Abb Schweiz Ag

Abb Technology Ltd

Abb Power Grids Switzerland Ag

Aravind Mohanaveeramani

Jean-Philippe Hasler

Alireza Nami

Suman Maiti

A method for controlling a modular multilevel converter to reduce the lower order harmonics generated by the converter is provided. The method may also reduce the overall switching loss of the converter by switching the switches close to fundamental switching frequencies while still reducing the lower order harmonics that are generated.

Method and device for damping voltage harmonics in a multilevel power converter

A method for reducing lower order harmonics of a power converter includes, for each phase leg of the converter: obtaining a voltage reference for the phase leg; for a present sample, obtaining a flux error of the output voltage of the leg; dividing the first sample flux error by a time period to obtain an average voltage error over said time period; subtracting an obtained processed average voltage error, based on the average voltage error, from the voltage reference to obtain a modified voltage reference for the phase leg; and providing the modified voltage reference to a modulation unit of the converter for controlling the phase leg.

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Chennai, India

Aravind Mohanaveeramani