefore, effective measures must be taken to effectively reduce the short-circuit current level. [0003] Common methods now include optimizing grid structure, pulling and stopping lines, and installing fault current limit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H3/02H02H7/26
CPCH02H3/025H02H7/262
Inventor 孙华东赵兵卜广全郭强王姗姗王铁柱王志文徐式蕴李英彪贾天下
Owner CHINA ELECTRIC POWER RES INST
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