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Active compensation method for power grid grounding capacitance current

A technology of ground capacitance current and compensation method, which is applied in the field of electric power, can solve the problems of slow and fast compensation of turn-adjusting tracking speed, failure to completely eliminate arc suppression coil, and inability to compensate high-frequency components, etc., so as to avoid zero-sequence residual current, The effect of improving equipment utilization and avoiding system overvoltage

Active Publication Date: 2015-05-20
CHINA PETROLEUM & CHEM CORP +1
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AI Technical Summary

Problems solved by technology

[0009] None of the above technologies can completely eliminate the disadvantages of the arc suppression coil: the function is single and needs to be set independently; only the power frequency symmetrical current can be compensated, and the compensation speed is slow and easy to generate resonance overvoltage
The slow tracking speed of the turn-adjusting type can not play a good role in fast compensation, and the arc cannot be self-extinguished and overvoltage problems still occur; harmonics are generated during high-short-circuit impedance adjustment, and a filter unit needs to be added
Both are prone to system resonance, and cannot compensate asymmetric power frequency components and high frequency components caused by arc nonlinearity
Therefore, this technology is only a preliminary improvement of the original arc suppression coil

Method used

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  • Active compensation method for power grid grounding capacitance current
  • Active compensation method for power grid grounding capacitance current
  • Active compensation method for power grid grounding capacitance current

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Embodiment Construction

[0024] The method will be further described below in conjunction with the accompanying drawings and the summary of the invention.

[0025] The active compensation method for the capacitive current of the power network of the present invention can be applied in the power network of the neutral point small current grounding mode of different voltage levels, and is used to compensate the capacitive current of the ungrounded phase after a single-phase grounding fault, and limit the current at the grounding point to avoid grounding arc.

[0026] Its specific implementation process is:

[0027] 1. Determining Power Electronics Circuit Structure

[0028] Since the ground-to-ground capacitance current in the small-current grounded power network needs to generate a ground-to-ground zero-sequence current, and the amplitude, phase, and frequency of the current are required to be adjustable within a certain range. In the present invention, the three-phase four-arm structure power elect...

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Abstract

The invention discloses an active compensation method for power grid grounding capacitance current. The method is realized through arranging a power electron commutation assembly and a corresponding detection and control assembly between a three-phase bus and the ground in a neutral-point small-current grounding mode power grid. When single-phase grounding fault happens to the power grid, the power electron commutation assembly compensates ungrounded phase-to-ground capacitance current to enable current through a grounding point to be close to zero, system overvoltage caused by interrupted arcs can be avoided, a neutral-point grounding transformer and an arc suppression coil are replaced, and the asymmetric power frequency component and the high-frequency component of the capacitance current can be compensated.

Description

technical field [0001] The invention belongs to the field of electric power technology, specifically relates to power system overvoltage technology and power electronic technology, and more specifically relates to an active compensation method for electric power network to ground capacitance current. Background technique [0002] The neutral point of the three-phase AC power system, that is, the electrical connection between the star-connected transformer and the neutral point of the motor and the earth, is called the grid neutral point grounding method. The neutral point grounding method involves the safety, reliability and economy of the power grid, and directly affects the selection of equipment insulation levels, overvoltage levels, relay protection methods, and communication interference. [0003] The power grid of 110kV and above generally adopts the large current grounding method, that is, the neutral point effective grounding method, so that the neutral point potenti...

Claims

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Application Information

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IPC IPC(8): H02H9/08
Inventor 时振堂秦文杰李君
Owner CHINA PETROLEUM & CHEM CORP
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