Kinnares, Vijit

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Kinnares, Vijit
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Kinnares, V.
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vijit.ki@kmitl.ac.th

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    Performance Improvement of Vector Control Based Unsymmetrical Two-Phase Induction Generator with Optimum Voltage Compensation
    (2024-01-01)
    Choorak, Chaiwut
    ;
    Kinnares, Vijit
    ;
    Bumroongphuck, Chavaporn
    ;
    Prapurt, Nuttapong
    This paper presents performance improvement with optimum voltage compensation of a vector control based unsymmetrical Two-Phase squirrel cage Induction Generator (TPIG) with closed loop speed control using carrier-based space vector pulse width modulation. Indirect Field-Oriented Control (IFOC) of the induction generator is used to achieve fast response and good accuracy. The proposed system consists of a two stage AC-DC-AC link equipped with bidirectional power flow between the machine and the single-phase grid. The DC link voltage is kept constant at the reference value by using hysteresis current control of the grid side converter resulting in rectification and inversion modes of operation with high-power factor and nearly sinusoidal current waveform. A Carrier-Based Space Vector Modulation (CBSVPWM) technique is used for controlling a two-phase three-leg voltage source converter providing balanced and unbalanced voltages with an optimum value of voltage compensation. The experimental results show that the system performance for unbalanced supplied voltages with the optimum value of the compensation of the machine is better than that for balanced supplied voltages in terms of power transfer to the grid, electromagnetic torque pulsation and speed ripple.
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    Performance analysis of a modified three-phase induction motor with optimal capacitance fed by single-phase ac supply
    (2020-01-01)
    Bumroongphuck, Chavaporn
    ;
    Kinnares, Vijit
    This paper proposes a performance analysis of a modified three-phase induction motor with optimal capacitance operating with a singlephase mains supply. The modified three-phase motor is described and analyzed. Based on analytical equations, calculation of optimal capacitance to minimize voltage unbalance and torque pulsations is performed. Moreover positive and negative components of voltages are revealed. A d-q-0 reference frame for dynamic performance analysis is used to investigate flux linkages and electromagnetic torque. The validity of the optimal capacitance is confirmed by experimental results, showing that the motor has the least voltage unbalance and the highest efficiency compared with other non-optimal capacitances. The experimental and simulation results are in good agreement.
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    Soft Starting of a Modified Three-Phase Induction Motor with a Single-Phase Synchronous PWM AC Chopper
    (2025-01-01)
    Bumroongphuck, Chavaporn
    ;
    Koodsamrong, Rangsan
    ;
    Kinnares, Vijit
    This paper presents a soft starting method for a modified three-phase induction motor using a single-phase synchronous PWM AC chopper to reduce starting current and electromagnetic torque pulsation. The modified motor functions as a single-phase induction motor due to the lack of a three-phase source and employs an appropriate capacitor. The synchronous single-phase PWM AC chopper provides several benefits over traditional thyristor soft starters, including a linear relationship between fundamental voltage and modulation index, improved voltage control, and lower harmonic currents. A cost-effective microcontroller gradually increases the duty cycle to create PWM signals for soft starting, achieving nearly a 65% reduction in starting current compared to direct online starting. Simulation and experimental results confirm enhanced starting performance, making it suitable for applications such as water and air pumps.