What is it about?
Using local communications, the local controllers associated with the converter cells exchange information. Both local carrier waveform and local capacitor voltage value are sent to the neighboring local controllers. By comparing their own local values with the neighboring ones, the system is able to automatically interleave the carriers and balance the capacitor voltages without the help of a centralized superviseur.
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Why is it important?
The output voltage or current regulation is centralized while balancing and interleaving are decentralized. This control method leads to simplified drasticaly the centralized part of the control and provides a simplier way to deal with a large number of cells.
Perspectives
Futrher works on practical implementation of local controllers using local links with optical fibers is under investigation to offer at last a complete solution to the community.
Marc Cousineau
Universite Federale Toulouse Midi-Pyrenees
Read the Original
This page is a summary of: Modular Control with Carrier Auto-Interleaving and Capacitor Voltage Balancing for Modular Multilevel Converters, IET Power Electronics, December 2018, the Institution of Engineering and Technology (the IET),
DOI: 10.1049/iet-pel.2018.5096.
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