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Voltage Balancing in SVM Controlled Diode Clamped Multilevel Inverter for Adjustable drives

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Author(s): P. S. Anish | S. Ramarajan | T. Arun Srinivas | M. Sasikumar

Journal: International Journal of Soft Computing & Engineering
ISSN 2231-2307

Volume: 2;
Issue: 1;
Start page: 93;
Date: 2012;
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Keywords: Medium-voltage drives | multilevel inverters | Space vector modulation | voltage balancing.

ABSTRACT
The work describes a transformer less mediumvoltage adjustable-speed induction motor drive consisting oftwo back-to-back connected five-level diode-clampedconverters. Due to the feedback from the load to the dc linknodes, there is a chance of voltage imbalance. In this paper themethods for voltage balancing are discussed and simulated. Theusage of switching techniques to employ voltage balancingrather than the external circuitry is being discussed. Properswitching results in the control of average current through thenodes and hence the non symmetrical charging and dischargingof the dc split capacitors can be avoided. The first phase of workexplains the output using the multicarrier pulse widthmodulation technique and the second phase deals with themodification done using the Space vector Pulse WidthModulation (SVPWM) technique. Voltage balancing is achievedwith lesser harmonic content while using the SVPWMtechnique.
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