An Isolated Resonant Mode Modular Converter with Flexible Modulation and Variety of Configurations for MVDC Application
Author(s)
Xiang, X
Zhang, X
Chaffey, G
Green, T
Type
Journal Article
Abstract
The dc tap or dc transformer will play an important role in interfacing different voltages of dc links in dc grids. This paper presents an isolated resonant mode modular converter (RMMC) with flexible modulation and assorted configurations to satisfy a wide variety of interface requirements for medium voltage dc (MVDC) networks. The transformer-less RMMC, as introduced in the literature, implemented a restricted modulation scheme leading to a very limited range of step-ratio and the diode rectifier resulted in unidirectional power flow. Both of these limitations are removed in this proposal and galvanic isolation has also been added. Moreover, this new RMMC approach can serve as a building block for variety of configurations. Two such derived topologies are given, which inherently balance the voltage and current between different constituent circuits and realize the high power rating conversion for very low or very high step-ratio application. The theoretical analysis is validated by a set of full-scale simulations and a down-scaled experimental prototype. The results illustrate that this isolated RMMC and its derivatives have promising features for dc taps or dc transformers in MVDC applications.
Date Issued
2017-09-01
Date Acceptance
2017-07-29
Citation
IEEE Transactions on Power Delivery, 2017, 33 (1), pp.508-519
ISSN
0885-8977
Publisher
Institute of Electrical and Electronics Engineers
Start Page
508
End Page
519
Journal / Book Title
IEEE Transactions on Power Delivery
Volume
33
Issue
1
Copyright Statement
This work is licensed under a Creative Commons Attribution 3.0 License. For more information, see http://creativecommons.org/licenses/by/3.0/.
License URL
Sponsor
Engineering & Physical Science Research Council (EPSRC)
Engineering & Physical Science Research Council (EPSRC)
Grant Number
EP/K006312/1
EP/K036327/1
Subjects
Science & Technology
Technology
Engineering, Electrical & Electronic
Engineering
Modular multilevel converter
resonant dc-dc conversion
dc tap
dc transformer
MVDC
DC-DC CONVERTERS
POWER-CONVERSION SYSTEM
WIND ENERGY-SYSTEMS
DC/DC CONVERTERS
BRIDGE CONVERTER
TRANSMISSION NETWORKS
HVDC APPLICATIONS
VOLTAGE
GRIDS
TRANSFORMERS
0906 Electrical And Electronic Engineering
Energy
Publication Status
Published