Power distribution network grounding fault active arc extinction method without power supply at converter direct current side

A technology for power supply and ground faults, which is applied in the directions of emergency protection circuit devices for limiting overcurrent/overvoltage, AC network circuits, reactive power adjustment/elimination/compensation, etc., and can solve the problem of expanding the device footprint and durability High pressure requirements, lower pressure resistance requirements, etc., to achieve the effect of solving the difficulty of source extraction, small installation area, and low pressure resistance requirements

Active Publication Date: 2021-07-16
FUZHOU UNIV
View PDF6 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In the prior art, some active arc suppression devices use a three-phase cascaded H bridge as the main circuit, which can be directly connected to the three phase lines of the distribution network. The number of components required by the device is large and the withstand voltage requirement is high; some The active arc suppression device uses a single H-bridge inverter with a step-up transformer or a single-phase cascaded H-bridge as the main circuit, and is connected to the distribution network through a grounding transformer. Although it can reduce the required components and reduce the requirements for withstand voltage, However, the additional transformer further expands the footprint of the device
Moreover, when the above-mentioned active arc suppression device is used to fully compensate the single-phase ground fault current, there is a problem that it is difficult to obtain the source of the DC side capacitance of the device.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Power distribution network grounding fault active arc extinction method without power supply at converter direct current side
  • Power distribution network grounding fault active arc extinction method without power supply at converter direct current side
  • Power distribution network grounding fault active arc extinction method without power supply at converter direct current side

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0029] In order to make the features and advantages of this patent more obvious and easy to understand, the following special examples are described in detail as follows:

[0030] An embodiment of the present invention provides an active arc suppression method for a ground fault in a distribution network without a power supply on the DC side of a converter. The topological structure of the arc suppression device in this method is that one end of the two-phase CHB bridge arm is connected to any two-phase line of the distribution network, and the other end is short-circuited as the midpoint of the bridge arm. The coil is grounded, which can fully compensate the single-phase ground fault current of the distribution network without additional DC power supply. When the arc suppression device is connected to the grid for the first time, the distribution network charges the DC side capacitor of the device through the current limiting resistor. After the natural charging is completed,...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention provides a power distribution network grounding fault active arc extinction method without a power supply at a converter direct current side. The method is characterized in that: an arc extinction device is hung between any two phase lines of a power distribution network and the ground; the arc extinguishing device which is connected to the network for the first time is pre-charged to enable its direct-current side capacitor voltage to reach a target value; and after a single-phase earth fault occurs, a current is injected into the power distribution network through the arc extinguishing device to realize full compensation of the single-phase earth fault current, and the direct current side voltage of the device is ensured to be constant in the arc extinguishing process. According to the power distribution network grounding fault active arc extinction method in the arc extinguishing process of the arc extinguishing device, grid-connected phase line selection is achieved without switching of a switch, the arc extinguishing current can be injected from any two phases of the power distribution network, single-phase earth fault current full compensation is achieved, the number of elements is effectively reduced, the requirement for the installation condition of the arc extinguishing device is lowered, and the arc extinguishing process is simplified.

Description

technical field [0001] The invention belongs to the technical field of power electronic equipment control, and in particular relates to an active arc suppression method for a grounding fault of a distribution network without a power supply at the DC side of a converter. Background technique [0002] In recent years, with the continuous expansion of the distribution network scale, the probability of single-phase ground faults has increased significantly, accounting for more than 80% of the total distribution network faults. Arcing ground faults caused by single-phase ground faults will pose a serious threat to the safe operation of the distribution network and the lives and properties of surrounding personnel. In order to solve the problem of ground fault arc suppression in distribution network, passive arc suppression technology and active arc suppression technology are widely used. Among them, active arc suppression technology is expected to gradually replace passive arc s...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Applications(China)
IPC IPC(8): H02H9/08H02J3/38H02J3/18
CPCH02H9/08H02J3/381H02J3/18H02J2203/20Y02E40/30
Inventor 郭谋发简玉婕游建章高伟洪翠
Owner FUZHOU UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products