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Subject: search.filters.subject.space vector pulse width modulation

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    Discontinuous SVPWM-Based Speed Control of Unsymmetrical Two-Phase Induction Motor Using a Multifunctional Drive System
    (2026-01-01)
    Promkhun, Watcharin
    ;
    Kinnares, Vijit
    ;
    Kongsuk, Prayad
    ;
    Piyarat, Wekin
    ;
    Dangeam, Sirichai
    This paper proposes a multifunctional drive system for closed loop speed control of an unsymmetrical two-phase induction motor. A two-phase three-leg voltage source inverter providing constant Volts/Hz and slip regulation control for a machine end converter employs time-based discontinuous space vector pulse width modulation in order to reduce switching loss. A hysteresis current control technique of a single-phase full bridge regenerative PWM rectifier as a front-end converter utilizes source current as a feedback signal instead of converter current. The front-end converter offers multi-functionality of not only bidirectional real power flow but also acting as an active power filter responsible for reactive power and harmonic compensations for various types of nonlinear loads in conjunction with the drive system. As a result, the grid current waveform is nearly sinusoidal and the grid power factor is near unity power factor. With the proposed discontinuous unbalanced space vector pulse width modulation (DUSVPWM) method, the two-phase three-leg inverter provides optimum unbalanced two-phase voltages with orthogonal displacement appropriate for the unsymmetrical two-phase induction motor which is able to improve the converter efficiency. The overall control system is implemented on a low-cost DSP board. The validity of the proposed system is verified by both simulation and experimental results. The capability of the drive under various conditions is satisfactory.
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    High Performance Unsymmetrical Two-Phase Induction Motor Drive with Direct Torque Control Based on Unbalanced SVPWM Technique
    (2024-01-01)
    Piyarat, Wekin
    ;
    Kinnares, Vijit
    This paper proposes a high performance unsymmetrical two-phase induction motor drive using unbalanced space vector pulse-width modulation based direct torque control (USVPWM-DTC). The merit of this technique is that both electromagnetic torque and flux are directly controlled without redundancy of the current loop control. A stator flux oriented reference frame is used. PWM signals are generated on the basis of reference voltage vectors. With optimum unbalanced winding voltages, the proposed USVPWM-DTC can overcome a torque pulsation problem resulting from unbalanced parameters of both windings of the motor. Unlike a conventional look up table voltage vector method, the proposed method offers constant switching frequency over a wide range of operating frequency. As a consequence, it is able to cope with several problems such as a stator flux droop problem during sector transition, high current and torque ripple and high noise level. The magnitude of the stator flux is kept constant under various operating conditions and its ripple can also be reduced resulting in performance improvement. The overall drive system is implemented on a real - time DSP TMS320F240 board via dSPACE DS1104 interface card. Furthermore, the proposed system offers more or less fifty percent faster response and almost eighty percent lower torque ripple of electromagnetic torque when compared to a balanced two-phase output space vector pulse width modulation (BSVPWM-DTC) strategy. Experimental results of a 370 W unsymmetrical two-phase induction motor drive under various conditions, such as four quadrant operation, stator flux trajectory, and harmonic spectrum, are presented to demonstrate the viability of the proposed technique which are satisfactory.
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    Single-phase AC/DC/AC converter system for a grid-connected asymmetrical parameter type two-phase induction generator
    (2015-01-26)
    Sardyoung, Papol
    ;
    Promkhun, Watcharin
    ;
    Kinnares, Vijit
    This paper proposes a single-phase AC/DC/AC converter system for a grid-connected asymmetrical parameter type two-phase induction generator. For the front end converter, variable hysteresis band current controller is utilized to maintain DC link voltage constant and to allow bidirectional power flow. For the machine side, a carrier-based space vector pulse width modulation technique is used for controlling the three-leg voltage source converter providing variable voltage and variable frequency. The proposed drive system is simulated using MATLAB/SIMULINK. Comparative performance evaluation under unbalanced and balanced phase voltage of the induction generator and various speeds is given.