Browsing Electrical Engineering by Publication Date
Now showing items 21-40 of 2616
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Fuzzy linear parameter estimation algorithms: A new formulation
( Elsevier , 2002 , Article)In this paper, we present a new formulation of a fuzzy linear estimation problem as one of the linear programming where the objective is to minimize the spread of the data points, subject to constraints on each measurement ... -
Analog testing using Zero-Crossing technique
( IEEE , 2002 , Conference Paper)The functional digital testing is defined as a black and white test according to N. Nagi et al.(1998) and B. Vinnakota(1998) by other words, it can determine faulty and non faulty boards. But the analog faults are not. The ... -
New Heuristic Strategies for Reactive Power Compensation of Radial Distribution Feeders
( IEEE , 2002 , Article)In this paper, the authors introduce two new heuristic techniques for reactive power compensation in radial distribution feeders. The methods can be considered as generalization ideas that emerged from recent heuristic ... -
A methodology for time-frequency image processing applied to the classification of nonstationary multichannel signals using instantaneous frequency descriptors with application to newborn EEG signals
( Springer , 2003 , Article)This article presents a general methodology for processing non-stationary signals for the purpose of classification and localization. The methodology combines methods adapted from three complementary areas: time-frequency ... -
Frequency and harmonics evaluation in power networks using fuzzy regression technique
( Elsevier , 2003 , Article)A new technique for frequency and harmonic evaluation in power networks is proposed in this paper. This technique is based on fuzzy linear regression and uses the digitized voltage samples, which are fuzzy numbers, to ... -
Park's transformation application for power system harmonics identification and measurements
( Taylor & Francis , 2003 , Article)This paper presents the application of Park's transformation for identifying and measuring power system harmonics. One of the advantages of the proposed technique is that it does not need a model for the harmonics components ... -
Two digital filtering algorithms for fast estimation of symmetrical components in a power system: A static estimation approach
( Elsevier , 2003 , Article)This paper presents the application of two digital filters working together for fast estimation of power systems symmetrical components. The three-phase unbalanced system is transformed to two phases using α–β-transformation. ... -
End-to-end performance of transmission systems with relays over Rayleigh-fading channels
( IEEE , 2003 , Article)End-to-end performance of two-hops wireless communication systems with nonregenerative relays over flat Rayleigh-fading channels is presented. This is accomplished by deriving and applying some new closed-form expressions ... -
Average ber of multihop communication systems over fading channels
( IEEE , 2003 , Conference Paper)Multihop transmission is a way to attain broader coverage by splitting the communication link from the source to the destination into several, possibly shorter links/hops. This paper presents an expression for the moment ... -
Digital control for UPS inverters
( IEEE , 2003 , Conference Paper)PWM inverters digital controls with dead-beat re sponse, for UPS applications, are reviewed. To improve the output waveforms of the PWM inverter, several modern control techniques are applied together with the deadbeat ... -
A new iterative learning control method for PWM inverter current regulation
( IEEE , 2003 , Conference Paper)AC servomotor speed or current controller based on PI control and/or optimal control, can not eliminate the cyclical fluctuations of speed or current when subject to periodic disturbances. PWM inverters output waveforms ... -
Performance enhancement of relay-assisted communications via binary feedback
( IEEE , 2004 , Conference Paper)This paper proposes a modified two-hop wireless communication system and studies its performance. The modified system has a reliable feedback channel that carries a binary signal from the receiver to inform the transmitter ... -
Design and Assembly of Miniature Zirconia Oxygen Sensors
( IEEE , 2004 , Article)Zirconia oxygen sensors are highly selective solid-state devices used for many applications, including combustion control for better fuel economy and lower emissions. Stabilized zirconia electrolyte meets the device ... -
Identification of individual types of harmonic loads in an electric power system bus
( Elsevier , 2004 , Article)Some buses in a power system feed power to loads that are sources of harmonics. This type of bus is called a complex bus. This paper provides a new application of the constrained least absolute value algorithm (LAV) to ... -
Power system frequency estimation based on simulated annealing: A variable frequency model
( Sharif University of Technology , 2004 , Article)This paper presents a new technique for measuring power system frequency, rate of change of frequency and the voltage amplitude and phase angle using the Simulated Annealing (SA) based optimization algorithm. The algorithm ... -
Harmonic modeling of linear and nonlinear loads based on Kalman filtering algorithm
( Elsevier , 2004 , Article)Most harmonic nonlinear load modeling techniques developed in the last two decades, assume that the load connected to the load bus has a constant admittance, inductive or capacitive, which depends on the mode of operation ... -
Digital measurements of symmetrical components of a multiphase power system
( IEEE , 2004 , Conference Paper)The paper presents a digital algorithm method for measurements of symmetrical components of a multiphase power system, four phases. The models for symmetrical components of the multiphase system are first developed, and ... -
A new digital transformation for harmonics and DC offset removal for the distance fault locator algorithm
( Elsevier , 2004 , Article)This paper presents a new application of Park's transformations to identifying the positive sequence of the fundamental components of the three-phase voltage or current signals needed for fault locator algorithm. The problem ... -
Identification of individual types of harmonic loads in an electric power system-bus
( Elsevier , 2004 , Article)Some buses in a power system feed power to loads that are sources of harmonics. This type of bus is called a complex-bus. This paper provides a new application of the constrained least absolute value algorithm (LAV) to ... -
On-line estimation of transformer model parameters
( IEEE , 2004 , Conference Paper)The conventional method for determining the parameters of the transformer is to performing the open and short-circuited tests. The method is only suitable for off-line application. This paper presents an alternative approach ...