DAMPING HIGHER ORDER HARMONICS IN AVERAGE DC LINK VOLTAGES

Abstract: a converter system includes at least two branches, where each branch includes an ac-to-dc converter and a dc link cascade connected with each other. a method includes: determining at least two ac-side currents, each of which is input into one of the ac-to-dc converters; determining from the ac-side currents, a voltage reference for each of the ac-to-dc converters; determining a dc link ripple indicator; determining a converter reference correction from the dc link ripple indicator, such that a higher order harmonic in the average dc link voltage is damped; determining corrected voltage references for the ac-to-dc converter by adding the converter reference correction to the voltage references of the ac-to-dc converters or by adding the converter reference correction to an average current reference for the ac-to-dc converters; and controlling the ac-to-dc converters with the respective corrected voltage references.

Inventor(s): Ioannis Tsoumas, Lennart Harnefors

CPC Classification: H02M1/12 (APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF (transformers ; dynamo-electric converters ; controlling transformers, reactors or choke coils, control or regulation of electric motors, generators or dynamo-electric converters ))

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