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

Modular medium-voltage waveform generator loss equalization control method and system

A technology of loss leveling and control method, applied in the direction of eliminating/reducing asymmetry in polyphase network, power transmission AC network, converting AC power input to DC power output, etc. Module operation reliability, increase device loss and other issues, to achieve the effect of improving balance control performance, improving control stability, and improving heat balance distribution

Active Publication Date: 2021-03-16
CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
View PDF7 Cites 1 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Existing literature has proposed related solutions to the problems of voltage ripple, energy imbalance, and output current harmonic suppression caused by this structure, but these methods only improve a certain operating characteristic, and it is difficult to control the above-mentioned performances; At the same time, the existing research did not consider the internal wear leveling of the sub-modules when distributing the switching signals of the sub-modules, which caused some switching devices in some sub-modules to operate for a long time, which increased the loss of the devices and affected the operational reliability of the sub-modules.

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 medium-voltage waveform generator loss equalization control method and system
  • Modular medium-voltage waveform generator loss equalization control method and system
  • Modular medium-voltage waveform generator loss equalization control method and system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0035] Embodiments of the present invention include the following steps:

[0036] Step 1. Define this control period as k period, and the next control period as k+1 period. With the help of the modular medium voltage waveform generator, the bridge arm current i of the four bridge arms in the k period j (k), extracting the input current i of k cycles s (k), output current i o (k), internal circulation i z (k), wherein, j represents any bridge arm, j=1,2,3,4, k represents any moment, k=0,1,2,..;

[0037] Step 2. According to the extracted input current i of k periods s (k), output current i o (k), internal circulation i z (k), combined with k-period AC input voltage u s (k), the predicted value u of the bridge arm voltage of the four bridge arms in the k+1 cycle j (k+1), determine the input current prediction value i of the k+1 cycle s (k+1), output current prediction value i o (k+1), predicted value of internal circulation i z (k+1);

[0038] Step 3. According to the...

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 discloses a modular medium-voltage waveform generator loss equalization control method and system. The method comprises the steps: taking each bridge arm of a modular medium-voltage waveform generator as a control target, building a model prediction control evaluation function comprising input, output and internal control variables, taking the optimal tracking performance as a control target, and selecting the optimal level number of each bridge arm; and for each full-bridge sub-module in one bridge arm, when a switching signal is configured, configuring the switching state of apower switching device in a balanced manner by taking equal action times of a left bridge arm and a right bridge arm of the sub-module as a target, so that on the premise of ensuring accurate trackingof input current, output current and internal circulation and sub-module capacitor voltage balance control, the effect of balanced distribution of internal losses of the modular medium-voltage waveform generator is achieved, and the operation reliability of the modular medium-voltage waveform generator is improved.

Description

technical field [0001] The invention relates to the technical field of power electronic control, in particular to a method and system for controlling loss equalization of a modular medium-voltage waveform generator. Background technique [0002] The modular medium-voltage waveform generator can generate specific sine waves, various harmonics, triangular waves, square waves, voltage dips, voltage swells and other power signals, and has the ability to measure the impedance of new energy microgrids and build power grid simulations. Platform, providing ship shore power supply and other functions, widely used in the field of industrial production. The modular medium-voltage waveform generator adopts a modular multi-level structure to improve device redundancy, output power quality and power level. The sub-module adopts a full-bridge structure, which can realize DC or AC power conversion. Existing literature has proposed related solutions to the problems of voltage ripple, 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): H02M1/00H02M7/00H02J3/26H02J3/36
CPCH02M1/00H02M7/00H02J3/26H02J3/36H02J2203/20Y02E40/50Y02E60/60
Inventor 岳雨霏杨禧金家兴唐欣贾奥祺王世能马铃翔李迎奥
Owner CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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