Your browser does not support JavaScript!
http://iet.metastore.ingenta.com
1887
banner image
image of Volume 4, Issue 2
Online ISSN 1751-8679 Print ISSN 1751-8660

IET Electric Power Applications

Volume 4, Issue 2, February 2010

Volumes & issues:

Volume 4, Issue 2

February 2010

Show / Hide details

    • Three-phase doubly fed induction generators: an overview
      • Author(s): M. Tazil ; V. Kumar ; R.C. Bansal ; S. Kong ; Z.Y. Dong ; W. Freitas ; H.D. Mathur
      • Source: IET Electric Power Applications, Volume 4, Issue 2, p. 75 –89
      • DOI:  10.1049/iet-epa.2009.0071
      • Type: Article
      • + Show details - Hide details
      • p. 75 –89 (15)
        Adjustable speed induction generators, especially the doubly fed induction generators (DFIG), are becoming increasingly popular due to their various advantages over fixed speed generator systems. A DFIG in a wind turbine has the ability to generate maximum power with varying rotational speed, ability to control active and reactive power by the integration of electronic power converters such as the back-to-back converter, low rotor power rating resulting in low cost converter components, and so on. This study presents an extensive literature survey over past 25 years on the different aspects of DFIG.
        Add to favourites
        Export citations
      Comparison between vibration and stator current analysis for the detection of bearing faults in asynchronous drives
      • Author(s): B. Trajin ; J. Regnier ; J. Faucher
      • Source: IET Electric Power Applications, Volume 4, Issue 2, p. 90 –100
      • DOI:  10.1049/iet-epa.2009.0040
      • Type: Article
      • + Show details - Hide details
      • p. 90 –100 (11)
        This study deals with the application of vibration and motor current spectral analysis for the monitoring of rolling bearings damage in asynchronous drives. Vibration measurement is widely used to detect faulty bearings operations. However, this approach is expensive and cannot always be performed, while electrical quantities such as the machine stator current are often already measured for control and detection purposes. Signal processing methods and global indicators associated with bearing fault detection of vibration measurements are recalled. Compared to these methods, an automatic detector based on vibration spectral energy extraction is then proposed and its performances are discussed. Moreover, load torque measurements underlines that bearing faults also induce mechanical load torque oscillations. Therefore a theoretical stator current model in case of load torque oscillations is used to demonstrate the presence of phase modulation (PM) on stator currents. Frequency behaviour of the related sideband components is strongly investigated for monitoring purposes. Thus, a fault detector using the extraction of spectral energy of stator current is proposed to detect damaged bearings. This detector is then compared to the one defined on vibration signals.
        Add to favourites
        Export citations
      Performance investigation of modified hysteresis current controller with the permanent magnet synchronous motor drive
      • Author(s): A.N. Tiwari ; P. Agarwal ; S.P. Srivastava
      • Source: IET Electric Power Applications, Volume 4, Issue 2, p. 101 –108
      • DOI:  10.1049/iet-epa.2009.0022
      • Type: Article
      • + Show details - Hide details
      • p. 101 –108 (8)
        This study presents complete permanent magnet synchronous motor (PMSM) drive scheme along with mathematical model of motor and inverter. Speed proportional integral (PI) controller parameters are designed in discrete time domain. Stability of the speed controller is observed with respect to motor-load parameters. A modified hysteresis current control scheme is implemented for the drive and a detailed comparative study is done with conventional hysteresis current control scheme. Merits of the modified hysteresis current controller over conventional hysteresis current controller are investigated with both simulation and experimental results.
        Add to favourites
        Export citations
      Power density improvement of three phase flux reversal machine with distributed winding
      • Author(s): D.S. More  and  B.G. Fernandes
      • Source: IET Electric Power Applications, Volume 4, Issue 2, p. 109 –120
      • DOI:  10.1049/iet-epa.2009.0003
      • Type: Article
      • + Show details - Hide details
      • p. 109 –120 (12)
        The three phase flux reversal machine (FRM) is a doubly salient permanent magnet machine with concentrated windings. This study proposes the distributed winding for this machine. This winding (i.e. full pitch winding) offers high-power density and improves the efficiency. The permanent magnet (PM) flux linking the stator winding has effectively two or four pole flux pattern, which depends on the number of stator poles and independent of number of rotor poles. Finite element method (FEM) analysis is performed on the concentrated stator pole winding FRM (CSPFRM) and proposed full pitch winding FRM (FPFRM) to obtain induced EMF, flux linkages and inductance of the winding. The inductance of both machines is also obtained using winding function approach and compared with FEM results. The effect of armature reaction is compensated by capacitive series compensation to improve the voltage regulation. FEM analysis is also carried out on both the compensated generators to evaluate the power density. Speed of the flux pattern and that of the rotor is different in FRM. The ratio of these two speeds is termed as fictitious ‘electrical gear’. FRM and permanent magnet synchronous machine (PMSM) have sinusoidal terminal voltage and surface mounted PMs. The power density of both machines is compared using the concept of fictitious ‘electrical gear’. To verify the above analysis, a 6/14 pole FRM with distributed and concentrated winding is designed and fabricated. The experimental results are in close agreement with simulated results.
        Add to favourites
        Export citations
      Implementation of an adaptive position control system of a permanent-magnet synchronous motor and its application
      • Author(s): T.-H. Liu ; H.-T. Pu ; C.-K. Lin
      • Source: IET Electric Power Applications, Volume 4, Issue 2, p. 121 –130
      • DOI:  10.1049/iet-epa.2009.0036
      • Type: Article
      • + Show details - Hide details
      • p. 121 –130 (10)
        This study proposes an adaptive backstepping controller design for a position control system of permanent-magnet synchronous motors (PMSMs). The proposed system has good performance, including fast transient responses, good steady-state responses and good tracking responses. Based on a proper Lyapunov function, an adaptive backstepping position controller can be systematically developed. In addition, a notch filter is used in the current loop to reduce the limit cycles of the motor current. The control algorithm is implemented by using a Renesas digital signal processor. As a result, the hardware is very simple. The proposed control system includes a position-loop controller and a current-loop controller. All control loops are executed by the digital signal processor. Several experimental results are shown to validate the correctness and feasibility of the proposed control algorithms. The system can achieve a precise position control. In fact, a ball–screw table and a knitting machine have been applied to evaluate the performance of the control system. The study provides a new direction in the use of an advanced control technique in PMSMs and investigates its real industrial applications.
        Add to favourites
        Export citations

Most viewed content for this Journal

Article
content/journals/iet-epa
Journal
5
Loading

Most cited content for this Journal

Print this page
This is a required field
Please enter a valid email address