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Circulating current injection methods based on instantaneous information for the modular multilevel converter
Pou Félix, Josep; Ceballos Recio, Salvador; Konstantinou, Georgios; Agelidis, Vassilios; Picas Prat, Ricard; Zaragoza Bertomeu, Jordi
Universitat Politècnica de Catalunya. Departament d'Enginyeria Electrònica; Universitat Politècnica de Catalunya. TIEG - Grup d'Electrònica Industrial Terrassa
This paper studies different circulating current references for the modular multilevel converter. The circulating current references are obtained from the instantaneous values of the output current and modulation signal of the phase leg. Therefore, the determination of the amplitude and phase of the output current is not needed, which is a significant improvement compared to other methods such as those based on injecting specific harmonics in the circulating currents. Among the different methods studied in this paper, a new method is introduced, which is able to reduce the capacitor voltage ripples compared to the other methods. A closed-loop control is also proposed which is able to track the circulating current references. With the discussed methods, the average values of the capacitor voltages are maintained at their reference while the voltage ripples are kept low. Experimental results are presented to demonstrate the effectiveness of the proposed and discussed methods.
Peer Reviewed
Àrees temàtiques de la UPC::Enginyeria electrònica
Electric current converters
Electric currents
Arm current
capacitor voltage ripple
circulating current control
modular multilevel converter (MMC)
Convertidors de corrent elèctric
Corrents elèctrics
info:eu-repo/semantics/publishedVersion
Article
Institute of Electrical and Electronics Engineers (IEEE)
         

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