Title :
Capacitor voltage balance limits in a multilevel-converter-based energy storage system
Author :
Burusteta, S. ; Pou, Josep ; Ceballos, Salvador ; Marino, I. ; Alzola, J.A.
Author_Institution :
Tecnalia Res. & Innovation, Derio, Spain
fDate :
Aug. 30 2011-Sept. 1 2011
Abstract :
This paper studies an energy storage system based on a three-level DC-DC converter and a grid-connected 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.
Keywords :
DC-DC power convertors; energy storage; invertors; oscillations; power capacitors; power grids; DC-link capacitor; energy storage system; grid-connected neutral-point-clamped inverter; modulation algorithm; multilevel power conversion system; neutral-point voltage balance control; neutral-point voltage oscillation; three-level DC-DC converter; Energy storage; Inductance; Inverters; Modulation; Oscillators; Switches; Voltage control; Converter control; Energy storage; Modulation strategy; Multilevel converters; Renewable energy systems;
Conference_Titel :
Power Electronics and Applications (EPE 2011), Proceedings of the 2011-14th European Conference on
Conference_Location :
Birmingham
Print_ISBN :
978-1-61284-167-0
Electronic_ISBN :
978-90-75815-15-3