Diode clamping hybrid MMC circuit with self-voltage-sharing capability

A diode clamping and self-balancing technology, applied in electrical components, output power conversion devices, AC power input conversion to DC power output, etc., can solve the problems of large capacitance voltage difference, unfavorable recovery, and high cost. The effect of voltage equalization and device cost reduction

Inactive Publication Date: 2019-12-03
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
View PDF12 Cites 4 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the number of modules used in these two topologies is large and the cost is relatively high. Therefore, some people now propose to use a full-bridge-half-bridge hybrid topology, as shown in the attached figure 1 As shown, the number of components is reduced, but the vol

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
  • Diode clamping hybrid MMC circuit with self-voltage-sharing capability
  • Diode clamping hybrid MMC circuit with self-voltage-sharing capability
  • Diode clamping hybrid MMC circuit with self-voltage-sharing capability

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0023] The present invention proposes a diode-clamp hybrid MMC circuit with self-equalizing capability, such as figure 2 As shown, multiple hybrid sub-modules Hybrid SM are connected in series on the bridge arm of the MMC circuit, and each hybrid sub-module Hybrid SM consists of a half-bridge sub-module HBSM, a full-bridge sub-module D-FBSM and a clamping diode D1 , where the negative pole of the clamping diode D1 is connected to the positive pole of the capacitor C1 of the half-bridge sub-module HBSM, the positive pole of the clamping diode D1 is connected to the positive pole of the capacitor C2 of the full-bridge sub-module D-FBSM, the negative pole of the half-bridge sub-module HBSM and the full-bridge The positive pole of the sub-module D-FBSM is connected.

[0024] The MMC circuit includes three upper bridge arms and three lower bridge arms symmetrically arranged, the upper nodes of the three upper bridge arms are connected, and the lower nodes are respectively connecte...

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 belongs to the power electronics technology field and especially relates to a diode clamping hybrid MMC circuit with a self-voltage-sharing capability. A bridge arm of the MMC circuit isconnected in series with a plurality of hybrid circuit sub-modules Hybrid SM. Each hybrid circuit sub-module Hybrid SM is composed of a half-bridge sub-module HBSM, a full-bridge sub-module D-FBSM and a clamping diode D1. A negative electrode of the clamping diode D1 is connected with a positive electrode of a capacitor C1 of the half-bridge sub-module HBSM, the positive electrode of the clampingdiode D1 is connected to the positive electrode of a capacitor C2 of the full-bridge sub-module D-FBSM, and the negative electrode of the half-bridge sub-module HBSM is connected with the positive electrode of the full-bridge sub-module D-FBSM. When the clamping diode D1 is conducted, automatic voltage sharing in a cascade unit is realized; and under a fault condition, a capacitor of the half-bridge sub-module is reversely connected in series into a fault loop and acts with the capacitor of the full-bridge sub-module to remove a fault current.

Description

technical field [0001] The invention belongs to the technical field of power electronics, and in particular relates to a diode-clamp hybrid MMC circuit with self-equalizing capability. Background technique [0002] Due to its modular design, the Modular Multi-level Converter (MMC) makes it easier to upgrade the system capacity and has stronger scalability. In actual operation, the MMC-HVDCs currently in operation are all back-to-back projects with no transmission distance, or use cables as their transmission lines. However, at the same voltage level and transmission power, the cost of cables is much higher than that of overhead lines. At the same time, due to the "skin effect" during the operation of the cable, the space charge problem and the insulation problem are also very serious. Therefore, in the context of the development of long-distance, high-voltage, and large-capacity DC transmission, the use of overhead line transmission with obvious economic and technological ...

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): H02M7/00H02M7/483H02M7/5387H02M1/32
CPCH02M1/32H02M7/00H02M7/483H02M7/5387H02M1/325
Inventor 王毅谭开东冀茂
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