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An active arc suppression device for distribution network

A technology for distribution network and arc suppression, which is applied to circuit devices, emergency protection circuit devices, and emergency protection circuit devices for limiting overcurrent/overvoltage, etc. It can solve the problem that the adjustment accuracy and response speed are difficult to meet the requirements of fast and reliable arc extinguishing and other problems, to achieve the effect of reliable arc extinguishing, low cost and fast response

Inactive Publication Date: 2018-09-11
CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The current distribution network fault arc suppression is generally realized by the adjustable arc suppression coil device. The device adjusts the arc suppression coil contacts to dynamically change the access capacity to perform capacitance current compensation, and it is difficult to meet the fast adjustment accuracy and response speed. Requirements for reliable arc extinguishing

Method used

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  • An active arc suppression device for distribution network
  • An active arc suppression device for distribution network
  • An active arc suppression device for distribution network

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Embodiment Construction

[0044] The software flow chart of the distribution network active arc suppression device is as follows: image 3 shown. First, continuously measure the three-phase voltage and zero-sequence voltage of the distribution network. When the zero-sequence voltage is greater than 15% of the phase voltage, it is judged that a ground fault has occurred. After comparing the three-phase voltages, it is judged that the phase with the lowest voltage is the fault phase, and the fault phase voltage is measured; The active arc suppression device injects current I into the neutral point of the distribution network i1 , measure the magnitude and phase of the neutral point voltage, and inject current I into the neutral point of the distribution network after a delay of 1s i2 , measure the neutral point voltage again, and obtain the optimal reference current through the relationship (3); the difference between the reference current and the adopted current is obtained by the proportional resonant...

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Abstract

The present invention discloses a power distribution network active arc extinction device and a current control method thereof. The device is configured to inject power current into the neutral point of a power distribution network to reach the purpose of earth fault arc extinguishing. The amplitude and the phase of the injection current may be obtained through the injection of special current into the neutral point twice and through combination of corresponding calculation methods. An injection current controller is formed by a proportion resonance controller, modulation signals are obtained by using injection current deviation signals through the proportion resonance controller, an inverter switch tube is driven after the modulation signals are subjected to triangle carrier modulation to generate inversion current, and the inversion current is outputted to the neutral point of the power distribution network after passing through a filtering circuit. The power distribution network active arc extinction device is fast in response speed, high in sensitivity and low in cost, and is able to realize rapid and reliable arc extinguishing of instant earth faults.

Description

technical field [0001] The invention belongs to the technical field of electric power system relay protection, and in particular relates to an active arc suppression device for a distribution network. Background technique [0002] The power system is a nonlinear, large-scale and complex system. The distribution network is deep into the user terminals, and the operating environment is changeable. Random faults are prone to occur, and about 70% of the faults are instantaneous ground faults. Since the distribution network has capacitance and leakage resistance to the ground, the ground fault current is capacitive current and resistive leakage current. In order to limit the ground fault current, my country's distribution network generally adopts neutral point non-grounded operation modes such as neutral point grounding, arc suppressing coil grounding, and resistance grounding. With the development of urban and rural power grids, the capacitive current increases, and the arc sup...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H9/08
CPCH02H9/08
Inventor 王文蔡演存曾祥君刘鹏周丰贺蕾思思
Owner CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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