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

Isolated-type DC-DC converter based on MMCs and control method of isolated-type DC-DC converter

A DC converter, isolated technology, applied in the direction of converting DC power input to DC power output, control/regulation system, output power conversion device, etc., can solve the problem that VSC-HVDC and LCC-HVDC cannot be directly connected, etc. To achieve the effect of trend reversal and reliable interconnection

Active Publication Date: 2019-05-14
CHINA ELECTRIC POWER RES INST +3
View PDF4 Cites 13 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, LCC-HVDC adopts thyristor device phase-controlled converter LCC, when the power flow reverses, the voltage polarity reverses and the current direction remains unchanged, and VSC-HVDC adopts a voltage source converter, and the voltage polarity does not change when the power flow reverses. Direction, VSC-HVDC and LCC-HVDC cannot be directly connected, how to connect VSC-HVDC and LCC-HVDC becomes an important research topic

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
  • Isolated-type DC-DC converter based on MMCs and control method of isolated-type DC-DC converter
  • Isolated-type DC-DC converter based on MMCs and control method of isolated-type DC-DC converter
  • Isolated-type DC-DC converter based on MMCs and control method of isolated-type DC-DC converter

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0081] In order to better understand the present invention, the content of the present invention will be further described below in conjunction with the accompanying drawings and examples. The high-power DC-DC converter provided by the present invention has the function of voltage polarity inversion and is used to connect VSC-HVDC and LCC-HVDC. - DC converter, topology and polarity inversion controller design have become important research topics.

[0082] Such as figure 1 As shown, it is the DC-DC converter of the hybrid DC system. Based on the characteristics of VSC-HVDC and LCC-HVDC, it can be concluded that the interconnection interface between VSC-HVDC and LCC-HVDC, that is, the DC-DC converter should meet the following technical requirements:

[0083] 1) Possess three mode control functions of constant voltage, constant current and constant power: the constant voltage control mode requires the ability to control the output side voltage constant or the input side voltage...

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 an isolated-type DC-DC converter based on MMCs and a control method of the isolated-type DC-DC converter. The isolated-type DC-DC converter comprises a high-frequency transformer, the first MMC and the second MMC; one side of the high-frequency transformer is connected with a high-voltage flexible direct-current transmission network VSC-HVDC based on a voltage source type converter through the first MMC; the other side of the high-frequency transformer is connected with a high-voltage direct-current transmission network LCC-HVDC based on a line commutated converter through the second MMC; sub-modules of all bridge arms in the first MMC are each of a half-bridge structure; and sub-modules of all bridge arms in the second MMC are each of a full-bridge structure. The topological structure combining the full-bridge MMC and the half-bridge MMC is adopted to realize reliable interconnection of LCC-HVDC and VSC-HVDC, safe and stable operation of a hybrid direct-currentinterconnection system is supported, and a foundation is laid for the situation that new energy sources adopt the hybrid direct-current interconnection system for outgoing on large scale.

Description

technical field [0001] The invention relates to the field of hybrid DC interconnection grids, in particular to an MMC-based isolated DC-DC converter and a control method. Background technique [0002] In recent years, new energy power generation has developed rapidly. As of the end of 2017, only China's installed capacity of wind power reached 164 million kilowatts, and the installed capacity of photovoltaic power generation reached 130 million kilowatts, ranking first in the world. However, due to the reverse distribution of new energy resources and loads in most cases, large-scale new energy long-distance transmission has become the main way for new energy to be delivered and consumed. The transmission of new energy with weak synchronous support or even without synchronous support has become a research hotspot. With the development of DC transmission technology, large-scale new energy has become a development trend through DC long-distance transmission. [0003] After de...

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): H02M3/335H02J3/36
CPCY02E60/60
Inventor 刘超迟永宁朱淼李琰陈阳
Owner CHINA ELECTRIC POWER RES INST
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