The Experts below are selected from a list of 27099 Experts worldwide ranked by ideXlab platform
Robert H. Lasseter - One of the best experts on this subject based on the ideXlab platform.
-
Power quality enhancement of a wind-turbine generator under variable wind Speeds using matrix converter
2008 IEEE Power Electronics Specialists Conference, 2008Co-Authors: H. Nikkhajoei, Robert H. LasseterAbstract:This paper proposes the use of a direct AC-AC matrix converter, as an alternative to the DC-link voltage-sourced converter, for wind-turbine induction generators. The matrix converter provides a smooth transition of the generator Speed through its Synchronous Speed and therefore, variations of the wind Speed can be followed by the generator in a smooth fashion. Thus, the generator provides a high power quality for the load, in spite of wind Speed variations. Furthermore, the converter enables the generator to operate around its Synchronous Speed where the efficiency of overall wind conversion system is higher. A switching strategy is developed for the matrix converter to operate in a wind-turbine induction generator system. Based on a dynamic model of the overall wind energy conversion system, a controller for the matrix converter is designed. Dynamic performance of the matrix converter based wind energy conversion system operating under variable wind Speeds is evaluated.
-
Power Quality Enhancement of a Wind-Turbine Generator Under Variable Wind Speeds Using
2008Co-Authors: Matrix Converter, H. Nikkhajoei, Robert H. LasseterAbstract:This paper proposes the use of a direct AC-AC matrix converter, as an alternative to the DC-link voltage-sourced con- verter, for wind-turbine induction generators. The matrix con- verter provides a smooth transition of the generator Speed through its Synchronous Speed and therefore, variations of the wind Speed can be followed by the generator in a smooth fashion. Thus, the generator provides a high power quality for the load, in spite of wind Speed variations. Furthermore, the converter enables the generator to operate around its Synchronous Speed where the ef- ficiency of overall wind conversion system is higher. A switching strategy is developed for the matrix converter to operate in a wind- turbine induction generator system. Based on a dynamic model of the overall wind energy conversion system, a controller for the matrix converter is designed. Dynamic performance of the matrix converter based wind energy conversion system operating under variable wind Speeds is evaluated.
Sadokpam Romita Devi - One of the best experts on this subject based on the ideXlab platform.
-
Independent Control of Active and Reactive Powers of a DFIG Based Wind Energy Conversion System by Vector Control
2015Co-Authors: A Ibrahim Ahmad, D. Anitha, Sadokpam Romita DeviAbstract:The paper deals with a design and implementation of a doubly fed induction generator (DFIG) wind energy conversion system (WECS) connected to the power grid. A back-to-back AC/DC/AC converter is incorporated between the stator and the rotor windings of a DFIG, in order to obtain variable Speed operation. The DFIG can be controlled from sub-Synchronous Speed to super Synchronous Speed operation. The main objective of the paper is to control the flow of the Active and Reactive powers produced by the DFIG based wind energy conversion system. A vector control strategy with stator flux orientation is applied to both the grid side converter and the rotor side converter for the independent control of Active and reactive powers produced by the DFIG based wind energy conversion system. The system along with its control circuit were simulated in a Matlab/simulink and the results are presented and discussed.
-
ACTIVE AND REACTIVE POWER CONTROL OF A DFIG BASED WIND ENERGY CONVERSION SYSTEM BY VECTOR CONTROL
2015Co-Authors: A Ibrahim Ahmad, D. Anitha, Sadokpam Romita DeviAbstract:The paper deals with a design and implementation of a doubly fed induction generator (DFIG) wind energy conversion system (WECS) connected to the power grid. A back-to-back AC/DC/AC converter is incorporated between the stator and the rotor windings of a DFIG, in order to obtain variable Speed operation. The DFIG can be controlled from sub-Synchronous Speed to super Synchronous Speed operation. The main objective of the paper is to control the flow of the Active and Reactive powers produced by the DFIG based wind energy conversion system. A vector control strategy with stator flux orientation is applied to both the grid side converter and the rotor side converter for the independent control of Active and reactive powers produced by the DFIG based wind energy conversion system. The system along with its control circuit was simulated in a Matlab/simulink and the results are presented and discussed.
Essam M. Rashad - One of the best experts on this subject based on the ideXlab platform.
-
Theory and steady-state analysis of series-connected wound-rotor induction motor in sub-Synchronous mode
2016 IEEE International Conference on Power and Energy (PECon), 2016Co-Authors: Essam M. RashadAbstract:The wound-rotor induction machine is capable of electromechanical energy conversion, if the stator and rotor windings are connected in series with a proper phase sequence. As a motor, the operation can be in one of two modes. In the first mode, the motor runs at exactly twice the Synchronous Speed for stable loading conditions. In the second mode, the motor runs at a Speed below the Synchronous Speed (sub-Synchronous) with self-starting capability in a manner similar to that of the normal operation mode as an induction motor. In this paper, the operation of the motor in the sub-Synchronous mode is analyzed using the physical relationships between the stator and rotor mmfs. The analysis includes the calculation of losses and efficiency. The obtained laboratory experimental results proved the validity of the proposed analysis.
-
Dynamic performance of series-connected wound rotor induction motor
2010 IEEE International Conference on Power and Energy, 2010Co-Authors: Essam M. RashadAbstract:Series-connected induction motor has the ability of operation either at two Speeds; the first one is less than the Synchronous Speed depending on the load, while the second Speed is exactly double the Synchronous Speed. The motor has the capability of self-starting to reach the first Speed. In addition to special arrangements required to attain the second (higher) Speed, instability problems have been noted in experimental operation. This paper presents a complete dynamic analysis of motor when supplied from a variable voltage variable frequency power supply. The starting behavior has been presented as well as frequency change for both no-load and loaded conditions. Experimental results are given to check model validity in dynamic conditions.
A Ibrahim Ahmad - One of the best experts on this subject based on the ideXlab platform.
-
Independent Control of Active and Reactive Powers of a DFIG Based Wind Energy Conversion System by Vector Control
2015Co-Authors: A Ibrahim Ahmad, D. Anitha, Sadokpam Romita DeviAbstract:The paper deals with a design and implementation of a doubly fed induction generator (DFIG) wind energy conversion system (WECS) connected to the power grid. A back-to-back AC/DC/AC converter is incorporated between the stator and the rotor windings of a DFIG, in order to obtain variable Speed operation. The DFIG can be controlled from sub-Synchronous Speed to super Synchronous Speed operation. The main objective of the paper is to control the flow of the Active and Reactive powers produced by the DFIG based wind energy conversion system. A vector control strategy with stator flux orientation is applied to both the grid side converter and the rotor side converter for the independent control of Active and reactive powers produced by the DFIG based wind energy conversion system. The system along with its control circuit were simulated in a Matlab/simulink and the results are presented and discussed.
-
ACTIVE AND REACTIVE POWER CONTROL OF A DFIG BASED WIND ENERGY CONVERSION SYSTEM BY VECTOR CONTROL
2015Co-Authors: A Ibrahim Ahmad, D. Anitha, Sadokpam Romita DeviAbstract:The paper deals with a design and implementation of a doubly fed induction generator (DFIG) wind energy conversion system (WECS) connected to the power grid. A back-to-back AC/DC/AC converter is incorporated between the stator and the rotor windings of a DFIG, in order to obtain variable Speed operation. The DFIG can be controlled from sub-Synchronous Speed to super Synchronous Speed operation. The main objective of the paper is to control the flow of the Active and Reactive powers produced by the DFIG based wind energy conversion system. A vector control strategy with stator flux orientation is applied to both the grid side converter and the rotor side converter for the independent control of Active and reactive powers produced by the DFIG based wind energy conversion system. The system along with its control circuit was simulated in a Matlab/simulink and the results are presented and discussed.
M. Niaz Azari - One of the best experts on this subject based on the ideXlab platform.
-
Performance Improvement of a Slotted Solid Rotor Induction Motor with High Temperature Superconder Coating
International Journal of Engineering Transactions B: Applications, 2019Co-Authors: M. Niaz AzariAbstract:This paper analyzes an induction motor with high temperature superconducter (HTS) coated slotted solid rotor. By slotting the solid rotor, the electromagnetic torque near Synchronous Speed will increase but the starting torque will decrease. To improve starting torque, rotor slots are coated with HTS materials. Using HTS material vary the rotor resistance to great extends in starting step and this means the starting torque will be maximized. Also the torque near Synchronous Speed will be higher than before because of the resistance of the HTS is completely zero in this period. This would help the torque become more than the case without any coating. It is concluded that, HTS coating of slotted solid rotor will increase the starting torque by 42 and 74% than smooth type rotor and slotted one, respectively. For case-study motor, the torque near Synchronous Speed these improvements were 75% and 33%, respectively. The performance of the proposed motor is simulated using finite element method (FEM).
-
Performance Improvement of a Slotted Solid Rotor Induction Motor with High Temperature Superconder Coating
International Journal of Engineering Transactions B: Applications, 2019Co-Authors: M. Niaz AzariAbstract:This paper analyzes an induction motor with high temperature superconducter (HTS) coated slotted solid rotor. By slotting the solid rotor, the electromagnetic torque near Synchronous Speed will increase but the starting torque will decrease. To improve starting torque, rotor slots are coated with HTS materials. Using HTS material vary the rotor resistance to great extends in starting step and this means the starting torque will be maximized. Also the torque near Synchronous Speed will be higher than before because of the resistance of the HTS is completely zero in this period. This would help the torque become more than the case without any coating. It is concluded that, HTS coating of slotted solid rotor will increase the starting torque by 42 and 74% than smooth type rotor and slotted one, respectively. For case-study motor, the torque near Synchronous Speed these improvements were 75% and 33%, respectively. The performance of the proposed motor is simulated using finite element method (FEM).
