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Voltage balancing method using phase-shifted PWM for stacked multicell converters
Ghias, Amer M.Y.M.; Pou Félix, Josep; Agelidis, Vassilios; Ciobotaru, Mihai
Universitat Politècnica de Catalunya. Departament d'Enginyeria Electrònica; Universitat Politècnica de Catalunya. TIEG - Grup d'Electrònica Industrial Terrassa
This paper proposes an active voltage balancing method for stacked multicell converters (SMC) using phase-shifted pulse-width modulation, which is easy to implement and extend to high number of levels. The proposed method balances the voltages of the capacitors by modifying the duty cycle of each switch of the SMC using a proportional controller. The crossed effect between capacitor currents and duty cycles is considered and is used for optimal capacitor voltage balance. The performance of the proposed voltage balancing method is verified by simulation for different operating conditions, such as unbalanced linear loads, non-linear loads and load transients.
Peer Reviewed
Àrees temàtiques de la UPC::Enginyeria electrònica
Electric current converters
Capacitors
Multilevel converter
Stacked multicell converter
Capacitor voltage balancing
Pulse-width modulation.
Ràdio--Freqüència modulada
Convertidors de corrent elèctric
Condensadors elèctrics
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