DocumentCode :
781499
Title :
Voltage Balancing Control of Diode-Clamped Multilevel Converters With Passive Front-Ends
Author :
Busquets-Monge, Sergio ; Alepuz, Salvador ; Bordonau, Josep ; Peracaula, Juan
Author_Institution :
Dept. of Electron. Eng., Tech. Univ. of Catalonia, Barcelona
Volume :
23
Issue :
4
fYear :
2008
fDate :
7/1/2008 12:00:00 AM
Firstpage :
1751
Lastpage :
1758
Abstract :
In the previous literature, it has been reported that it is not possible to guarantee the balance of the DC-link capacitor voltages of multilevel three-phase diode-clamped DC-AC converters with passive front-ends for high modulation indices, especially for more than three levels. This paper proposes a novel closed-loop control approach capable of guaranteeing such balance for all operating conditions of the converters without the need for additional hardware. Three different phase duty-ratio perturbation schemes are proposed. They are compared through simulation for the case of a four-level three-phase diode-clamped DC-AC converter operated with a virtual-vector-based modulation. The most simple and effective perturbation scheme, only requiring the sensing of all DC-link capacitor voltages, is tested experimentally in the same four-level converter. The results demonstrate the feasibility of guaranteeing the dc-link capacitor voltage balance for all converter operating conditions.
Keywords :
DC-AC power convertors; capacitors; closed loop systems; voltage control; DC-AC converter; DC-link capacitor voltage; closed-loop control; diode-clamped multilevel converter; passive front-end; virtual-vector-based modulation; voltage balancing control; Capacitors; Hardware; Impedance; Pulse width modulation; Pulse width modulation converters; Semiconductor diodes; Space vector pulse width modulation; Testing; Topology; Voltage control; Capacitor voltage balance; diode-clamped; multilevel; pulsewidth modulation (PWM); virtual vector;
fLanguage :
English
Journal_Title :
Power Electronics, IEEE Transactions on
Publisher :
ieee
ISSN :
0885-8993
Type :
jour
DOI :
10.1109/TPEL.2008.925182
Filename :
4558218
Link To Document :
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