Ali Keyhani. Faculty Emeritus, Electrical & Computer Engr. Room # Neil Ave Columbus, OH [email protected] Ali Keyhani is on Facebook. Join Facebook to connect with Ali Keyhani and others you may know. Facebook gives people the power to share and makes the. . View the profiles of people named Ali Keyhani. Join Facebook to connect with Ali Keyhani and others you may know. Facebook gives people the power to.
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Log In Sign Up. Add Social Profiles Facebook, Twitter, etc. His recent technical books are: Professor Keyhani recent interests are in the history of science, medicine, and literature on golden age Iranian culture and he is a writer of Sufi Tales. His Sufi Tales are published by Amazon. Neural network observers for on-line tracking of synchronous generator parameters more. Iteratively reweighted least squares for maximum likelihood identification of synchronous machine parameters from on-line tests more.
Torque ripple analysis of a permanent magnet brushless DC motor using finite element method more. As a function of the rotor position, the torque produced by these machines has pulsating component in addition to the dc component.
This pulsating torque has a This pulsating torque has a fundamental frequency corresponding A new operating paradigm is still needed for the power industry in order to achieve a workable deregulated market. The two main proposals, namely the Bilateral and the Poolco models, even though their original intents were to promote The two main proposals, namely the Bilateral and the Poolco models, even though their original intents were to promote efficiency in a deregulated industry, in order to be workable need a powerful centralized organization.
They consequently end up operating in the same way as the regulated industry. The coordinated multilateral trading model lets the suppliers and consumers make a profit on their own while the Power System Operator only intervenes if the security of the power network is threatened.
The PSO gives sufficient information about the status of the power network so that the brokers can arrange trades without endangering the security of the network. Moreover the economic data of the participants is private, thus encouraging economic competition in a free market. It ieyhani shown that the process of building such trades leads to an efficient use of the power network, Design of saturable chokes for industrial electronic systems more. A finite-element-based three-dimensional field solution for the magnetically saturable chokes that are used in many industrial electronics systems is presented.
The inductances computed based on the finite-element field solution are Kryhani inductances computed based on the finite-element field solution are compared with the estimated nonlinear inductances from actual measurements. The results show the adequacy of the three-dimensional finite-elements aoi. The results of the field solution are used to study the factors that influence the nonlinear characteristics of the chokes, such as the air-gap geometry, the equivalent winding turns and the property of material anisotropy.
The algorithm can achieve control over unity input power The algorithm can achieve control over unity input power factor and provide low total harmonic distortions keyhqni input and output line currents.
The control is performed in the DQ rotating reference frame and incorporates qli modified space vector PWM strategy for determination of switching instants. A control algorithm has been derived to provide decoupling of the d and q-axis responses, allowing effective use of linear controllers to force the error signal to zero.
Design of pulse width modulation based smart switch controller for automotive applications more. The design employs a smart switch This smart switch is a monolithic device with built-in protection features such as thermal shutdown, linear current limitation, short circuit protection and over-voltage clamp.
These models have been validated against experimental data. The paper contains a comparison of the two design schemes in terms of the size and number of components required. Modeling and Robust Nonlinear Control more. In this paper, we consider a fuel cell based distributed generation system unit which includes a PEM fuel cell, a storage element batteryand a boost DC-DC converter.
A dynamic model of the overall system is developed and a nonlinear A dynamic model of the overall system is developed and a nonlinear robust control design that depends only on signal measurements available in typical practical implementations is proposed.
Ali Keyhani –
The control design addresses both the fuel cell inputs hydrogen and oxygen supply pressures and PWM control of the switch in the boost DC-DC converter.
Adaptations are utilized to handle uncertainty in system parameters. Induction motor parameter identification from operating data for electric drive applications more.
Gateway to the New Millennium. Modeling and Parameter Identification of Electric Machines more. Electrical and Computer Engineering. Power system stabilization based on modular neural network architecture more.
Backpropagation neural networks have recently been applied to problems in power system stabilizer modeling. When trained to respond differently to different operating conditions, these networks tend to produce interference between When trained to respond differently to different operating conditions, these networks tend to produce interference between conflicting solutions.
In recent years, modular Digital simulation and spectral density analysis of low-frequency power oscillations for array processor-based applications more.
The results of simulation studies of a one-machine, infinite-bus system are presented. Electrical And Electronic Engineering. Induction machine parameter tracking from test data via PWM inverters more. This paper presents a new method that can track induction machine parameters for different keyyhani conditions using the machine power converter.
The maximum likelihood estimation method is used for identification. The machine is tested The machine is tested using the power converter in three different modes.
In the first test, while keygani machine is at standstill, a voltage pulse is applied to the stator. Identification of armature circuit and field winding parameters of large utility generators more. This paper presents a methodology to estimate armature circuit and field keyhanii parameters of large utility generators using both the synthetic data obtained by the machine natural abc frame of reference simulation and real time This paper presents a methodology to estimate armature oeyhani and field winding parameters of large utility generators using both the synthetic data obtained by the machine natural abc frame of reference simulation and real time operating data of a utility generator.
A one-machine infinite bus system including the machine and its excitation ieyhani is simulated in the abc frame of. Identification of parameters of an AC machine from standstill time domain data more. The authors present an evaluation of the performance of the maximum likelihood ML method when used to estimate the linear keyhanj of a synchronous machine model from the standstill time-domain flux decay test data. It is shown that a It is shown that a unique set of parameters can be obtained and the noise effects can be dealt with effectively when the ML estimation technique.
Fuel cell based distributed generation system more. A dynamic model of the fuel cell is considered. To boost low -output DC voltage of the To boost low -output DC voltage of the fuel cell to high DC voltage keyhwni to Comparative study of polar and Cartesian co-ordinate algorithms for power-system state-estimation problems more.
ABSTRACT The paper presents a detailed study of the convergence characteristics and an assessment of the performance of three algorithms used to solve the power-system state estimation problem. These algorithms are the polar co-ordinate These algorithms are the polar co-ordinate formulations of the full and fast-decoupled weighted least squares WLS and the Cartesian co-ordinate WLS.
These algorithms are studied and compared to determine their convergence patterns on several measurement sets consisting of line flows, busbar injections, voltage keyhnai and the network ill-conditioning. The algorithms were tested on different IEEE test systems. Results are presented to illustrate the convergence performance. Market monitoring and leader follower incentive control of ancillary services more. Analysis of coordinated multilateral trades more.
Sensorless control of induction motors more. Abstract A sensorless torque control system for induction motors was developed in this research. The system allows for fast and precise torque tracking over a wide range of speed. Unlike most research in the area, the authors used an Lai most research in the area, the kfyhani used an induction motor model that adapts In this paper, keyhxni propose a robust nonlinear force controller for a switched reluctance motor SRM electromechanical brake system which is a promising replacement for hydraulic brakes in the automotive industry.
A detailed model of the A detailed model of the motor including current dependent inductance coefficients is used. The load exerted on the motor by the caliper may be modeled as a spring; however.
Conference on Decision and Control. This work presents a new digital control strategy of a three-phase PWM inverter for uninterruptible power supplies UPS systems. To achieve a fast transient response, a good voltage regulation, nearly zero steady state inverter output To achieve a fast transient response, a good voltage regulation, nearly zero steady state inverter output voltage error, and low total harmonic distortion THDthe proposed control method consists of two discrete-time feedback controllers: Procedia – Social and Behavioral Sciences.
Estimation of permanent magnet motor parameters more. To properly design and optimize a control system of a permanent-magnet PM machine, the machine model and its parameters must be known. This study presents a method for developing a model and estimating the parameters of a PM machine This study presents a method for developing a model and estimating the parameters of a PM machine from standstill time-domain step response data.
A dq-axis equivalent circuit model with a general number of damper windings is defined to describe the behavior of the PM machine.