Five level inverter desing and application with space vector pulse width modilation

SUMMARY PhD Thesis FIVE LEVEL INVERTER DESIGN AND APPLICATION WITH SPACE VECTOR PULSE WIDTH MODULATION Servet TUNCER Fırat University Graduate School of Natural and Applied Sciences Department of Electrical and Electronics Engineering 2004, Page: 95 In this thesis, the multilevel inverters and their control techniques are examined and a new algorithm for the application of space vector pulse width modulation (SVPWM) technique is proposed. In the proposed SVPWM technique, a coordinate transformation matrix is used for the determination of triangle into which the end point of the reference vector falls. Simple equations are used for the dwell times of the nearest three vectors which are defined by the determined triangle corners. Minimum switching sequence was provided by using min-max technique for the selection of inverter switching states. Thus, the SVPWM algorithm became simple, fast, easy to implement and efficient for all values of the linear modulation index. To test the validity, the proposed SVPWM algorithm was simulated using Matlab/simulink. The simulation results were compared with the experimental results. For this aim, a 5-level cascade inverter was designed and variable amplitude and frequency three-phase output voltage of this inverter is applied to an AC motor. Keywords: Multilevel inverter, pulse width modulation techniques, space vector, selected harmonic elimination, 5-level cascade inverter. XII