DocumentCode :
3098835
Title :
An Alternative Approach on Three-Dimensional Space-Vector Modulation of Three-Phase Inverters
Author :
Rodriguez, Paul ; Pou, J. ; Pindado, R. ; Montanya, J. ; Burgos, R. ; Boroyevich, D.
Author_Institution :
Dept. of Electr. & Electron. Eng., Tech. Univ. of Catalonia, Terrassa
fYear :
2005
fDate :
16-16 June 2005
Firstpage :
822
Lastpage :
828
Abstract :
This paper presents a new standpoint on the analysis of the space-vector modulation (SVM) in three-phase inverters. By means of a three-dimensional (3D) approach, a mathematically and physically sound explanation of the modulation process is obtained. As it is well known, a three-phase two-level voltage source inverter has eight switching states, which give rise to eight generating vectors (two of them are the zero-vectors). Taking into account that the reference voltage vector is synthesized by these generating vectors, it seems interesting to translate the reference vector from the natural a-b-c reference base to a new one, which is directly based on the generating vectors (generating base). In this new base, one of the three unitary vectors always follows the direction of the zero-vectors (zero-sequence axis). Moreover, in a three-leg full-bridge (TLFB) inverter, the voltage synthesized over the zero-sequence axis does not appear in the load side. Therefore, it is logical to cancel the contribution of the zero-vectors on the inverter output in order to obtain the maximum use of the dc-link voltage. This cancellation is really easy when the reference vector is expressed on the new generating base, since it is only necessary to eliminate the zero-vectors direction component. As a result of this analysis, a very efficient three-dimensional space-vector modulation (3D-SVM) algorithm is introduced. In this algorithm, the modulator input variables are given in the natural a-b-c reference frame. The proposed modulation method rests on the well-known carried-based modulation technique, and avoids trigonometric calculations, definition of optimal sequences, and control of the switching intervals. The proposed 3D-SVM technique is verified by simulation and experiment
Keywords :
bridge circuits; invertors; modulation; SVM; carried-based modulation technique; dc-link voltage; natural a-b-c reference frame; reference voltage vector; three-dimensional space-vector modulation; three-leg full-bridge inverter; three-phase two-level voltage source inverter; zero-sequence axis; zero-vectors direction component; Algorithm design and analysis; Input variables; Motor drives; Optimal control; Pulse width modulation; Pulse width modulation inverters; Support vector machines; Switches; Voltage control; Zero voltage switching;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Power Electronics Specialists Conference, 2005. PESC '05. IEEE 36th
Conference_Location :
Recife
Print_ISBN :
0-7803-9033-4
Type :
conf
DOI :
10.1109/PESC.2005.1581722
Filename :
1581722
Link To Document :
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