Continuous 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,

Stephen S. Yau, Fellow, IEEE, and Zhaoji Chen Arizona State University, Tempe, AZ 85287-8809 {yau, zhaoji.chen@asu.edu}

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

Giritharan Ravichandran is with the E.G.S. Pillay Engineering College, Nagapattinam, TN 611001 India (corresponding author to provide phone: +91 9715589763; e-mail: rvenkkatprabu@gmail.com).

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].

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.

The potential to create exceptional, innovative products through the use of electrical engineering and embedded systems have always fascinated me. From the miniaturized circuit boards in smartphones and tablet PCs to the large-scale embedded electronics used in aerospace systems (Bozzano, Cimatti, Katoen, et. al., 2011) electrical engineering has long fascinated me. One of the most significant factors that led to my passion for this subject is the revolution that is occurring in the areas of mobile processors, avionics and aerospace systems, where embedded systems are critical to the navigational integrity of the vehicle. This revolution in embedded systems is also leading to an entirely new era of performance in avionics and deep space exploration, which promises to deliver insights never learned before from previous technologies (Kadayif, Kandemir, 2005). Due to all of these factors I am extremely interested in electrical engineering and pursing it a graduate degree in this academic discipline .

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

2 1 University of Wuerzburg, Wuerzburg Germany. DEKA Research and Development, Manchester USA. 3 Vienna University of Technology, Vienna Austria 4 University of Central Punjab, Lahore Pakistan.

I undersigned ………………………a student of T.Y.B.B.A., here by declare that the project work presented in this report is my own work and has been carried out under the supervision of prof. Kuldeep Jobanputra of R.P.Bhalodia College, Rajkot. This work has not been previously report submitted to any other university for any other examination.