Skip to main content

A Medium Voltage Three-Stage Power Converter Topology for Distribution Grid Scale Energy Storage Systems...

by Madhu Sudhan Chinthavali, Aswad Adib, Joao Onofre Pereira Pinto, Rafal P Wojda, Michael R Starke
Publication Type
Conference Paper
Book Title
2022 IEEE Energy Conversion Congress and Exposition (ECCE)
Publication Date
Page Numbers
1 to 8
Publisher Location
New Jersey, United States of America
Conference Name
IEEE Energy Conversion Congress and Exposition (ECCE) 2022
Conference Location
Detroit, Michigan, United States of America
Conference Sponsor
Conference Date

This work proposes a three-stage converter topology with a medium frequency isolation transformer for direct integration of energy storage systems into medium voltage distribution grids. The distributed architecture of the topology, using standard AC/DC converters, has been developed with the aim of plug-and-play capability and voltage and power scalability. The medium frequency transformer facilitates improved power density, while its 20:1 voltage translation capability enables the use of limited voltage level (500 Vdc) of the commercially available batteries. This paper presents the topology structure and details how it can be scaled to reach the full range of the distribution grid voltages and the required power levels. A transformer design for 500 Hz rated frequency is discussed. The control scheme of the converter equipped with voltage support, frequency support, and black start capabilities is also presented. Control hardware-in-the-loop results using OPAL-RT, with converter switching models connected to a weak IEEE-4 node test feeder modified for the aforementioned grid services, are provided to show the topology feasibility.