Flexible DC power grid insulation fault detection method and computer equipment
A detection method and flexible DC technology, applied in the field of power systems, can solve problems such as low reliability of DC power grids
Active Publication Date: 2021-05-28
SHENZHEN POWER SUPPLY BUREAU
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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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[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 ba...
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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 difference between the amplitude of the DC component of the common-mode voltage at the first moment and the amplitude of the DC component of the common-mode voltage at the second moment of the bus is obtained as a voltage reference. And acquiring the difference between the magnitude of the third harmonic common-mode current vector of the power supply branch at the first moment and the magnitude of the third harmonic common-mode current vector of the power supply branch at the second moment as the first current reference quantity. It is judged whether the voltage reference quantity is greater than or equal to the overvoltage threshold. And judging whether the first current reference quantity is smaller than the overcurrent threshold, and then judging whether the ground insulation fault occurs in the power supply 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...
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IPC IPC(8): G01R31/08
CPCG01R31/086Y04S10/52
Inventor 王静赵宇明艾精文刘国伟秦文康徐习东
Owner SHENZHEN POWER SUPPLY BUREAU