Single-arm blocking modular multilevel converter for unidirectional power flow

A modular multi-level converter technology, applied in the direction of converting AC power input to DC power output, AC network circuits, electrical components, etc., can solve the problems of inability to adapt to DC voltage operation control, unfavorable DC fault recovery, and application occasions Restrictions and other issues

Active Publication Date: 2018-10-19
TSINGHUA UNIV +1
View PDF6 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the flexible DC converter station adopting this scheme can only be used as the power receiving end of the DC transmission system, and cannot be used as the power transmitting end of the transmission system, so the application occasions are limited; The DC voltage operating range of the DC transmission system is very limited, which cannot meet the needs of DC voltage operation control in a large range, which is not conducive to DC fault recovery and lacks adaptability to AC grid voltage fluctuations

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
  • Single-arm blocking modular multilevel converter for unidirectional power flow
  • Single-arm blocking modular multilevel converter for unidirectional power flow
  • Single-arm blocking modular multilevel converter for unidirectional power flow

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 2

[0092] The following is combined with Embodiment 2 (this embodiment is the originating system) and Figure 13 To describe the system:

[0093] In this embodiment, the rated line voltage U of the originating AC system s 220kV, bipolar maximum transmission active power is 60MW, and the relevant parameters of single-side bridge arm blocking modular multilevel converter are shown in Table 2.

[0094] Table 2

[0095]

[0096] In this embodiment, the upper bridge arm blocking type modular multilevel converter 3 is used as the positive pole converter of the single side bridge arm blocking type modular multilevel converter, and the lower bridge arm blocking type The modular multilevel converter 4 is used as the negative converter of the one-side bridge arm blocking type modular multilevel converter; The positive DC busbar, the negative pole DC- on the DC side of the positive converter is connected to the grounding pole; the positive pole DC+ on the DC side of the negative conve...

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 single-side bridge arm blocking type modular multilevel converter suitable for unidirectional power flow proposed by the invention belongs to the field of power electronics technology and power transmission and distribution, and includes a single-side bridge arm blocking type only suitable for the receiving end. A modular multilevel converter and a single-side bridge-arm blocking type modular multilevel converter suitable for both the receiving end and the transmitting end; wherein the former includes first and second diode strings and Three phases with the same structure, each phase consists of one bridge arm based on the B-type sub-module, the other bridge arm based on the diagonal bridge sub-module, and the third diode string in series; the latter includes the same structure. Three-phase, each phase is composed of one side bridge arm based on the diagonal bridge sub-module and the other side bridge arm of the B / U hybrid type based on the mixture of the B-type sub-module and the unipolar voltage sub-module in series; The converter can quickly clear the DC fault current at low cost, and can provide dynamic reactive power support for the AC grid during DC faults in most applications.

Description

technical field [0001] The invention belongs to the field of power electronics technology and power transmission and distribution, in particular to a single-side bridge arm blocking modular multilevel converter suitable for unidirectional power flow. Background technique [0002] Compared with the traditional HVDC transmission technology, the flexible HVDC transmission technology uses full-control switching devices to control the converter, so it has the advantages of flexible control, free compensation of reactive power, and conversion without relying on the AC system. have been extensively researched and applied. Especially the flexible HVDC power transmission system based on the modular multilevel converter structure, many projects at home and abroad have been put into operation or are under construction. [0003] How to deal with DC short-circuit faults is an urgent technical problem to be solved in flexible DC transmission technology. Existing flexible HVDC transmissi...

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): H02M7/483H02J5/00H02J3/18
CPCH02J3/1821H02J5/00H02M7/483H02M1/007H02M7/4835H02M1/0095
Inventor 魏应冬于心宇姜齐荣袁志昌谢小荣张树卿刘文华宋强韩英铎
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