A Current Allocation Strategy Based Balancing Technique of Voltage Source String in Switch-Ladder Inverter and Its Switched-Capacitor Variety

A charge balancing method for series voltage source feeding multilevel inverters (MLI) based on current allocation control is presented. Unlike those MLIs based on isolated dc sources, the series-connected elements in a voltage source string, such as a battery or supercapacitor stack, cannot be by-p...

Full description

Saved in:
Bibliographic Details
Published in:IEEE transactions on energy conversion 2021-06, Vol.36 (2), p.1081-1089
Main Authors: Fong, Yat Chi, Cheng, Ka Wai Eric, Raman, S. Raghu
Format: Article
Language:English
Subjects:
Balancing
bidirectional switch
Capacitors
Circuits
Current distribution
Electric potential
energy storage system
Inverters
Modulation
multilevel inverter
Resource management
Strings
switched-capacitor circuits
Switches
Topology
Voltage
Voltage balancing
Voltage control
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:A charge balancing method for series voltage source feeding multilevel inverters (MLI) based on current allocation control is presented. Unlike those MLIs based on isolated dc sources, the series-connected elements in a voltage source string, such as a battery or supercapacitor stack, cannot be by-passed individually. This brings the problems of source imbalance and limited redundant switching states for current allocation control at high modulation index. In this article, the source balance in the switch-ladder inverter is achieved by allocating the current distribution. Furthermore, the balancing effectiveness is enhanced by a novel configuration combining a switched-capacitor (SC) circuit. The working principle and modulation index limit for the current allocation method is elucidated with a flow diagram and mathematical representation. The feasibility and operation of the proposed method and topology are successfully validated by a simulation study and the experimental results.
ISSN:0885-8969
1558-0059
DOI:10.1109/TEC.2020.3031224