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Optimal injection of harmonics in circulating currents of modular multilevel converters for capacitor voltage ripple minimization
Picas Prat, Ricard; Pou Félix, Josep; Ceballos Recio, Salvador; Zaragoza Bertomeu, Jordi; Konstantinou, Georgios; Agelidis, Vassilios
Universitat Politècnica de Catalunya. Departament d'Enginyeria Electrònica; Universitat Politècnica de Catalunya. TIEG - Grup d'Electrònica Industrial Terrassa
This paper proposes an algorithm to calculate the optimal amplitude and phase of the harmonic current components that can be injected in the circulating currents of a modular multilevel converter (MMC) to minimize the capacitor voltage fluctuations. An optimal second harmonic component and an optimal set of second and fourth harmonic components are proposed. Simulation results are obtained in MATLAB/Simulink environment to study the effectiveness of the calculated optimal currents. Selected experimental results have been obtained from an MMC laboratory prototype, testing the effects of the circulating currents. The reported results demonstrate the effectiveness of using a fourth harmonic component in the circulating current, which improves the effect of the second harmonic on reducing the capacitor voltage fluctuations.
Àrees temàtiques de la UPC::Energies::Energia elèctrica
Àrees temàtiques de la UPC::Enginyeria electrònica
Electric current converters.
Power electronics.
Capacitors
Capacitor voltage fluctuations
Capacitor voltage ripple
Circulating current
Harmonic currents
MATLAB/Simulink environment
Modular multi-level converters
Second and fourth harmonics
Second harmonic component
Convertidors altern-continu
Convertidors
Condensadors elèctrics
Condensadors electrònics
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