IEEE Power Electronics Society (PELS), Malaysia Chapter would like to cordially invite you to the National Lecture Program (NLP) on Power Electronics as follows:
Date : 20 October 2016 (Thursday)
Time : 9am – 12.15pm
Venue : Lecture Theatre 2 (Room No: 1019), University of Southampton Malaysia Campus, No. 3, Persiaran Canselor 1, Kota Ilmu, Educity @ Iskandar 79200, Iskandar Puteri (Nusajaya), Johor Malaysia
Talk 1: Direct Torque Control of Induction Motor: Problems and Improvements
Presenter: Assoc. Prof. Dr. Nik Rumzi Nik Idris (UTM)
Talk 2: Does Variable Speed Drive in Three Phase Induction Motor System Really Save Energy?
Presenter: Assoc. Prof. Ir. Dr. Gobbi Ramasamy (MMU)
Talk 3: Multi-Input DC-AC Inverter for Low Voltage Hybrid PV/Wind/Hydrogen Fuel Cell
Presenter: Dr. Nor Zaihar Yahaya (UTP)
Direct Torque Control of Induction Motor: Problems and Improvements
Direct torque control (DTC) of induction motor (IM) has gained popularity in industrial
applications mainly due to its simplicity and excellent torque performance. In its basic form, DTC of IM is inherently a speed-sensorless drive system. DTC of IM can also be considered as an alternative solution in high performance control applications, capable of replacing the famous field-oriented control techniques. However, DTC as originally proposed by Isao Takahashi, has its own drawbacks, such as high torque ripples, variable switching frequency, and flux regulation problems. This talk will discuss on these problems and their root causes. Some techniques which have been implemented in UTM-PROTON Future Drive Laboratory to overcome some of these problem will be presented.
Nik Rumzi Nik Idris, Ph.D.
Associate Professor, Universiti Teknologi Malaysia, Malaysia
Head, Power Electronics and Drives Research Group (PEDG), UTM
Nik Rumzi Nik Idris received the B.Eng. degree in electrical engineering from the University of Wollongong, Australia, the M.Sc. degree in power electronics from Bradford University, West Yorkshire, U.K., and the Ph.D. degree from Universiti Teknologi Malaysia (UTM) in 1989, 1993, and 2000, respectively. Currently, he is an Associate Professor and the head of the Power Electronics and Drives Research Group (PEDG) at Universiti Teknologi Malaysia. He is also the head of UTM-PROTON Future Drives Laboratory, UTM. He is a senior member of Institute of Electrical and Electronics Engineers (IEEE) and also the chair of the IEEE Power Electronics Society, Malaysia Chapter. He has authored and co-authored over 100 papers in various technical journals and conference proceedings related to power electronics and drives. His research interests include control of ac drive systems and DSP applications in power electronic systems.
Does Variable Speed Drive in Three Phase Induction Motor System Really Save Energy?
In Malaysia, 85% of the three phase induction motors are IE1 motors. Despite various awareness workshops and seminars concerning high efficient motors (IE2 and IE3) are organized for the past one decade, their acceptance in the industry is still very low, mainly due to the initial cost for the new high efficient motors. There is also move to encourage the use of variable speed drives for three phase motors to reduce electric energy consumptions. Surprisingly, engineers in the industry preferred the installation of inverters rather than replacing the existing motors with high efficient motors. The question is, can we install variable speed drives in all the existing motor applications
for energy savings? In this talk, issues that need to be considered for the selection of three phase induction motors, motor starters and variables speed drives will be discussed. Several case studies based on the actual installation and retrofit projects will be discussed as well.
Gobbi Ramasamy, P.Eng., Ph.D.
Associate Professor, Multimedia University, Malaysia
R. Gobbi received the Bachelor degree in electrical engineering from University of Technology, Malaysia, and the Master degree in technology management from the National University of Malaysia, and the Ph.D. degree in the area of torque control of switched reluctance motors from Multimedia University, Malaysia. He has been associated with technical education for more than fifteen years. He was an electrician and R&D Engineer before become a Lecturer in electrical and electronics engineering. He has supervised many research projects on power electronics, variablespeed drives, automation, and domestic electrical installations. He is a project leader and member
of various government research projects related to electric motors and drives system. He is a consultant providing solutions for many problems associated to electric motors and drives system for various industries. He has published more than 60 technical papers in international journals and conferences. He is an associate professor in faculty of Engineering, Multimedia University, Malaysia. His research interests are in reliability of electric motors, power electronics applications in energy industries, switched reluctance motor drives system and solar power application. Dr. Gobbi is a corporate member of the Institution of Engineers Malaysia, a professional engineer registered to Board of Engineers, Malaysia, Electric Energy Manager Registered to Energy Commission, Malaysia, and a Senior Member of Institute of Electrical and Electronics Engineers,
Multi-Input DC-AC Inverter for Low Voltage Hybrid PV/Wind/Hydrogen
Fuel Cell Power System
This work looks into multi-input renewable energy sources for DC-AC inverter (MII) design. The proposed MII consists of a DC-DC boost converter and a single phase full bridge DC-AC inverter. The structure of MII is simpler compared to several single-input inverters used for each source. The input sources applied in this work comprise of photovoltaic (PV), wind turbine (WT) and hydrogen fuel cell (HFC). As the power from PV and WT are intermittent, a charge controller is required to provide uninterrupted supply to the MII. This MII is capable to operate in three different operating modes and power delivered to the load can be either individually or simultaneously. The proposed inverter was simulated using NI Multisim 12.0 circuit simulator and the results are discussed in details.
Nor Zaihar Yahaya, Ph.D.
Senior Lecturer, Universiti Teknologi PETRONAS, Malaysia
Nor Zaihar Yahaya was born in Lumut, Malaysia. He went to the University of Missouri-Kansas City, USA to study electronics. He graduated with a BSc in Electrical Engineering in 1996. After that he served 5 years in the industry in Malaysia. In 2002, he was awarded MSc in Microelectronics from the University of Newcastle Upon Tyne, UK. In 2011, he received PhD from the Universiti Teknologi PETRONAS, Malaysia. His main teaching/research areas are the study of Solid State Physics, Microelectronics & Devices and Power Electronics & Drives. He has published more than 70 papers in proceedings, journals and book chapter with several Patent and Copyright. Currently, he is actively working on projects related to Power Electronics / Renewable Energy and for Oil & Gas / PETRONAS interest.