Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Fault protection circuit and method for submodule of modular multilevel converter

A modular multi-level, fault-protection technology, applied in the direction of electrical components, output power conversion devices, etc., can solve problems affecting changes in bridge arm voltage and current

Active Publication Date: 2012-11-28
ZHUZHOU NAT ENG RES CENT OF CONVERTERS
View PDF3 Cites 58 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the reaction time from the fault occurrence to the T2 pulse blockade is about 10us, and the closing time of K is about 10ms. Since the action time of K is longer, the fault current spreads to the system at this time, which will affect the same bridge arm or other Changes in arm voltage and current

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
  • Fault protection circuit and method for submodule of modular multilevel converter
  • Fault protection circuit and method for submodule of modular multilevel converter
  • Fault protection circuit and method for submodule of modular multilevel converter

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0041]In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments It is a part of embodiments of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0042] see figure 2 It shows a schematic structural diagram of Embodiment 1 of a fault protection circuit for a modular multilevel converter provided by the present invention, including: a support capacitor C, a voltage equalizing resistor R, a first switching tube T1, a second switching tube T2, The first diode D1, the second diode D2, the ...

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 protection circuit for a submodule of a modular multilevel converter. When a second switch tube T2 is on, and a first switch tube T1 is off and is short circuited, a submodule controller 101 controls the second switch tube T2 to block the conduction between a pulse and a second thyristor D4, and sends an off signal to a by-pass switch at the same time. Due to the long action time of the by-pass switch K, the conduction of the second thyristor D4 can implement the rapid bypass of a fault submodule. According to the fault protection circuit and method for the submodule of the modular multilevel converter provided by the invention, when the second switch tube T2 is on, and the first switch tube T1 is short circuited, fault current can be prevented from expanding to a system effectively, so that the voltage stability at a direct current side is ensured and the requirements of the system on high reliability and safe operation are met.

Description

technical field [0001] The invention belongs to the technical field of flexible direct current transmission, and in particular relates to a sub-module fault protection circuit and method of a modular multilevel converter. Background technique [0002] Flexible DC transmission technology is a new type of high-voltage DC transmission technology based on voltage source converters. With its no commutation failure problem, it can realize fast decoupling control of active and reactive power and the advantages of low harmonic content. It is more widely used in the fields of distributed generation grid connection, asynchronous interconnection of AC system, multi-terminal DC transmission and capacity expansion of urban distribution network. [0003] Modular multilevel converter, as one of the voltage source converter topologies to realize flexible DC transmission engineering, has received great attention in recent years. Its basic circuit unit is a sub-module, and the structural dia...

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
IPC IPC(8): H02M1/32
Inventor 敬华兵吴强龚芬唐剑钊邓明翟文杰
Owner ZHUZHOU NAT ENG RES CENT OF CONVERTERS
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com