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Power distribution network grounding fault arc extinguishing method based on three-phase half-bridge inverter

A three-phase half-bridge and ground fault technology, which is applied to emergency protection circuit devices, electrical components, circuit devices, etc. for limiting overcurrent/overvoltage. Low frequency and other problems, to achieve the effect of large power capacity, simple control method, and low loss

Inactive Publication Date: 2020-03-13
CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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AI Technical Summary

Problems solved by technology

[0005] The existing flexible arc suppression methods mostly use a single inverter unit as a supplementary device for the arc suppression coil, which requires a step-up transformer to be connected to the distribution network through a Z-type transformer, and it has low switching frequency, high harmonic content, and low output capacity. Problems such as limited and difficult source of DC side capacitance

Method used

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  • Power distribution network grounding fault arc extinguishing method based on three-phase half-bridge inverter
  • Power distribution network grounding fault arc extinguishing method based on three-phase half-bridge inverter
  • Power distribution network grounding fault arc extinguishing method based on three-phase half-bridge inverter

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Embodiment Construction

[0026] First measure the three-phase voltage and zero-sequence voltage of the distribution network. When it is judged that a ground fault occurs, a specific current is injected into the three-phase bus of the distribution network through a three-phase half-bridge inverter, and the difference between the reference current and the sampling current of each phase The modulation signal is obtained by the proportional-integral controller, and then compared with the triangular carrier to obtain the IGBT drive pulse, which controls the on-off of the IGBT to generate an inverter current; the inverter current is filtered by the filter circuit and injected into each bus to suppress the voltage at the fault point to zero, reaching The purpose of arc suppression.

[0027] In order to verify the effectiveness of the ground fault arc suppression of the distribution network based on the three-phase half-bridge inverter described in the present invention, an arc suppression simulation model was...

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Abstract

The invention discloses a power distribution network grounding fault arc extinguishing method based on a three-phase half-bridge inverter. A three-phase half-bridge inverter is adopted to replace an arc suppression coil and is hung between each phase of bus and the ground. When a grounding fault occurs in a power grid, compensation current is calculated by utilizing measured phase voltage, specific same current is injected into a power distribution network in a split-phase mode from the three-phase half-bridge inverter, the compensation grounding fault current is zero, and the purpose of arc suppression of the grounding fault is achieved. The device is simple in structure, does not need to be connected with a boosting transformer and a grounding transformer, is quick in response and high in sensitivity, and has a good arc extinguishing effect.

Description

technical field [0001] The invention relates to the field of active arc suppression for ground faults, in particular to a ground fault arc suppression method for a distribution network based on a three-phase half-bridge inverter. Background technique [0002] With the rapid development of the distribution network and the extensive use of power cables, when a single-phase ground fault occurs in the system, the ground current is also increasing, and the arc is not easy to extinguish itself. If it cannot be effectively suppressed, it is easy to develop into a permanent single-phase fault. A ground fault may cause a system overvoltage exceeding 3 times the phase voltage, resulting in the breakdown of the weak link of the sound phase insulation, resulting in a short circuit between phases. The main factors affecting ground fault arc suppression are: ground fault current and intermittent arc overvoltage (including the initial speed of recovery voltage of the fault phase, recovery ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H9/08H02H9/04
CPCH02H9/045H02H9/08
Inventor 夏添周美娜江洪伟
Owner CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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