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Flexible DC power grid insulation fault detection method and computer equipment

A detection method, flexible DC technology, applied in fault location, measurement of current/voltage, fault detection by conductor type, etc., can solve problems such as low reliability of DC power grid

Active Publication Date: 2021-05-11
SHENZHEN POWER SUPPLY BUREAU
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Based on this, it is necessary to provide a flexible DC grid insulation fault detection method and computer equipment for the traditional method of disconnecting each branch one by one to find the grounding branch and the low reliability of the DC grid operation.

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  • Flexible DC power grid insulation fault detection method and computer equipment
  • Flexible DC power grid insulation fault detection method and computer equipment
  • Flexible DC power grid insulation fault detection method and computer equipment

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Embodiment Construction

[0068] In order to make the purpose, technical solution and advantages of the present application clearer, a DC power distribution system of the present application and its ground insulation fault detection method will be further described in detail through the following embodiments and with reference to the accompanying drawings. It should be understood that the specific embodiments described here are only used to explain the present application, not to limit the present application.

[0069] See figure 1 In one embodiment of the present application, a device 10 for detecting an insulation fault to ground of a flexible direct current grid is provided, and the flexible direct current grid includes a busbar and a plurality of branches electrically connected to the busbar. The detection device 10 includes a parameter detection element 100 and a relay protection element 200 .

[0070] The parameter detection element 100 is electrically connected to the positive pole of the bus bar...

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Abstract

The present application provides a method and computer equipment for detecting a ground-to-ground insulation fault of a flexible DC power grid. In the above detection method, the amplitude of the DC component of the common-mode voltage of the bus is acquired, and the amplitude of the third harmonic common-mode current vector of the power supply branch is acquired. Judging whether the magnitude of the DC component of the common-mode voltage is greater than or equal to an overvoltage threshold. When the magnitude of the DC component of the common mode voltage is greater than or equal to the overvoltage threshold, it is determined whether the magnitude of the third harmonic common mode current vector of the power supply branch is smaller than the overcurrent threshold. When the magnitude of the third harmonic common-mode current vector of the power branch is smaller than the overcurrent threshold, an insulation fault to ground occurs in the power branch. This application uses the DC voltage bias and the third harmonic common-mode current of each branch to diagnose the ground fault branch, thereby avoiding the short-term power failure of other branches caused by disconnecting each branch one by one to find the faulty branch, making the DC Network reliability is improved.

Description

technical field [0001] The present application relates to the field of power systems, in particular to a method for detecting a ground insulation fault of a flexible DC power grid and computer equipment. Background technique [0002] In the flexible DC power distribution system, if the AC side is grounded with high resistance, the DC side does not need other grounding measures. At this time, if a small ground fault occurs on the DC side, it will cause a DC voltage bias on the DC side, but the short-circuit current is small. The flexible DC power distribution system may bring huge safety hazards due to insulation damage, causing electrical safety accidents such as electric shock and fire. Therefore, insulation monitoring methods are often used to prevent them. [0003] In order to improve the reliability and accuracy of the insulation detection of the DC power distribution system, the traditional method usually uses disconnecting each branch one by one to find the grounding b...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/08G01R19/165
CPCG01R19/16547G01R31/086Y04S10/52
Inventor 赵宇明王静艾精文刘国伟秦文康徐习东
Owner SHENZHEN POWER SUPPLY BUREAU