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

A method and system for updating the status of mmc capacitors

A state update and capacitance technology, which is applied in the direction of electrical components, output power conversion devices, AC power input conversion to DC power output, etc., can solve the problem of high cost of measurement system, heavy burden of hardware measurement system, affecting the accuracy of capacitance state update, Capacitor voltage equalization effect and other issues to achieve the effect of improving calculation accuracy, reducing hardware cost and measurement burden, and reducing the number

Active Publication Date: 2021-10-08
HUAZHONG UNIV OF SCI & TECH
View PDF0 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to achieve MMC voltage equalization control, output current control, etc., each MMC sub-module needs to be equipped with a voltage sensor to measure its capacitor voltage, which brings a large burden to the hardware measurement system, and a large number of high-precision voltage sensors will also cause measurement The cost of the system is higher
By reducing the number of voltage sensors, the hardware measurement system can be simplified, but it will affect the update accuracy of the capacitor state (including capacitor voltage and capacitance) and the effect of capacitor voltage equalization
In related technologies, there is no research on configuring voltage sensors in terms of overall performance 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
  • A method and system for updating the status of mmc capacitors
  • A method and system for updating the status of mmc capacitors
  • A method and system for updating the status of mmc capacitors

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0027] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not constitute a conflict with each other.

[0028] In the present invention, the terms "first", "second" and the like (if any) in the present invention and drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence.

[0029] figure 1 It is a flow chart of the method for updating the state of the MMC capacitance proposed by the present invention. refer to figure 1 , combined w...

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 method and system for updating the state of an MMC capacitor, belonging to the field of MMC capacitor voltage estimation and capacitor state monitoring. Each bridge arm of the MMC is provided with N MMC sub-modules connected in series, and the N MMC sub-modules are divided into A plurality of sub-module groups, the method includes: obtaining the current group capacitor voltage, current current and last moment historical current of the first sub-module group, and the current switch state of each MMC sub-module in the first sub-module group, the first sub-module group The module group is any sub-module group in the MMC; predict the capacitor voltage prediction value of each MMC sub-module according to the current current, historical current, and current switch state; use the current group capacitor voltage of the first sub-module group to predict the capacitor voltage The value is corrected to obtain the corrected value of the capacitor voltage of each MMC sub-module. Measure the group capacitance voltage of each sub-module group of the MMC, and obtain the capacitance voltage of each MMC sub-module in the MMC through prediction and correction, reduce the number of voltage sensors, and reduce the MMC hardware cost and measurement burden.

Description

technical field [0001] The invention belongs to the fields of MMC capacitance voltage estimation and capacitance state monitoring, and more specifically relates to a method and system for updating the state of MMC capacitance. Background technique [0002] Modular Multilevel Converter (MMC) has the advantages of high efficiency, modularization, flexible expandability, and high output waveform quality, and has attracted widespread attention in the field of medium and high voltage applications. [0003] In order to achieve MMC voltage equalization control, output current control, etc., each MMC sub-module needs to be equipped with a voltage sensor to measure its capacitor voltage, which brings a large burden to the hardware measurement system, and a large number of high-precision voltage sensors will also cause measurement The cost of the system is higher. By reducing the number of voltage sensors, the hardware measurement system can be simplified, but it will affect the upda...

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 Patents(China)
IPC IPC(8): H02M7/483
CPCH02M7/483H02M7/4835
Inventor 彭力王臻肖云涛
Owner HUAZHONG UNIV OF SCI & TECH
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