harmonic injection method for bridge arm multiplexing type MMC topology submodule capacity reduction

A harmonic injection and topological technology, applied in the high voltage field, can solve the problems of large volume and floor space, reduce the capacitance value of the MMC sub-module, and achieve the effect of reducing the capacitance value of the capacitor.

Active Publication Date: 2021-06-15
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
View PDF5 Cites 4 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the problems of the large volume and occupied area of ​​the half-bridge MMC mentioned in the above background technology, the present invention proposes a bridge-arm multiple

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
  • harmonic injection method for bridge arm multiplexing type MMC topology submodule capacity reduction
  • harmonic injection method for bridge arm multiplexing type MMC topology submodule capacity reduction
  • harmonic injection method for bridge arm multiplexing type MMC topology submodule capacity reduction

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0010] A method for reducing the capacity of the bridge arm multiplexed MMC topology sub-module harmonic injection method involved in the present invention will be described in detail below. It should be emphasized that the following description is only exemplary and not intended to limit the scope of the invention and its application.

[0011] The technical problem to be solved by the present invention is to realize the light weight of MMC by proposing a bridge arm reuse type MMC topology sub-module derating harmonic injection method.

[0012] The present invention adopts following technical scheme to realize:

[0013] Step 1: Increase the MMC modulation ratio by adding a full-bridge sub-module on the MMC bridge arm. Specific increase in the number of full-bridge sub-modules N F See formula (1) for details:

[0014]

[0015] In Equation 1, m is the modulation ratio of the traditional half-bridge MMC during normal operation, and m' is the actual modulation ratio of the s...

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 harmonic injection method for bridge arm multiplexing type MMC topology submodule capacity reduction, and belongs to the technical field of high voltage. A modular multilevel converter (MMC) uses a large number of sub-modules to approach the voltage of a bridge arm, so that the size and the occupied area of the MMC are large. On the basis, from the two aspects of topology and control strategies, the harmonic injection method for bridge arm multiplexing type MMC topology submodule capacity reduction is provided, and light weight of the MMC is achieved. The harmonic injection method is characterized in that a part of full-bridge sub-modules are added to the bridge arm of the MMC, so that the MMC has certain overmodulation output capacity. Through a bridge arm multiplexing idea, the number of MMC bridge arm sub-modules with overmodulation capability is the same as the number of conventional half-bridge MMC bridge arm sub-modules, and a bridge arm multiplexing type MMC topology is obtained. Based on a control strategy level, the invention provides a method for determining the frequency doubling current injection quantity of the bridge arm. Based on the topology and control strategy level, the capacitance value of the bridge arm multiplexing type MMC sub-module capacitor can be greatly reduced.

Description

technical field [0001] The invention relates to the field of high-voltage technology, in particular to a method for injecting harmonics into bridge-arm multiplexed MMC topology sub-modules for capacity reduction. Background technique [0002] Modular Multilevel Converter (MMC) has become the preferred converter topology for flexible DC grids due to its advantages of no commutation failure, black start capability, and high modularity. [0003] At present, half-bridge MMCs are mostly used in flexible and straight projects. Because MMCs use a large number of sub-modules to approximate the bridge arm voltage, their volume and footprint are huge. The volume of the capacitor in the sub-module occupies a large proportion in the whole sub-module. Based on this, a bridge-arm multiplexed MMC topology sub-module reduction harmonic injection method is proposed, which can greatly reduce the capacitance value of the MMC sub-module. Realize the lightweight of MMC. SUMMARY OF THE INVENT...

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): H02M7/219H02M7/483H02M7/5387
CPCH02M7/219H02M7/483H02M7/5387
Inventor 樊强许建中赵成勇
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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