Conventional Three Level Discontinuous Pulse Width Modulation Index With Variable Power Factor

The authors are S. H. Abo El-Nor, H. M. Khattab,  S. M. Khalif, H. M. El-Sayed, O.H.

AUTHOR: Cheng, C., Lin, C., Chou, P., Tsai, C., Lan, T., & Nestadt, G. (2014)

Fig. 12 shows the switching loss reduction using the DPWM2O, DPWMLPF2 and GDPWMO sequences in comparison to the conventional SVPWM strategy for 30°-60° power factor angle range. It can be seen that the DPWM2O and DPWMLPF2 sequences provide maximum switching loss reduction only at 30° and 60°, respectively. In other power factors, their loss reduction capability reduces. On the other hand, the GDPWMO strategy reduces switching losses around 50% over the entire range of power factor angle, similar to the analytical results shown in Fig.

Patel, V., Belkin, G. S., Chockalingam, A., Cooper, J., Saxena, S., & Unutzer, J. (2013, MAY,

This case was jointly prepared by Prof. Bingsheng, CKGSB YANG CKGSB Center. and Guchuan, Case TENG

Dept. of CSE, Dept. of CSE, YCCE, G.H.Raisoni College of Engg. G.H.Raisoni College of Engg. Engg Nagpur,India Nagpur,India

This project was performed as part of my Master of Electronics and Computer Engineering/Master of Electronics and Energy Engineering dissertation from Griffith University, School of Engineering, Australia. For this project I worked under the direct supervision of Prof. David Thiel, who was a source of immense help and motivation through the course of this entire project. In my project I also encountered problems with surface modelling in which I sought invaluable assistance from Dr. Hugo Espinosa.

By Allen B. MacKenzie, Senior Member IEEE , Jeffrey H. Reed, Fellow IEEE , Peter Athanas, Senior Member IEEE , Charles W. Bostian, Fellow IEEE , R. Michael Buehrer, Senior Member IEEE , Luiz A. DaSilva, Senior Member IEEE , Steven W. Ellingson, Senior Member IEEE , Y. Thomas Hou, Senior Member IEEE , Michael Hsiao, Senior Member IEEE , Jung-Min Park, Member IEEE , Cameron Patterson, Senior Member IEEE , Sanjay Raman, Senior Member IEEE , and Claudio R. C. M. da Silva, Member IEEE

Previously reported three-level DPWM schemes concluded that at a lower power factor, the three-level DPWM schemes cannot perfectly align the 60° no-switching durations [4, 17] with phase-current peaks, incurring switching instances around current maxima. Thus, their impact on the switching loss reduction is limited during low power factor operation. - Unequal current stress distribution: With conventional three-level modulation strategies, the inner and outer devices are not utilized in a uniform manner [3, 14]. At lower modulation indices, the inner devices carry a substantially higher amount of current compared to the outer devices. This effectively limits the output current capability of the drive when needed most, typically during starting from standstill and during acceleration/deceleration [21].

I would like to thank my ENSC 105 professor Martin Behr for his continued guidance in completing this paper and heloping me improve it. I would also like to thank my ENSC 105 group for their help in improving and reviewing this paper. Finally I would like to thank Abdul Ahad Memon for proof reading my paper.

This thesis deals with the design and analysis of control system structures for electric drives equipped with permanent magnet synchronous machines (PMSM) in automotive application.With the increasing popularity of multi-level inverters, the room for improvement of the performance of voltage source inverters has continuously been tested for various applications. The rapid development of high switching frequency power electronics in the past decade leads towards wider application of voltage source inverters in AC power generation. Therefore, this prompts the need for a modulation technique with less total harmonic distortion, fewer switching losses, and wider linear modulation range.The present thesis highlights the comparison of the conventional two-level inverter and the three-level diode clamped inverters for the application in automotive industry.

By Tribuvan Kumar Prakash Bachelor of Engineering in Electronics and Communication Engineering Visveswaraiah Technological University, Karnataka, 2004. August 2007

Mr. Ravinder Choudhary University Institute of Engineering and Technology Kurukshetra University Kurukshetra, India E-mail- erravindera@gmail.com

12 N.C. Sharma, D. K. Pandya, H. K. Seghal and K. L. Chopra, Mater. Res. Bull., 11 (1976) 1109.

Abstract—This paper proposes direct torque control of induction motor simulation using conventional method and space vector pulse width modulation technique for ripple reduction. Direct Torque Control is a control technique used in AC drive systems to obtain high performance torque control and thereby controlling the speed of induction motor. The principle is based on simultaneous decoupling of stator flux and electromagnetic torque of AC drive system. DTC drives use hysteresis comparators and they suffer from high torque ripple and variable switching frequency problem. The proposed SVM based DTC reduces torque ripples. The basis of the SVM-DTC methodology is the calculation of the required voltage space vector to compensate the flux and torque errors and its generation using the SVM at each sample period. The performance of this method is demonstrated by simulation using MATLAB/Simulink software. Simulation results presented in this paper show the torque, flux linkage and stator current ripple decreases with the proposed SVM-DTC algorithm.