A. Davari

Universidade Estadual de Campinas (UNICAMP)

Author Statistics

Papers

Citation

H-Index

i-10 index

Research Trends

Author Order

Document Type

Co-Authors

A. Feliachi

West Virginia University

Lawrence J. Shadle

National Energy Technology Laboratory

Praveen Koduru

Kansas State University

Chaminda Chandrasekara

Sabaragamuwa University of Sri Lanka

Zhiqiang Wu

PLA Information Engineering University

Kourosh Sedghisigarchi

California State University, Northridge

Alireza Khayatian

Shiraz University

Shailaja Pulluri

West Virginia University Institute of Technology

A.R. Sakhare

West Virginia University Institute of Technology

Ranjith Munasinghe

West Virginia University Institute of Technology

Cooperative Institutions

West Virginia University Institute of Technology

West Virginia University

Morgantown High School

Isfahan University of Technology

Universidade Estadual de Campinas (UNICAMP)

Georgia Institute of Technology

Kansas State University

National Energy Technology Laboratory

United States Department of Energy

Peking University

Author Statistics

Papers

Citation

H-Index

i-10 index

Research Field

Application of discrete event systems theory for modeling and analysis of a power transmission network

IEEE PES Power Systems Conference and Exposition (2005)

Tamal Biswas A. Davari A. Feliachi

Apart from the continuous time phenomena various discrete events occur in an electric power system. Previously, the size and operation of the power systems were considerably small and centralized compared to the large, decentralized power systems of the present day. Each discrete event occurring in the power system was manually acknowledged and necessary changes were made in the system operation. But with the recent deregulation, the sizes of the power system have increased rapidly and it is becoming very difficult if not impossible to use the traditional methods. Specialized tools are necessary for modeling and analysis of the discrete events occurring in the power system. A number of formal languages, including Petri nets and finite state machines can be used for this purpose. This paper describes how discrete event systems theory can be applied for modeling and analysis of a power transmission network.

Discrete-Event Simulation

10.1109/psce.2004.1397735

Cite

Citations (14)

Control experimentation for undergraduate students

Chaminda Chandrasekara A. Davari

This paper describes automatic control laboratory experiments developed at the Department of Electrical and Computer Engineering at the West Virginia University Institute of Technology. Significance is given to unstructured-based instruction. The laboratory course is offered concurrently with an introductory lecture course in automatic control theory. Experiments are designed to give students thorough understanding of basic concepts and phenomenon of control theory.

Automatic control

Course (navigation)

Computer aided instruction

10.1109/acc.2005.1470842

Cite

Citations (4)

Seismic data processing via homomorphic filtering

A. Davari

Homomorphic deconvolution, a filtering technique, is used to analyze real seismic data. It can separate the wavelet from the impulse train which is formed by convolution. For illustration purposes, four different signals, resulting from regional event, quarry blast, local blast, and a marine explosion, respectively, are considered. The complex cepstrum is also used to detect multiple echoes in a signal. The results show the effectiveness of the method.

Cepstrum

Homomorphic filtering

Convolution (computer science)

Homomorphic Encryption

Impulse response

Finite impulse response

10.1109/ssst.1993.522827

Cite

Citations (2)

New modeling of cold circulating fluidized bed using neural networks

A. Davari Praveen Koduru Amol Patankar

Circulating fluidized beds (CFB) are a relatively new method of forcing chemical reactions to occur in chemical and petroleum industries. In the absence of conventional means to derive a reliable model, we have devised a model of the CFB using neural networks, which have the ability to characterize such complex systems.

Fluidized bed combustion

Forcing (mathematics)

10.1109/wac.2002.1049545

Cite

Citations (1)

Evaluation of three algorithms for nonlinear control of a DC shunt motor

Kourosh Sedghisigarchi A. Hasanovic A. Feliachi A. Davari

The problem of speed control of a DC shunt motor is considered. The objective of the paper is to evaluate the strengths and limitations of three different nonlinear control design methods for the speed of a shunt DC motor. These methods are: feedback linearization, input-output linearization, and fuzzy logic control. These three methods are described in the paper. The simulation results are presented for a DC shunt motor while load torque is changing.

Linearization

Feedback linearization

Electronic speed control

10.1109/ssst.2001.918555

Cite

Citations (8)

Trajectory tracking of UAV using robust inventory control techniques

Shrutika S. Sawant A. Davari Jin Wang

This paper presents a robust inventory control strategy (RICS) for trajectory tracking of unmanned aerial vehicle (UAV). UAV's are generally operated in highly dynamic environments, which include pressure disturbances, wind factor, etc., in addition to high probability of system model uncertainties. RICS incorporates a sliding mode controller to overcome these model uncertainties and noise inherent in any UAV system. It is assumed that uncertain parameters and disturbances are bounded. This method proves to be more effective than conventional methods like PID controllers and model based predictive controllers (MPC). Another important feature of this strategy is that it is easier to tune the controller in face of changing environment, as is the case with UAV's.

Robustness

Tracking (education)

Model Predictive Control

10.1109/ssst.2005.1460885

Cite

Citations (3)

Positive realness and realization of unorthodox impedances

A. Davari

The paper concerns driving point functions with noninterlaced zeros and poles located on the negative real axis. An RLC network can be designed for realization of this type of impedance called unorthodox impedances. The positive realness of these impedances are studied. The determination of residue signs by visual inspection of pole and zero locations is presented. Realizations of double poles alternating with double zeros and triple poles alternating with triple zeros are given.< >

Realization (probability)

Pole–zero plot

RLC circuit

Zero (linguistics)

10.1109/ssst.1991.138562

Cite

Citations (0)

Neural network modeling and control of cold flow circulating fluidized bed

Praveen Koduru A. Davari Lawrence J. Shadle Larry Lawson

Circulating fluidized beds (CFB) are a relatively new method of forcing chemical reactions to occur in chemical and petroleum industries. Compared with conventional fluidized beds, CFB have many advantages including better interfacial contacting and reduced back mixing. The recycle nature of CFB allows for a better process, but also makes modeling and understanding it many more times difficult. The plant under consideration is a cold-flow circulating fluidized bed (CF-CFB), meaning there is no combustion component in it. In the absence of conventional means to derive a reliable model, we have devised a model of the CFB using neural networks (NN), which have the ability to characterize such complex systems. This stems from their ability to approximate arbitrary nonlinear mappings. The main objective is to train a NN model and controller to simulate and control the CFB operation. It has been shown that a NN can be used effectively for the identification and control of nonlinear dynamical processes. Results are presented.

Fluidized bed combustion

Forcing (mathematics)

Fluidization

10.23919/acc.2004.1386772

Cite

Citations (10)

Decentralized control of power systems using-disturbance accommodation techniques

Lingling Fan A. Feliachi A. Davari

This paper presents a method to design decentralized controllers for nonlinear electric power systems. The nonlinearities are handled through a feedback linearization approach, which is applied to each generating unit in the system. Decentralization is achieved by using disturbance accommodation control techniques, where models for the nonlinear interconnections between generators are developed. A three-machine nine-bus power system is used to illustrate the proposed methodology. Nonlinear simulation of the controlled system demonstrates the effectiveness of the control design.

Feedback linearization

Decentralised system

Linearization

Power system simulation

10.1109/acc.2001.945813

Cite

Citations (4)

Decentralized load frequency control in a deregulated environment using disturbance accommodation control theory

Kourosh Sedghisigarchi A. Feliachi A. Davari

In this paper, a decentralized controller is proposed for the load frequency control problem in a deregulated environment. The deregulation scenario considered here assumes that generating units in each area supply regulated power according to their energy contracts. Disturbance accommodating controllers (DAC) are designed which are decentralized controllers using frequency and tie-line power measurements only. Two examples are given to illustrate the proposed approach.

Deregulation

Decentralised system

Automatic Generation Control

Load regulation

Control area

Load management

10.1109/ssst.2002.1027055

Cite

Citations (15)