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Design of Medium Voltage Cascaded H Bridge Multilevel Inverter with Reliability Consideration

Balador, Ayoub | 2013

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 44790 (05)
  4. University: Sharif University of Technology
  5. Department: Electrical Engineering
  6. Advisor(s): Zolghadri, Mohammad Reza
  7. Abstract:
  8. Today, with the development of power electronics and the emergence of various multilevel converters, possibility of operation at the voltage and powers higher than the rated value of components is provided. The reliability of these converters due to their high power is important. In this project, design of multilevel inverter with cascaded H-bridge structure have been studied for a medium voltage and high power 3.3 KV, 1MVA application, due to its advantages over other structures. This converter is composed of several cascaded low voltage full-bridge cells. Therefore, the converter is composed of many semiconductor elements that the reliability of them depends on the physical stresses such as voltage, temperature and etc. Reliability of the power converter can be improved in several ways. The easiest way is increasing the components nominal values and the second way is the use of redundancy that in recent years, much research has been done in this field for multilevel converters. Surely these two methods will increase the price. But the third way is gathering information about the factors affecting the reliability of the components and the converter will be designed with the use of this information. In this method the design strategy is based on modeling and calculation of reliability in order to improve the reliability of the converter. The improvement will be done by reducing the number of components and stress on the various components and utilizing the best possible technology components. This project uses this method to improve the converter reliability and the optimal number of cells for cascaded full-bridge multilevel inverter will be determined. At the end the economic comparison will be done
  9. Keywords:
  10. Reliability ; Multilevel Inverter ; Loss Reduction ; Voltage Control

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