DocumentCode :
1533063
Title :
Asymmetrical Multilevel Inverter for Traction Drives Using Only One DC Supply
Author :
Dixon, Juan ; Pereda, Javier ; Castillo, Carlos ; Bosch, Sebastián
Author_Institution :
Dept. of Electr. Eng., Pontificia Univ. Catolica de Chile, Santiago, Chile
Volume :
59
Issue :
8
fYear :
2010
Firstpage :
3736
Lastpage :
3743
Abstract :
The main advantage of asymmetrical multilevel inverters is the optimization of levels with a minimum number of power supplies. However, this optimized multilevel system still needs a large number of isolated and floating dc supplies, which makes these converters complicated to implement in electric vehicles (EVs), because the system will require many independent battery packs. In this paper, a very simple scheme, based on a small and cheap high-frequency link (HFL), allows the utilization of only one power supply for the complete multilevel inverter drive, with an inherent regulation of the voltages supplied among the H-bridges. It also allows voltage control with the full number of levels if the dc source is of a variable voltage characteristic. This paper is focused on a 27-level asymmetric inverter, but the strategy, using only one power supply, can be applied to converters with any number of levels. In particular, an asymmetrical 27-level converter needs nine isolated power supplies, and the proposed system reduces these nine sources to only one: the battery car. The topology also permits full regenerative braking working as a three-level converter. The proposed system is intended for application in EVs from power ratings up to 150 kW. Simulations and experimental results show the feasibility to implement this “one-source” multilevel system.
Keywords :
AC motor drives; hybrid electric vehicles; invertors; DC supply; asymmetrical multilevel inverter; electric vehicles; high-frequency link; power supplies; traction drives; Batteries; Bridge circuits; Frequency; Hybrid electric vehicles; Inverters; Multilevel systems; Power supplies; Topology; Transformers; Voltage; AC motor drives; electric vehicles (EVs); hybrid EVs (HEVs); multilevel converters; power conversion;
fLanguage :
English
Journal_Title :
Vehicular Technology, IEEE Transactions on
Publisher :
ieee
ISSN :
0018-9545
Type :
jour
DOI :
10.1109/TVT.2010.2057268
Filename :
5508323
Link To Document :
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