Unlock instant, AI-driven research and patent intelligence for your innovation.

Modular multi-level converter arm current control methods

A modular multi-level, converter bridge technology, applied in the direction of converting AC power input to DC power output, electrical components, output power conversion devices, etc., can solve the problem of control command bias, control command deviation, The voltage imbalance of the upper and lower bridge arm sub-modules can reduce the stress difference, prolong the service cycle, and suppress the bridge arm current asymmetry.

Active Publication Date: 2014-05-21
NR ELECTRIC CO LTD +3
View PDF7 Cites 9 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] 1. There is a bias in the control instructions issued by the upper controller;
[0008] 2. The voltage of the sub-modules of the upper and lower bridge arms is unbalanced, and the voltage generated by the actual superposition deviates from the control command

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 multi-level converter arm current control methods
  • Modular multi-level converter arm current control methods
  • Modular multi-level converter arm current control methods

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0028] The technical solutions of the present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0029] attached figure 2 It is a schematic diagram of a control method for superimposing an opposite additional conduction number instruction in the upper and lower bridge arm control instructions. I bu_rms and I bd_rms are the fundamental current RMS values ​​of the upper bridge arm and the lower bridge arm of a certain phase unit, I diff Is the effective value of the fundamental wave of the lower bridge arm current I bd_rms and the fundamental RMS value of the upper arm current I bu_rms difference. Ideally, the difference is about 0 due to the symmetrical currents of the upper and lower bridge arms; diff May not be 0. ΔN u and ΔN d Respectively, additional instructions for increasing or decreasing the number of conductions of sub-modules, and the additional instructions for the number of conductions ΔN i...

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 two modular multi-level converter arm current control methods. A basic control method is improved, reverse additional conduction number instructions or additional voltage instructions are overlaid in an upper arm control instruction and a lower arm control instruction, so that dissymmetry of arm current caused by polarization of the control instruction issued by an upper controller or unbalanced upper arm sub-module voltage and lower arm sub-module voltage is decreased and even restrained, and differences of stress applied to an upper arm and a lower arm are reduced.

Description

technical field [0001] The invention belongs to the technical field of flexible direct current transmission in power systems, and in particular relates to a control method for bridge arm current of a modular multilevel converter. Background technique [0002] Modular multi-level converter is a new type of converter suitable for high-voltage applications that has attracted much attention in recent years. It adopts the method of cascading sub-modules. The AC voltage output by the converter is close to a sine wave, thereby reducing the harmonic content in the output voltage. Its appearance solves the problem of series voltage equalization in the two-level voltage source converter, and has broad application prospects. [0003] The schematic diagram of the main circuit topology of the three-phase modular multilevel converter (MMC) is as follows: figure 1 As shown in (a), it contains 3 phase units, each phase unit includes two upper and lower bridge arms, and each bridge arm is 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): H02M7/72
CPCH02M7/4835
Inventor 汪楠楠田杰董云龙刘海彬卢宇胡兆庆李钢张静陆翌
Owner NR ELECTRIC CO LTD
Features
  • R&D
  • Intellectual Property
  • Life Sciences
  • Materials
  • Tech Scout
Why Patsnap Eureka
  • Unparalleled Data Quality
  • Higher Quality Content
  • 60% Fewer Hallucinations
Social media
Patsnap Eureka Blog
Learn More

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2025 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com