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

Modular DC transformer based on discrete switched capacitor and modulation method thereof

A technology of DC transformers and switched capacitors, applied in the direction of converting DC power input to DC power output, adjusting electrical variables, instruments, etc. It solves problems such as online input of remaining modules, and achieves the effect of non-stop cutting, flexible modulation and control strategies, and reduction of manufacturing and design costs.

Active Publication Date: 2019-07-12
SHENZHEN POWER SUPPLY BUREAU +1
View PDF10 Cites 4 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, most of the existing technologies improve the voltage level and capacity of the DC transformer to meet the different DC voltage level connections between the high-voltage DC distribution network or the low-voltage DC micro-grid bus. It is difficult to achieve the flexibility of modulation and control, and it is difficult to achieve redundancy The online input of the remaining modules and the non-stop removal of the faulty modules have affected the overall reliability of the DC transformer; and the existing technology needs to configure more medium and high voltage DC circuit breakers in the external grid, thus improving the operation of the DC grid. loss and cost

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
  • Modular DC transformer based on discrete switched capacitor and modulation method thereof
  • Modular DC transformer based on discrete switched capacitor and modulation method thereof
  • Modular DC transformer based on discrete switched capacitor and modulation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Example 1, such as figure 1 As shown, the discrete switched capacitor dual-active full-bridge sub-module DSC-DABi under this embodiment includes a discrete switched capacitor module DSCi and a dual-active full-bridge sub-module DABi; the discrete switched capacitor dual-active full-bridge sub-module DSC -DABi is connected in series to the medium (high) voltage DC bus through the discrete switched capacitor module DSCi, and the discrete switched capacitor dual-active full-bridge sub-module DSC-DABi is connected to the first connection terminal on the low-voltage DC side of the dual-active full-bridge sub-module DABi. The second link terminal on the low-voltage DC side is connected in parallel to the low-voltage DC bus; on the medium (high) voltage DC side, multiple discrete switched capacitor dual-active full-bridge sub-modules DSC-DAB are used in series to improve the withstand voltage level of the DC transformer. The low-voltage interface side adopts a parallel structu...

Embodiment 2

[0046] Embodiment 2, as another embodiment of the present invention, such as figure 2 As shown, the difference from Embodiment 1 is only that the switching tube of the output circuit H2i of the dual-active full-bridge sub-module DABi is removed, specifically:

[0047] The first leg of the output circuit H2i includes a diode D 21i composed of the first high-side arm, and the diode D 22i composed of the first lower bridge arm; the second bridge arm of the output circuit H2i includes a diode D 23i composed of the second upper arm, and the diode D 24i Composed of the second lower bridge arm, the diode D 23i The negative parallel switch capacitor C 2i , Diode D 24i The positive parallel switch capacitor C 2i , switched capacitor C 2i The positive pole of the discretized switch capacitor is connected to the first connection terminal of the dual active full-bridge sub-module DSC-DABi, and the switch capacitor C 2i The negative pole of the discrete switching capacitor is conn...

Embodiment 3

[0048] Embodiment 3, as another kind of embodiment of the present invention, such as image 3 As shown, the difference from Embodiment 1 is only that the switched capacitor C is replaced by the discrete switched capacitor module DSC 2i ; Cause the dual active full-bridge submodule DSC-DABi of the discrete switched capacitor to include two discrete switched capacitor modules DSCi (discrete switched capacitor module DSC1i, discrete switched capacitor module DSC 2i ) and a dual-active full-bridge sub-module DABi; the discrete switched-capacitor dual-active full-bridge sub-module DSC-DABi is connected in series to the medium (high) voltage DC bus through the discrete switched-capacitor module DSC1i, and the discrete switched-capacitor dual-active full-bridge The sub-module DSC-DABi passes through the discretized switched capacitor module DSC 2i The first connection terminal on the low-voltage DC side and the second connection terminal on the low-voltage DC side are connected in p...

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 relates to a modular DC transformer based on a discrete switched capacitor. The modular DC transformer comprises one or more DSC- DAB sub-modules, input ends of the plurality of DSC-DABsub-modules are connected in series or in parallel, and output ends are connected in series or parallel. The DSC-DAB sub-modules comprise discrete switched capacitor modules, medium / high voltage DC conversion modules, high-frequency isolation conversion modules and low-voltage DC conversion modules which are connected in order. According to the invention, the modular design is adopted, the voltagechange speed of a high-frequency link is reduced, the overcurrent caused by the parasitic capacitance of the transformer is avoided, at the same time, the volume of the DC transformer is reduced, theproduction cost of the transformer is reduced, and the work such as installation, commissioning and transportation is facilitated.

Description

technical field [0001] The invention belongs to the technical field of direct current transformers, in particular to a modular direct current transformer based on discrete switched capacitors and a basic modulation method thereof. Background technique [0002] In the DC power grid, due to the maturity of the fully-controlled voltage source converter (VSC) technology, the flexible DC transmission technology has developed rapidly, and has great application prospects in wind farm access, isolated load power supply, and asynchronous grid networking. . In particular, the development of multi-terminal flexible DC power transmission provides an effective technical approach for DC networking and encourages the extension of flexible DC technology to the power distribution side. [0003] In order to realize the connection of high and medium voltage DC distribution busbars of DC distribution network with low voltage DC microgrid busbars or loads of different DC voltage levels, energy ...

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): H02M3/335H02H7/12
CPCH02H7/1213H02M3/3353H02M1/0058Y02B70/10
Inventor 孙谦浩赵彪孙杰宋强余占清曾嵘刘国伟赵宇明艾精文
Owner SHENZHEN POWER SUPPLY BUREAU
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