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Author: search.filters.author.Promkhun, WatcharinStart date: 2020

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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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    Discontinuous Space Vector Pulse Width Modulator for a Two-Phase Three-Leg Inverter Using Analog Circuits
    (2025-01-01)
    Promkhun, Watcharin
    ;
    Kinnares, Vijit
    ;
    Prapurt, Nuttapong
    ;
    Auyaisom, Nopporn
    This paper proposes a carrier-based Discontinuous Space Vector Pulse Width Modulation Technique (DSVPWM) using analog circuits for a two-phase three-leg Voltage Source Inverter (VSI) providing balanced and unbalanced output phase voltages. The aim of this technique is to reduce the number of commutation in a fundamental period resulting in a reduction in switching loss, electromagnetic interference and stress of devices. The analog circuit implementation of Space Vector Pulse Width Modulation (SVPWM) is based on mathematical expressions. Unlike a digital technique in modulation, a sinusoidally modulating signal is naturally compared with a triangular carrier for the analog technique without sampling. As a consequence the harmonic distortion of the load current is reduced particularly for low switching frequency. Also, with this technique, very high switching frequency is possible due to inherently wide bandwidth characteristics of the circuits. Apart from the hardware implementation, the simulation using MATLAB/Simulink has also been conducted to confirm the validity of the proposed technique. Additionally the proposed analog modulator is applied to a two-phase three-leg VSI for performance testing under various operating conditions in order to evaluate inverter losses associated with both continuous and discontinuous types of SVPWM. The simulation and experimental results illustrate that the discontinuous modulation technique is able to decrease the inverter losses and gives approximately up to 3 percent higher efficiency of the system when compared to the conventional continuous one.