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PERSONAL
Date of Birth: 1969
Place of Birth: Tehran, Iran
Phone: (+98) 911 512 6561
EDUCATION:
Ph.D.
(1995- 2000), Electrical Engineering,
Ferdowsi University of Mashhad, Mashhad, Iran, Outstanding Degree
(Excellent Graduate). Advisors:
Dr.
Reza Ghazi, Dept. of Electrical Eng., Ferdowsi University of
Mashhad, Mashhad, Iran
Dr. Hamid A. Toliyat, Dept. of Electrical
Eng., Texas A&M University , Texas, USA.
M.Sc. (1992-1995), Electrical
Engineering, Ferdowsi University of Mashhad, Mashhad, Iran, 1995, (Excellent
Graduate)
B.Sc (1987-1991) , Electrical
Engineering (Electronics), Sistan & Baluchestan University, Zahedan, Iran,
1991, (Excellent Graduate)
RESEARCH INTERESTS:
· Control
Systems: H_inf Robust
Control, Chaotic Systems, Intelligent Systems, Fuzzy Logic based Control,
Neural Networks.
· Modeling
& Control Techniques of Power Electronic Systems
· Power
Electronics: All Areas
including Converter Circuits and Topologies, PWM Strategies, Modeling and
Control of Power Converters, Applications to Power Systems.
· Power
Quality, Harmonics, and Active Power Filters
· Computer
Science and Engineering
PRIZES & HONORS:
· Author
of one of the outstanding papers recognized in the ICEE-95, Iran.
LECTURES AND SHORT COURSES
A. Electrical Engineering (Undergraduate Level):
· Modern Control
Systems (State Space Modeling, Linearization, Controllability,
Observability, Realization Theory, Stability, State Feedback, Optimal
Observers, Optimal Control) .
· Linear Control Systems ( Time
& Frequency Domain Analysis and Design of Control Systems, State Space) .
· Instrumentation ( Measurement
of : Position, Stress , Strain , Pressure , Height , Heat, Velocity.
Optical Sensors, Microwave
Sensors, Radioactive Sensors, ...) .
· Industrial
Electronics
· Engineering Statistics
· Engineering Mathematics
· Applied Electronics
· Electric Measurements
· Electronics Basis
· Control Basis
· Communication Basis
· Electronics ( Analogue , Digital
,and Industrial)
B. Computer Science & Eng. (Undergraduate
Level, Azad University, Birjand, Iran):
· Data Base (EER and NIAM Models, Relational Data
Bases, Relational Algebra, SQL)
· File Systems and Structures (
Records, Blocking Techniques, Disk and Tape Analysis. File Structure:
Pile, Sequential, Indexed Sequential, Multi Indexed, Direct Files,...)
· Operating Systems( OS Layers,
Process Management, Storage Management, Virtual Storage, Paging and
Segmentation, Resource Management, Dead Locks,...)
· Computer Aided Design (AutoCAD,
Matlab and their applications )
· Data Structure ( Data Structures
and Their Applications : Lists, Arrays, Queues, Stacks, Binary Trees .
Algorithms and Their Complexity : Quick Sort, Bubble Sort, Heap
Sort, Binary Search, ....Data Structure with C )
· Special Topics in Computer Science
( Matlab and Scientific Languages)
· Computer Networks(
OSI and TCP/IP Models, Physical Layer: Pulse encoding/Decoding ,Shannon and
Nyquist Theorems, TP,UTP, Coaxial, Fiber Optics, Microwave and Satellite
Systems. Data Link Layer: Farming Techniques, Flow Control, Data Link Layer
Protocols, Sliding Window Protocols, HDLC Protocol. Error Encoding/Decoding,
CRC and Hamming Codes. Network Layer: Circuit Switching, Virtual Circuit
Switching, Packet Switching, Routing Algorithms, Traffic Control, ...)
C. Graduate Level (Khorasan Higher
Education Institute, Ministry of Energy, Iran):
· Mathematics & Statistics
· Advanced Engineering Mathematics
(Advanced Linear Algebra, Nonlinear and Time Varying Differential
Equations, Advanced Fourier Transform,
Optimization Techniques)
· Power Electronics ( Power
Devices, Analysis and Design of AC/DC, DC/AC,DC/DC, and AC/AC Converters, PWM
Techniques ,Applications to Power Systems,.. .)
· Special Loads ( Harmonics, Voltage Stability, Power
Definitions in Non Sinusoidal Conditions, Arc Furnaces, Induction Heating,
Power Converters, Transient Response of Electric Machines, Constant Power
/Energy/Current Loads, Harmonics and Reactive Power Compensation,
SVCs, Active Power Filters, Thyristor Switched Capacitors)
D. Short Courses (In Industries):
·
Neka Power Station, Iran, 1998, presented a short course on Power Electronics
(51 hours) for Electrical Engineers.
·
Sistan & Baluchestan Regional Power Company, Iran, 1998, presented a short
course on Power Electronics (51 hours) for Electrical Engineers.
·
Sistan & Baluchestan Regional Power Company, Iran, 1998, presented a short
course on Design of Distribution Systems(20 hours) for Electrical Engineers.
·
Sistan & Baluchestan Regional Power Company, Iran, 1997, presented a short
course on Safety against Electric Shock (18 hours) for Electrical Engineers.
·
Sistan & Baluchestan Regional Power Company, Iran, 1998, presented a short
course on Safety against Electric Shock (18 hours) for Electrical Engineers.
·
Toos Power Station, Iran, 1998, presented a short course on Voltage Control and
Reactive Power Compensation (51 hours).
·
Toos Power Station, Iran, 1997, presented a short course on Electronic
Components of Control Systems (34 hours).
· Khorasan Regional Power
Company, Iran, 1998, presented a short course on Special Loads (15 hours) for
Electrical Engineers.
E. Lab Supervising /Founding:
·
Industrial Electronics Lab.
·
Electronics Lab.
·
Control Systems Lab.
F. Teaching
Assistantship (1989-1992)
· Electronics
1( Fundamental of Electronic Circuits and Devices)
· Electronics
2 ( FETs, Feedback Amplifiers, Power Amplifiers, OP Amps and their
Applications, Low Frequency Response of Amplifiers, Voltage Regulators)
·
Electronics 3 (High Frequency Electronics : PI Model of Transistor,
High Frequency Response of Wideband Amplifiers , Compensation Techniques)
· Communication
Circuits ( Oscillators, Narrowband Amplifier Systems, Modulators,
Demodulators, Noise Analysis, PLLs, Matching Circuits, ...)
· Communication
Systems 1
· Electric
Circuits 1
· Computer Elements Lab.
RESEARCH WORKS & PROJECTS:
BOOKS:
1.Translation: “ Feedback Control Theory “ (Under
Translation).
JOURNAL
PAPERS:
CONFERENCE
PAPERS (Power Electronics/Control Systems/Power Quality):
Comment:
1.
ICEE is a creditable annual conference on Electrical Engineering at Iran that
is supported by IEEE, IEE, all the Iranian Universities and Research Centers
and Industrial ministries.
SERVICES:
· Reviewer for the IEEE Transactions on Power Delivery
· Reviewer for the IEEE Transactions on Energy Conversion
·Member of Selection Committee, Faculty of Electrical
Engineering, Sahand University of Technology.
· Member of Informatics Board, Sahand
University of Technology.
· Reviewer
for the Iranian Journal of Science & Technology (ijst) , Shiraz University,
Shiraz, Iran , ISSN 0363 - 1307.
· Reviewer
for the Journal of Engineering Faculty of Ferdowsi University of Mashhad, Mashhad,
Iran
· Reviewer for the 14-th International
Conference on Power Systems (PSC-99), Iran Energy Research Center, Tehran,
Iran, 1999.
· Reviewer
for the 10-th Iranian Conference on Electrical Engineering (ICEE-2002), Tabriz, Iran.
· Member of IEEE- Iran branch.
· Assistant Professor , Department of
Computer & Electrical Eng., Azad University of Birjand, Birjand, Iran
(Sept. 2000-Feb. 2001).
· Lecturer, Department of Computer &
Electrical Eng. Azad University of Birjand, Birjand, Iran (Jan 1998- Sept
2000).
SOFTWARE & PROGRAMMING SKILLS
· C
· ASSEMBLY
· BASIC
· FORTRAN
· SQL
· MATLAB/
SIMULINK
· AUTO
CAD
Title
of Ph.D. Dissertation:
Optimal and Flexible Strategy
for Adaptive Control of Active Filters Under Non-Sinusoidal Line Voltages
Abstract :
This
Dissertation gives a new insight into the concept of load compensation under
distorted voltages. Achieving both unity power factor (UPF) and perfect
compensation of current harmonics are not possible where a competition will
arise between these two important factors. Through evaluating the
present control strategies, a generalized, optimal, and flexible
control strategy (OFC) for
harmonic compensation of utility lines is proposed. The proposed control
strategy, which provides a unified and highly flexible compensation framework
has the ability of programming for perfect current harmonics compensation, or
(UPF) accomplishment, or other newly defined objectives such as maximizing the
power-factor subject to some adjustable constraints on the level of current
harmonics and unbalancing via an on-line optimization algorithm. The
strategy can fulfill the IEEE-519 standards requirements, while guaranteeing
the best achievable power factor and optimum required rating for the
compensator. A fast and simple version of OFC strategy has
been successfully proposed and realized using neural networks. The
optimization algorithm is replaced by a neural network based
system that is learned off-line and has the real time realization
capability. Theoretical concepts and practical features of the proposed control
strategies have been shown through extensive simulation studies using
MATLAB/SIMULINK programs.
Key Words: Distorted voltage,
harmonics, power factor, active filter, flexible compensation
strategy, optimization, real time control, neural networks.
Advisors:
1. Dr.
Reza Ghazi, Dept. of Electrical Eng., Ferdowsi University of
Mashhad, Mashhad,Iran
2. Dr. Hamid A. Toliyat, Dept. of Electrical
Eng., Texas A&M University , Texas,USA.
Title
of Master of Science Thesis :
Supervisors:
1.
Dr. Hamid A. Toliyat, Dept. of Electrical Eng., Texas A&M University
, Texas, USA.
2. Dr. Reza Ghazi, Dept. of Electrical Eng., Ferdowsi University of Mashhad,
Mashhad, Iran
Abstract :
Nonlinear
Loads produce non-sinusoidal currents in the power system. Theses harmonics
cause many difficulties such as reducing the power factor and interference on
communication and control systems. Many efforts have been performed to reject
these unfavorable current components and the modern compensation strategies are
based on using the active filters. The two main parts of an active filter are:
-
Harmonic Detector System.
-
Inverter Based Compensator System.
Detector system separates
unfavorable part of the load current, harmonics and/or reactive current and
then this current is compensated by the compensator system. Usually, the
compensator system is a Current Regulated PWM Inverter, which has the ability
of reproducing the detected currents. This inverter injects the identified
current to the power network in anti-phase direction and thereby clears the
source current from the harmonics and other undesired currents. From both the
theoretical and practical views each system has been of interesting research
topics in the past three decades.
This
thesis is a comprehensive research on the “ Active Filtering”. Enough attention
has been paid on introducing the essential concepts, reviewing the previously
published methods, and investigating the advantages and weaknesses of each. In
the detection field, evaluating the present method such as p-q theory based method which is state
of the art, a new method based on the p-q theory, and by using the IIR digital
filters has been proposed and its superiority over the classical methods has
been shown by digital computer simulations.
Fuzzy Logic Based PWM
Strategies:
Presenting
the concept of Fuzzy Logic Based PWM Schemes (FPWM)is the main object of this
thesis. The proposed schemes which are on-line but optimal PWM Strategies were
successfully used for compensating the harmonics. FPWM systems can be
programmed for optimizing the performance of inverter output waveform i.e. reducing the THD or DF and switching
loss of inverter.
Several new Fuzzy Logic Based
PWM systems such as Centroid Based and Equal Area Fuzzy PWM have been proposed
and their superiority over conventional PWM systems has been shown. Evaluating
criteria are Total Harmonic Distortion (THD) and Distortion Factor (DF) of the
inverter output current. Also for optimizing the Fuzzy Modulators the Genetic
Algorithms the well-known numerical optimization methods have been used. Also
the system transient response and its performance in over modulation conditions
have been analyzed.
Closed Loop Digitally
Controlled Current Regulated PWM Inverters:
Before
using the proposed Fuzzy PWMs in a practical closed loop Current Regulated PWM
(CRPWM) system for compensating the harmonics, because of digital nature of
fuzzy modulators it was necessary to perform an in depth separate research work on digital
control of CRPWM system. This research led to some new important results. The
interesting results were presented as a new theorem on sampling rate of PWM
signals in digital control of CRPWM systems where the feedback signal contains
a large amounts of high frequency ripples due to switching behavior of the
inverter .In contrast with classic sampling theorem that says the sampling
frequency should be higher than twice the signal bandwidth, further studies
about the PWM signals showed that in the case where the PWM strategy is double
edged and symmetric the sampling frequency can be reduced to be equal to the
switching frequency of the inverter. The proposed theorem was analytically
proved in the frequency domain and successfully verified by both the digital
computer simulation and experiments on a practical system in laboratory. Also
for adapting the under experiment system to the theoretical conditions some
modifications were performed in the practical system. for example, because of
Opto -Coupler and power devices delay we made to perform the delayed sampling
techniques. Experimental results successfully certified the presented theories
and the performance of the several PWM techniques such as natural sampling and
regular sampling (both single edge and double edge) were practically examined
and compared. This Theoretical & practical results clearly showed the
importance and advantages of symmetric PWM techniques.
Closed Loop Optimal Control
Of CRPWM Inverter By Fuzzy PWM Strategies:
According
to the results of previous sections, the
proposed Equal Area Fuzzy PWM, which is a symmetric PWM strategy, was
selected to be used in the closed loop CRPWM system. Optimal control of the
closed loop system has been attended. A hybrid objective function, containing a
term concerns the THD of inverter output and a term affected by the transient
and steady state response of the closed loop system has been defined. Then,
optimizing the Fuzzy PWM System was performed by using the Genetic Algorithms
and the resulting system has both the optimal signaling performance (THD) and optimal transient and steady state
characteristics.
The
Passed Courses In The Graduate Programs:
Control
Field:
Modern Control Systems : Dr. Toliyat, Senior Member,
IEEE
Optimal Control Systems : Dr. Vahidian- Kamyad
Stochastic Control Systems : Dr. Modir- Shanechi,
Senior Member, IEEE
Digital Control Systems : Dr. Asgharian
Multivariable Control Systems : Dr. Jahed-Motlagh
H_infinity Robust Control Systems : Dr. Asgharian
Non-Linear Control Systems : Dr. Modir- Shanechi,
Senior Member, IEEE
Adaptive Control Systems : Dr. Menhaj
Neural Networks : Dr. Mirsalehi, Senior Member, IEEE
Reactive Power Control in Power Systems : Dr. Ghazi
Nonlinear Dynamics of Power Systems : Dr. Modir -Shanechi, Senior Member, IEEE
Power
Field :
Power Electronics: Dr. Toliyat, Senior Member, IEEE
General Theory of Electric Machines : Dr. Toliyat,
Senior Member, IEEE
Electric Machines III (Synchronous Machines) : Dr. Toliyat, Senior
Member, IEEE
Power System Analysis I : Dr. Ghazi
Power System Analysis II :Dr. Modir- Shanechi, Senior Member, IEEE
Mathematics
Field:
Stochastic Processes : Dr. Molavi, Senior Member, IEEE
Linear and Nonlinear Programming : Dr. Taghizadeh
Real Analysis I : Dr. Niknam
Real Analysis II : Dr. Niknam
References
:
1. Dr. H.A. Toliyat, Dept of Electrical
Engineering, Texas A&M University, U.S.A.(email : [email protected])
2. Dr.
R. Ghazi, Dept of
Electrical Engineering, Ferdowsi University of Mashhad, Iran. Po.
Box 91775-1111 (email: [email protected],
Home Tel : 0098 511 7682412)
3.
Dr. Javad Mahdavi, Dept of Electrical Engineering,
Sharif University of Technology, Tehran ,Iran.(email:
[email protected])
4. Dr. Jalil Rashed -Mohassel, Dept of Electrical & Computer
Engineering, University of Tehran, Tehran, Iran.(email:
[email protected])
5. Dr. M.H. Menhaj, Dept of Electrical Engineering, Amir Kabir
University of Technology, Tehran, Iran.
.
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