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

Improved modularized multi-level current converter equivalent method

A modular multi-level, converter technology, applied in the efficiency field

Active Publication Date: 2018-11-30
NORTHEAST DIANLI UNIVERSITY +2
View PDF4 Cites 10 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to overcome the shortcomings of the existing equivalent methods and provide a scientific and reasonable method that comprehensively considers the blocking and non-blocking conditions of the half-bridge sub-module and solves the problem of diode value interpolation, which has strong applicability and simulation accuracy. Equivalent method of improved modular multilevel converter with high speed and good speed-up effect

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
  • Improved modularized multi-level current converter equivalent method
  • Improved modularized multi-level current converter equivalent method
  • Improved modularized multi-level current converter equivalent method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0092] The equivalent method of the improved modular multilevel converter of the present invention will be clearly and completely described below with reference to the accompanying drawings and examples.

[0093] The present invention is based on a half-bridge sub-module modular multilevel converter (ModularMultilevelConverter, MMC), its general topology is as follows figure 1 As shown, it is composed of three-phase six bridge arms, and each bridge arm is composed of N half-bridge sub-modules (Half-Bridge Sub-Module, HBSM) and reactors in series. The topology of the half-bridge sub-module is as follows: figure 2 Shown, including a capacitor, two reverse diodes and two insulated gate bipolar thyristor (Insulated-gateBipolarTransistor, IGBT or IGT).

[0094] S1: Determine the working state of the modular multilevel converter according to the working state of the half-bridge sub-module;

[0095] Step S1 defines the working state of the half-bridge sub-module, and determines 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 an improved modularized multi-level current converter equivalent method. Through distinguishing a semi-bridge sub-module working state in system normal operating and starting or failure, Thevenin equivalent is performed on a bridge arm while a system is positioned in a normal operating stage and a starting stage or the failure happens, and a locking condition and an non-locking condition are comprehensively considered, the improved modularized multi-level current converter equivalent method which is different from a bridge arm equivalent method only considering the system normal operating state is provided. While a semi-bridge sub-module is locked, a direction of a bridge arm current is frequently changed, and a diode is faced with a numerical interpolation problem,so the bridge arm current is caused to generate a distortion point. The method is capable of, while the semi-bridge sub-module is locked, modeling by using a built-in diode in PSCAD simulation software, enabling the numerical interpolation problem of the diode to be effectively solved, improving simulation precision, and apparent in acceleration effect. The method has the advantages of scientificrationality, simple calculation, convenient and easy operation, strong applicability, high simulation precision, and good acceleration effect.

Description

technical field [0001] The invention relates to the technical field of modularized multilevel converters, and relates to an equivalent method for an improved modularized multilevel converter. Background technique [0002] With the development of ModularMultilevelConverterbasedHighVoltageDirectCurrent (MMC-HVDC) projects to higher voltage levels and greater transmission power, the number of half-bridge sub-modules required is also increasing. In large-scale MMC -When simulating the HVDC system, it is necessary to invert a large number of ultra-high-order matrices, which makes the solution process very slow and takes a lot of time, which is not conducive to the application in actual engineering, so it is necessary to equivalent the detailed model. [0003] The existing equivalent methods are all based on the MMC steady state, without considering the blocking of the half-bridge sub-module. In the electromagnetic transient simulation, when the modular multilevel converter is in ...

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): G06F17/50
CPCG06F30/20
Inventor 金恩淑杨筱凡于新张亚菇崔勇包海龙郭强
Owner NORTHEAST DIANLI UNIVERSITY
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