Capacitor voltage balance limits in a multilevel-converter-based energy storage system
Document typeConference report
Rights accessOpen Access
All rights reserved. This work is protected by the corresponding intellectual and industrial property rights. Without prejudice to any existing legal exemptions, reproduction, distribution, public communication or transformation of this work are prohibited without permission of the copyright holder
This paper studies an energy storage system based on a three-level DC-DC converter and a gridconnected neutral-point-clamped inverter. The main advantages of this multilevel power conversion system are highlighted and the neutral-point voltage oscillations are analyzed. A modulation algorithm for the DC-DC converter which includes the neutral-point voltage balance control is used to improve the voltage balancing capabilities of the inverter. Some figures are presented to show the extended operating areas without neutral-point voltage oscillations thanks to the contribution of the DC-DC converter to the voltage balance. Finally, some guidelines to size the DC-link capacitors are given for a practical application.
CitationBurusteta, S. [et al.]. Capacitor voltage balance limits in a multilevel-converter-based energy storage system. A: European Conference on Power Electronics and Applications. "Proceedings of the 2011 14th European Conference on Power Electronics and Applications". Birminghan: 2011, p. 3360-3368.