TY - GEN
T1 - A space vector modulation approach for a back-to-back connected four-level converter
AU - Saeedifard, M.
AU - Iravani, R.
AU - Pou, J.
PY - 2007
Y1 - 2007
N2 - The phenomenon of DC-capacitor voltages drift is the main technical challenge of a back-to-back connected Diode-Clamped Multi-level Converter (DCMC). This paper (i) develops a mathematical model for a back-to-back connected four-level DCMC and formulates the capacitor voltages drift phenomenon, and (ii) based on the developed model proposes a Space Vector Modulation (SVM) approach to control the capacitor voltages drift. The online voltage balancing task is achieved based on a coordination between the two SVM modulators that minimize a cost function related to voltage unbalance of DC-capacitors. The main feature of the proposed SVM-based balancing strategy is that it enables online DC-capacitor voltages balancing with no requirement for lookup tables, additional controls or auxiliary devices. Performance of the overall back-to-back DCMC system and effectiveness of the proposed SVM-based balancing strategy are evaluated based on time-domain simulations in the PSCAD/EMTDC software environment.
AB - The phenomenon of DC-capacitor voltages drift is the main technical challenge of a back-to-back connected Diode-Clamped Multi-level Converter (DCMC). This paper (i) develops a mathematical model for a back-to-back connected four-level DCMC and formulates the capacitor voltages drift phenomenon, and (ii) based on the developed model proposes a Space Vector Modulation (SVM) approach to control the capacitor voltages drift. The online voltage balancing task is achieved based on a coordination between the two SVM modulators that minimize a cost function related to voltage unbalance of DC-capacitors. The main feature of the proposed SVM-based balancing strategy is that it enables online DC-capacitor voltages balancing with no requirement for lookup tables, additional controls or auxiliary devices. Performance of the overall back-to-back DCMC system and effectiveness of the proposed SVM-based balancing strategy are evaluated based on time-domain simulations in the PSCAD/EMTDC software environment.
UR - http://www.scopus.com/inward/record.url?scp=48349085389&partnerID=8YFLogxK
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U2 - 10.1109/PESC.2007.4342320
DO - 10.1109/PESC.2007.4342320
M3 - Conference contribution
AN - SCOPUS:48349085389
SN - 1424406552
SN - 9781424406555
T3 - PESC Record - IEEE Annual Power Electronics Specialists Conference
SP - 2043
EP - 2049
BT - PESC 07 - IEEE 38th Annual Power Electronics Specialists Conference
PB - Institute of Electrical and Electronics Engineers Inc.
T2 - PESC 07 - IEEE 38th Annual Power Electronics Specialists Conference
Y2 - 17 June 2007 through 21 June 2007
ER -