The Experts below are selected from a list of 324 Experts worldwide ranked by ideXlab platform

S.k. Panda - One of the best experts on this subject based on the ideXlab platform.

  • Direct method of overmodulation with integrated closed loop stator Flux Vector control
    IEEE Transactions on Power Electronics, 2005
    Co-Authors: A. Tripathi, A.m. Khambadkone, S.k. Panda
    Abstract:

    Overmodulation achieves full utilization of installed dc link voltage, by modifying the magnitude and the phase of reference voltage Vector. Due to the nonlinear behavior in this region, closed loop Vector control becomes difficult. A simple method of overmodulation with closed loop control of stator Flux Vector is proposed in this paper. Instead of modifying the voltage reference by nonlinear equations or look up table, we propose a direct method to generate the switching times. In so doing, the average angular velocity of the stator Flux Vector is controlled linearly throughout the modulation range. The proposed method shows lower harmonic distortion compared with existing methods. It greatly reduces the complexity and cost of achieving overmodulation over existing schemes.

  • Stator Flux based space-Vector modulation and closed loop control of the stator Flux Vector in overmodulation into six-step mode
    IEEE Transactions on Power Electronics, 2004
    Co-Authors: A. Tripathi, A.m. Khambadkone, S.k. Panda
    Abstract:

    This paper presents closed loop control of stator Flux Vector in a wide operating range that can be used in torque control. A predictive control achieves zero phase error at constant switching frequency. Space Vector modulation based on stator Flux error Vector is used to achieve control of stator Flux over the entire range including overmodulation and six-step. During dynamics the fastest possible Flux Vector change is employed similar to the direct torque control. Experimental results are provided for a wide speed range and effect of parameter variation is studied.

M.f. Rahman - One of the best experts on this subject based on the ideXlab platform.

  • a direct Flux Vector controlled induction generator with space Vector modulation for integrated starter alternator
    IEEE Transactions on Industrial Electronics, 2007
    Co-Authors: Jun Zhang, M.f. Rahman
    Abstract:

    A direct-Flux-Vector-controlled scheme of induction generator has been proposed in this paper for future 42-V automobile application. The fundamental relationship between the rotating speed of the stator Flux Vector and torque is analyzed. A simple structure with only one proportional-integral (PI) controller is shown to implement the torque and Flux controls adequately. By controlling the electromagnetic torque of the induction machine, the required dc-bus voltage can be well regulated within the 42-V PowerNet specifications. Fixed switching frequency and low torque ripple are obtained with space-Vector modulation technique. Simulation and experimental results indicate that the proposed scheme provides a practical solution for an integrated starter alternator other than the widely applied field-oriented- control scheme.

  • Direct Flux Vector control scheme for induction machine drives with space Vector modulation
    Fourtieth IAS Annual Meeting. Conference Record of the 2005 Industry Applications Conference 2005., 2005
    Co-Authors: Jun Zhang, M.f. Rahman
    Abstract:

    In this paper, an improved torque controller of induction machine based on direct control of stator Flux linkage Vector is presented. The fundamental relationship between the rotating speed of the stator Flux linkage and torque is analyzed and the design principle of controller is presented. A simple structure with only one proportional-integral (PI) controller is shown to implement the torque and Flux control adequately. Parameters of PI regulator are easily found in the proposed design principle. Robust design of the direct Flux Vector ensures the system is not sensitive to the variation of rotor resistance. Fixed switching frequency and low torque ripple are obtained with PI control and space Vector modulation (SVM) method. Satisfactory modeling results indicate the feasibility of the proposed direct Flux Vector control scheme.

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

  • Direct method of overmodulation with integrated closed loop stator Flux Vector control
    IEEE Transactions on Power Electronics, 2005
    Co-Authors: A. Tripathi, A.m. Khambadkone, S.k. Panda
    Abstract:

    Overmodulation achieves full utilization of installed dc link voltage, by modifying the magnitude and the phase of reference voltage Vector. Due to the nonlinear behavior in this region, closed loop Vector control becomes difficult. A simple method of overmodulation with closed loop control of stator Flux Vector is proposed in this paper. Instead of modifying the voltage reference by nonlinear equations or look up table, we propose a direct method to generate the switching times. In so doing, the average angular velocity of the stator Flux Vector is controlled linearly throughout the modulation range. The proposed method shows lower harmonic distortion compared with existing methods. It greatly reduces the complexity and cost of achieving overmodulation over existing schemes.

  • Stator Flux based space-Vector modulation and closed loop control of the stator Flux Vector in overmodulation into six-step mode
    IEEE Transactions on Power Electronics, 2004
    Co-Authors: A. Tripathi, A.m. Khambadkone, S.k. Panda
    Abstract:

    This paper presents closed loop control of stator Flux Vector in a wide operating range that can be used in torque control. A predictive control achieves zero phase error at constant switching frequency. Space Vector modulation based on stator Flux error Vector is used to achieve control of stator Flux over the entire range including overmodulation and six-step. During dynamics the fastest possible Flux Vector change is employed similar to the direct torque control. Experimental results are provided for a wide speed range and effect of parameter variation is studied.

Mukul C. Chandorkar - One of the best experts on this subject based on the ideXlab platform.

  • Flux Vector modulation for single-phase inverter with LC output filter
    2014 IEEE Applied Power Electronics Conference and Exposition - APEC 2014, 2014
    Co-Authors: Dhaval C. Patel, Ritwik Chattopadhyay, Sachin Madhusoodhanan, Subhashish Bhattacharya, Rajendra R. Sawant, Mukul C. Chandorkar
    Abstract:

    The inverter often connects to load or grid through inductor-capacitor (LC) filter for feeding the filtered voltage and current. The carrier based modulation techniques, such as sinusoidal pulse width modulation (SPWM) and space Vector modulation (SVM), require some kind of current control in LC filter connected inverter to damp out the LC resonance. The major advantage of Flux Vector modulation for the inverter with output LC filter is that the voltage control loop alone can damp out the resonance of LC filter. Hence, there is no need to use extra passive components or active damping controller. In this paper, the Flux Vector modulation for single-phase voltage source inverter (VSI) is proposed. The theoretical development and the digital implementation steps of Flux Vector modulation are described. The synchronously rotating reference frame (SRRF) proportional-integral (PI) controller is used for output voltage control for stand-alone operation of inverter. The single-phase inverter with output LC filter in stand-alone mode controlled by only voltage control loop with the Flux Vector modulation is validated through laboratory experiments.

  • Three-Dimensional Flux Vector Modulation of Four-Leg Sine-Wave Output Inverters
    IEEE Transactions on Industrial Electronics, 2010
    Co-Authors: Dhaval C. Patel, Rajendra R. Sawant, Mukul C. Chandorkar
    Abstract:

    The time integral of the output voltage Vector of a three-phase inverter is often termed the inverter Flux Vector. This paper addresses the control of a three-phase four-leg sine-wave output inverter having an LC filter at its output, by controlling the Flux Vector in three dimensions. Flux Vector control has the property that an output filter resonance is actively damped by an output voltage control loop alone. Furthermore, an inverter switching action inherently regulates the output voltage rapidly against dc-bus voltage variations. The Flux Vector control of sine-wave output inverters finds several applications in three-phase four-wire systems. This paper presents a Flux modulation method for three-phase four-leg inverters feeding unbalanced and nonlinear loads. All the necessary steps for the digital implementation of the Flux modulator are presented. The switching behavior of the modulator has been evaluated, which is useful for the variable fundamental frequency applications of the inverters. To provide experimental validation, the modulator is implemented as a part of the control system for a stand-alone three-phase four-leg inverter with an LC filter at its output. Control system details are also provided. Experimental results indicate the effectiveness of the modulator and control system in providing balanced voltages at the output of the LC filter even under highly unbalanced conditions with nonlinear loads. The resonance damping and voltage regulation properties of the modulator are also apparent from the experimental results.

  • Control of four-leg sinewave output inverter using Flux Vector modulation
    2008 34th Annual Conference of IEEE Industrial Electronics, 2008
    Co-Authors: Dhaval C. Patel, Rajendra R. Sawant, Mukul C. Chandorkar
    Abstract:

    The time-integral of the output voltage Vector of a three-phase inverter is often termed as the inverter Flux Vector. This paper addresses the control of a three-phase four-leg sinewave output inverter having an LC filter at its output, by controlling the Flux Vector in three dimensions. Flux Vector control has the property that the output filter resonance is actively damped by the output voltage control loop alone. Further, the inverter switching action inherently regulates the output voltage rapidly against dc bus voltage variations. Flux Vector control of sinewave output inverters finds several applications in three-phase four-wire systems. This paper presents the Flux modulation method for three-phase four-leg inverters feeding unbalanced and nonlinear loads. All the necessary steps for the digital implementation of the Flux modulator are presented. To provide experimental validation, the modulator is implemented as part of the control system for a stand-alone three-phase four-leg inverter with an LC filter at its output. Control system details are also provided. Experimental results indicate the effectiveness of the modulator and the control system in providing balanced voltages at the output of the LC filter even under highly unbalanced conditions with nonlinear loads. The resonance damping and voltage regulation properties of the modulator are also apparent from the experimental results.

Jun Zhang - One of the best experts on this subject based on the ideXlab platform.

  • a direct Flux Vector controlled induction generator with space Vector modulation for integrated starter alternator
    IEEE Transactions on Industrial Electronics, 2007
    Co-Authors: Jun Zhang, M.f. Rahman
    Abstract:

    A direct-Flux-Vector-controlled scheme of induction generator has been proposed in this paper for future 42-V automobile application. The fundamental relationship between the rotating speed of the stator Flux Vector and torque is analyzed. A simple structure with only one proportional-integral (PI) controller is shown to implement the torque and Flux controls adequately. By controlling the electromagnetic torque of the induction machine, the required dc-bus voltage can be well regulated within the 42-V PowerNet specifications. Fixed switching frequency and low torque ripple are obtained with space-Vector modulation technique. Simulation and experimental results indicate that the proposed scheme provides a practical solution for an integrated starter alternator other than the widely applied field-oriented- control scheme.

  • Direct Flux Vector control scheme for induction machine drives with space Vector modulation
    Fourtieth IAS Annual Meeting. Conference Record of the 2005 Industry Applications Conference 2005., 2005
    Co-Authors: Jun Zhang, M.f. Rahman
    Abstract:

    In this paper, an improved torque controller of induction machine based on direct control of stator Flux linkage Vector is presented. The fundamental relationship between the rotating speed of the stator Flux linkage and torque is analyzed and the design principle of controller is presented. A simple structure with only one proportional-integral (PI) controller is shown to implement the torque and Flux control adequately. Parameters of PI regulator are easily found in the proposed design principle. Robust design of the direct Flux Vector ensures the system is not sensitive to the variation of rotor resistance. Fixed switching frequency and low torque ripple are obtained with PI control and space Vector modulation (SVM) method. Satisfactory modeling results indicate the feasibility of the proposed direct Flux Vector control scheme.