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

Capacitance balancing control method for three-phase full-bridge modular multilevel converter legs

A modular multi-level converter bridge technology, applied in the direction of converting AC power input to DC power output, irreversible DC power input to AC power output, electrical components, etc., can solve the problem of full bridge sub-modules Complicated switching states, incomplete application of full-bridge modular multilevel converters, etc., to achieve the effect of reducing switching frequency and cost

Active Publication Date: 2013-08-21
STATE GRID CORP OF CHINA +2
View PDF4 Cites 27 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above control method optimizes the switching frequency of the half-bridge modular multilevel converter sub-module to a certain extent, but compared with the half-bridge sub-module, the switching state of the full-bridge sub-module is more complicated, and the full-bridge The lower bridge arm of the bipolar DC short-circuit fault needs to output reverse voltage, so the above control method is not completely applicable to the full-bridge modular multilevel converter

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
  • Capacitance balancing control method for three-phase full-bridge modular multilevel converter legs
  • Capacitance balancing control method for three-phase full-bridge modular multilevel converter legs
  • Capacitance balancing control method for three-phase full-bridge modular multilevel converter legs

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0036] The specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0037] Aiming at the internal capacitor balance control of the bridge arm of the full-bridge modular level converter, the invention provides a general balance control method for the capacitor voltage of the sub-modules in the bridge arm. In the present invention, by comparing the capacitance voltage of each switch state submodule of the bridge arm capacitance, and according to the current direction of the bridge arm current and the upper layer control instruction, the switch state of the relevant submodule in the bridge arm is adjusted to realize the response to the upper layer control instruction. At the same time, it is ensured that the capacitor voltage of the sub-modules in the bridge arm is relatively consistent. According to the designed balance control method, each switching device of the sub-module has the same 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 relates to the technical field of power and electronics, and discloses a capacitance balancing control method for three-phase full-bridge modular multilevel converter legs. Based on an on-off state of a current sub-module, leg current and an instruction for inputting a sub-module, the sub-modules which are positively input and reversely input at the next moment are determined, so that balancing control of capacitance and voltage of the sub-modules inside the legs is achieved. The capacitance balancing control method utilizes the on-off state of full-bridge sub-modules to the largest extent, enables the on-off frequency of components in the sub-modules to be the same as far as possible, and facilitates uniform design. Compared with a half-bridge structure, under the same control condition and control requirement, a full-bridge structure reduces the on-off frequency of each component. The control method is applied to operation and control of a converter on a direct current side under a normal condition or a fault condition, and control switching is not needed.

Description

technical field [0001] The invention belongs to the technical field of flexible DC power transmission in power systems, and in particular relates to a method for controlling bridge arm capacitance balance of a three-phase full-bridge modular multilevel converter. Background technique [0002] Modular Multilevel Converter (MMC) adopts a new type of multilevel topology that is currently popular in the world. Its core unit - sub-module (Sub Module, SM, figure 1 shown) can be half-bridge or full-bridge. Compared with the half-bridge modular multilevel converter, its remarkable feature is that it has the ability to ride through DC faults. The full-bridge sub-module consists of four self-turn-off power electronic switching devices with anti-parallel diodes and a capacitor. The basic topology of a three-phase full-bridge converter is as follows: figure 2 As shown, it consists of three phase units (Phase Module or Phase Unite, figure 2 1) in the composition, each phase unit c...

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): H02M7/48
CPCH02M7/483H02M7/4835
Inventor 汤广福孔明林畅李文津马巍巍
Owner STATE GRID CORP OF CHINA
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