The Experts below are selected from a list of 263376 Experts worldwide ranked by ideXlab platform

A.l. Mohamadein - One of the best experts on this subject based on the ideXlab platform.

  • Theory and performance of series connected synchronous motor
    Conference Record of the 2000 IEEE Industry Applications Conference. Thirty-Fifth IAS Annual Meeting and World Conference on Industrial Applications o, 2000
    Co-Authors: Y.g. Dessouky, A.l. Mohamadein
    Abstract:

    Series connected synchronous motor (SCSM) is an induction motor with stator and rotor windings connected in series. This motor operates at twice the normal synchronous speed. This paper presents theoretical and experimental investigation for steady state performance based on a Phasor Diagram as derived from the relation between voltages, currents and fluxes of the machine.

  • Theory and performance of series connected self-excited synchronous generators
    IEEE Transactions on Energy Conversion, 1995
    Co-Authors: A.l. Mohamadein, E.a. Shehata
    Abstract:

    The series connected self-excited synchronous generator is a slip ring type induction machine with stator and rotor windings connected in series along with excitation capacitors. The machine, when self-excited, will yield an output voltage with a frequency equal to half the rotor angular speed. This paper presents analytical as well as experimental investigations into machine performance. The analysis is based on a deduced Phasor Diagram. The suggested method of analysis is simple and makes it possible to study the effect of machine parameters on its performance. Useful conclusions are given showing proper design considerations to be accounted for to allow the machine to develop acceptable output levels.

A. M. Osheiba - One of the best experts on this subject based on the ideXlab platform.

  • Steady-State Analysis of a Self-Excited Single-Phase Reluctance Generator
    IEEE Transactions on Energy Conversion, 2007
    Co-Authors: S. M. Allam, M. A. El-khazendar, A. M. Osheiba
    Abstract:

    This paper presents an analytical method for predicting the steady-state performance of a self-excited single-phase reluctance generator (SESPRG), which supplies R-- L load. The proposed analysis is based on the d--q axis model and Phasor Diagram of such a generator in the steady-state condition. Excitation capacitors are connected across both the main and auxiliary windings. Magnetic saturation is taken into account and is assumed to be confined to the direct axis, and is accounted for a variable direct-axis magnetizing reactance. Conditions of self-excitation and the minimum value of the capacitance required to achieve self-excitation are also given. Special attention is focused on the machine performance when it operates as a pure single-phase reluctance generator (PSPRG). A fixed-capacitor (FC) thyristor-controlled reactor (TCR) scheme is used to regulate the generator terminal voltage by controlling the thyristor conduction angle. Further stability limits are investigated by developing the active-reactive (P-Q) power Diagram. Reasonably close agreement between the measured and predicted results is observed confirming the validity of the proposed analysis.

  • Modelling and controller design of an isolated diesel engine permanent magnet synchronous generator
    IEEE Transactions on Energy Conversion, 1996
    Co-Authors: M.a. Rahman, A. M. Osheiba, T.s. Radwan, E.s. Abdin
    Abstract:

    A method to analyze the steady-state performance of a stand-alone permanent magnet synchronous generator driven by a diesel engine is presented. The proposed method is based on equivalent d-q circuits and the Phasor Diagram of such a generator under steady-state conditions. A fixed capacitor-thyristor controlled reactor scheme is used to regulate the generator terminal voltage by controlling the thyristor ignition angle. Furthermore the overall system dynamics are modelled in terms of state variables and control inputs. Based on a reduced order linearized model, digital optimal state and output feedback controllers are designed by minimising a quadratic performance index using the dynamic programming technique. The objective of the controller is to maintain the load voltage and frequency constant under varying load conditions. The controller's effectiveness is assessed by examining the closed-loop system response to sudden load changes.

E.a. Shehata - One of the best experts on this subject based on the ideXlab platform.

  • Theory and performance of series connected self-excited synchronous generators
    IEEE Transactions on Energy Conversion, 1995
    Co-Authors: A.l. Mohamadein, E.a. Shehata
    Abstract:

    The series connected self-excited synchronous generator is a slip ring type induction machine with stator and rotor windings connected in series along with excitation capacitors. The machine, when self-excited, will yield an output voltage with a frequency equal to half the rotor angular speed. This paper presents analytical as well as experimental investigations into machine performance. The analysis is based on a deduced Phasor Diagram. The suggested method of analysis is simple and makes it possible to study the effect of machine parameters on its performance. Useful conclusions are given showing proper design considerations to be accounted for to allow the machine to develop acceptable output levels.

Maher Hasan - One of the best experts on this subject based on the ideXlab platform.

  • Tesla’s Contribution to Electric Machine Analysis
    2018 IEEE Power & Energy Society General Meeting (PESGM), 2018
    Co-Authors: Paul Krause, Oleg Wasynczuk, Timothy O’connell, Maher Hasan
    Abstract:

    In the late 1920s, R. H. Park published a change of variables that provided a means of analyzing the performance of synchronous machines. He transformed the stator variables to substitute variables that eliminated the rotor-position-dependent terms from the self- and mutual inductances. This transformation has become the bedrock of machine analysis and simulation; however, Park's derivation involves a maze of three phase trigonometric identities with generator action and we are left searching for a more concise analytical development. In this paper, a direct connection is established between Tesla's rotating magnetic field and reference frame theory. In particular, an analytical basis for the change of variables is established from the expression of Tesla's rotating magnetic field combined with an expression that relates stationary and rotating coordinates. This leads directly to reference frame theory and an array of transformations that yield the same advantages as Park's transformation. It shows that all transformations used in the analysis of power systems, electric machines, and drive systems have a common origin. Also, the magnetic poles can be analytically located during transient operation and on a Phasor Diagram during steady-state operation, thereby providing a vivid visualization of machine and drive operation.

  • Tesla's Contribution to Electric Machine Analysis
    IEEE Transactions on Energy Conversion, 2017
    Co-Authors: Paul C. Krause, Oleg Wasynczuk, Timothy C. O'connell, Maher Hasan
    Abstract:

    In the late 1920s, R. H. Park published a change of variables that provided a means of analyzing the performance of synchronous machines. He transformed the stator variables to substitute variables that eliminated the rotor-position-dependent terms from the self- and mutual inductances. This transformation has become the bedrock of machine analysis and simulation; however, Park's derivation involves a maze of three-phase trigonometric identities with generator action and we are left searching for a more concise analytical development. In this paper, a direct connection is established between Tesla's rotating magnetic field and reference frame theory. In particular, an analytical basis for the change of variables is established from the expression of Tesla's rotating magnetic field combined with an expression that relates stationary and rotating coordinates. This leads directly to reference frame theory and an array of transformations that yield the same advantages as Park's transformation. It shows that all transformations used in the analysis of power systems, electric machines, and drive systems have a common origin. Also, the magnetic poles can be analytically located during transient operation and on a Phasor Diagram during steady-state operation, thereby providing a vivid visualization of machine and drive operation.

E.s. Abdin - One of the best experts on this subject based on the ideXlab platform.

  • Modelling and controller design of an isolated diesel engine permanent magnet synchronous generator
    IEEE Transactions on Energy Conversion, 1996
    Co-Authors: M.a. Rahman, A. M. Osheiba, T.s. Radwan, E.s. Abdin
    Abstract:

    A method to analyze the steady-state performance of a stand-alone permanent magnet synchronous generator driven by a diesel engine is presented. The proposed method is based on equivalent d-q circuits and the Phasor Diagram of such a generator under steady-state conditions. A fixed capacitor-thyristor controlled reactor scheme is used to regulate the generator terminal voltage by controlling the thyristor ignition angle. Furthermore the overall system dynamics are modelled in terms of state variables and control inputs. Based on a reduced order linearized model, digital optimal state and output feedback controllers are designed by minimising a quadratic performance index using the dynamic programming technique. The objective of the controller is to maintain the load voltage and frequency constant under varying load conditions. The controller's effectiveness is assessed by examining the closed-loop system response to sudden load changes.