Title :
The circuit-level decoupling modulation strategy for three-level neutral-point-clamped (TL-NPC) inverter
Author :
Zhe Zhang ; Thomsen, Ole C. ; Andersen, Michael A. E.
Author_Institution :
Tech. Univ. of Denmark, Lyngby, Denmark
fDate :
Aug. 30 2011-Sept. 1 2011
Abstract :
In this paper, a circuit-level decoupling modulation strategy is proposed for the three-level (TL) neutral-point-clamped (NPC) inverters. With the proposed modulation scheme, the TL-NPC inverter can be decoupled into two three-level Buck converters in each defined operating section, which makes the controller design much simpler. The decoupling principle including the driving signal synthesis and the neutral point potential variation are analyzed detailed. It is found that switching losses can be reduced by one third and the voltage balance between the dividing dc link capacitors can be achieved without any feedback control. The simulation results show the validity of theoretical analysis.
Keywords :
control system synthesis; feedback; invertors; DC link capacitors; TL-NPC Inverter; buck converters; circuit-level decoupling modulation strategy; controller design; driving signal synthesis; feedback control; switching loss; three-level neutral-point-clamped inverter; Capacitors; Electric potential; Equivalent circuits; Inverters; Modulation; Switches; Voltage control; Modulation strategy; Multilevel converters; Voltage Source Inverters (VSI);
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
