Voltage Balancing in SVM Controlled Diode Clamped Multilevel Inverter for Adjustable Drives
P. S. Anish1, S. Ramarajan2, T. Arun Srinivas3, M. Sasikumar4
1P. S. Anish, P G Scholar, Jeppiar Engineering College, Anna University, Chennai, Tamilnadu, India.
2Dr. M. Sasikumar, Professor, Jeppiar Engineering College, Anna University, Tamilnadu, India.
3T. Arun Srinivas, Asst. Professor, Jeppiar Engineering College, Anna University, Tamilnadu, India.
4S. Ramarajan, P.G Scholar, Sathyabama university, Chennai, Tamilnadu, India.
Manuscript received on January 30, 2012. | Revised Manuscript received on February 06, 2012. | Manuscript published on March 05, 2012. | PP: 93-98 | Volume-2 Issue-1, March 2012. | Retrieval Number: A0386012111 /2012©BEIESP
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© The Authors. Published By: Blue Eyes Intelligence Engineering and Sciences Publication (BEIESP). This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/)
Abstract: The work describes a transformer less medium voltage adjustable-speed induction motor drive consisting of two back-to-back connected five-level diode-clamped converters. Due to the feedback from the load to the dc link nodes, there is a chance of voltage imbalance. In this paper the methods for voltage balancing are discussed and simulated. The usage of switching techniques to employ voltage balancing rather than the external circuitry is being discussed. Proper switching results in the control of average current through the nodes and hence the non symmetrical charging and discharging of the dc split capacitors can be avoided. The first phase of work explains the output using the multicarrier pulse width modulation technique and the second phase deals with the modification done using the Space vector Pulse Width Modulation (SVPWM) technique. Voltage balancing is achieved with lesser harmonic content while using the SVPWM technique.
Keywords: Medium-voltage drives, multilevel inverters, Space vector modulation, voltage balancing.