Troubleshooting method, device and flexible direct current transmission system

A fault handling method and power transmission system technology, which are applied to emergency protection circuit devices, electrical components, power transmission AC networks, etc., can solve problems such as prolonging the operation time of stable devices, multiple system shocks, and expanding the impact of faults.

Active Publication Date: 2022-04-05
TSINGHUA UNIV
View PDF0 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this restoration operation is blind. It does not judge whether the fault has disappeared before locking it. For permanent faults, it will still be restored multiple times, causing multiple impacts on the system, prolonging the operating time of the safety device, and expanding the impact of the fault.

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
  • Troubleshooting method, device and flexible direct current transmission system
  • Troubleshooting method, device and flexible direct current transmission system
  • Troubleshooting method, device and flexible direct current transmission system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] Such as figure 1 As shown, according to the embodiment of the first aspect of the present invention, a fault handling method for a flexible direct current transmission system is proposed, the method comprising:

[0046] Step 102, in response to the fault signal of the flexible direct current transmission system, block the fault processing submodule;

[0047] Step 104, obtaining the current of the transmission line;

[0048] Step 106, whether the current drops to the first current threshold, if so, go to step 108, if not, go to step 104;

[0049] Step 108, control the fault processing sub-module to switch to the non-controlled rectification operation mode after the de-ionization time has elapsed;

[0050] Step 110, determining the fault state of the flexible direct current transmission system according to the current;

[0051] Step 112, control the fault processing sub-module according to the fault state.

[0052] In this embodiment, the fault processing sub-module i...

Embodiment 2

[0057] Such as figure 2 As shown, according to an embodiment of the present invention, a fault handling method for a flexible direct current transmission system is proposed, the method comprising:

[0058] Step 202, in response to the fault signal of the flexible direct current transmission system, block the fault processing submodule;

[0059] Step 204, obtaining the current of the transmission line;

[0060] Step 206, whether the current drops to the first current threshold, if so, go to step 208, if not, go to step 204;

[0061] Step 208, control the fault handling sub-module to switch to the non-controlled rectification operation mode after the de-ionization time elapses;

[0062] Step 210, whether the current reaches the second current threshold within the first preset time period, if yes, go to step 212, if not, go to step 214;

[0063] Step 212, determining that the fault state is a permanent fault;

[0064] Step 214, whether the current reaches the third current t...

Embodiment 3

[0070] Such as image 3 As shown, according to an embodiment of the present invention, a fault handling method for a flexible direct current transmission system is proposed, the method comprising:

[0071] Step 302, blocking the fault processing submodule in response to the fault signal of the flexible direct current transmission system;

[0072] Step 304, obtaining the current of the transmission line;

[0073] Step 306, whether the current drops to the first current threshold, if so, go to step 308, if not, go to step 304;

[0074] Step 308, control the fault handling sub-module to switch to the non-controlled rectification operation mode after the de-ionization time has elapsed;

[0075]Step 310, whether the current reaches the third current threshold within the second preset time period, if yes, go to step 312, if not, go to step 314;

[0076] Step 312, determining that the fault state is a permanent fault, controlling the fault processing sub-module to exit the uncontr...

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 fault processing method, device and flexible direct current transmission system. The method includes: responding to the fault signal of the flexible direct current transmission system, blocking the fault processing sub-module; obtaining the current of the transmission line; based on the current falling to the first current threshold, controlling the fault processing sub-module to switch to uncontrolled rectification after the deionization time The operation mode; determine the fault state of the flexible direct current transmission system according to the current; control the fault processing sub-module according to the fault state. Therefore, it is possible to identify the fault state after the end of the deionization stage, unlock only after it is judged as a transient fault, and re-block the faulty pole converter after it is judged as a permanent fault, isolate the faulty line, and realize the automatic failure of the flexible DC transmission system. Adaptive recovery avoids unnecessary shocks and delays in stability control actions caused by repeated recovery operations under permanent faults, which is conducive to improving system stability and power supply reliability.

Description

technical field [0001] The present invention relates to the technical field of direct current transmission systems, in particular to a fault handling method for a flexible direct current transmission system, a fault handling device for a flexible direct current transmission system, and a flexible direct current transmission system. Background technique [0002] The DC transmission system mostly adopts overhead transmission lines, the transmission distance is long, the operating environment is complex, and the failure rate is high. DC line faults will affect power transmission and endanger the safe operation of power electronic equipment; due to the large DC transmission capacity, if the fault is not handled properly, it will cause serious accidents such as cascading faults and blackouts. In related technologies, a flexible direct current transmission system with fault self-clearing sub-modules is adopted, without the need for a DC circuit breaker, the fault can be quickly cl...

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 Patents(China)
IPC IPC(8): H02H7/26H02J3/36
CPCH02H7/268H02J3/36Y02E60/60
Inventor 董新洲蔡静
Owner TSINGHUA 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

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap