Kinnares, Vijit

Preferred name

Kinnares, Vijit

Alternative Name

Kinnares, V.

Main Affiliation

School of Engineering

vijit.ki@kmitl.ac.th

Now showing 1 - 5 of 5

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Power Quality Improvement of a Grid Connected Spilt-Phase Induction Generator using Tuned Harmonic Filters and Reactive Power Compensation
(2022-01-01)
Prapurt, Nuttapong
;
Kinnares, Vijit
This paper proposes power quality improvement of a 0.40 kW, 220V, 4.S0A, 4 pole grid connected split-phase induction generator using a capacitor for reactive power compensation in conjunction with the third and fifth tuned harmonic filters for mitigation of grid harmonic currents associated with the capacitor for reactive compensation. The design of the shunt passive filters is given. The obtained results can be guidelines for the design of a suitable induction generator system for efficient wind energy applications.
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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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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.
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Soft Starting Comparison of Single-Phase Capacitor Start Capacitor Run Induction Machine Between Motoring and Generating Operation Using Asynchronous PWM AC Chopper
(2024-01-01)
Prapurt, Nuttapong
;
Kinnares, Vijit
;
Boontua, Sakdawut
This paper presents a soft starting comparison of a single-phase, 1 hp, 220 V, 4.8 A, four-pole capacitor-start capacitor-run induction machine between motoring and generating mode of operation when connected to a grid using single-phase PWM AC chopper. An asynchronous PWM strategy is used for controlling the machine voltage with the AC chopper during soft start with a reason of simplicity. The PWM AC chopper offers some advantages over a conventional ac voltage controller using phase control in terms of harmonic reduction and linear relationship between fundamental voltage and duty ratio. The comparison of waveforms of starting currents, voltages, instantaneous power under direct on line and soft connection conditions is given when the machine operates as a generator and a motor during startup. According to experimental results, it is found that when starting the connection, the generator offers lower starting current compared to the motor and the soft starter can reduce starting current to one fifth when compared to direct on line start.
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Single-Phase Grid Connected Induction Generator with Soft Starting and Power Quality Improvement
(2022-01-01)
Prapurt, Nuttapong
;
Kinnares, Vijit
This paper proposes a soft starting method and power quality improvement of a single-phase grid connected induction generator using a phase control thyristor converter and a active filter. The SCR soft starter is used to reduce inrush current and severe electromagnetic oscillation of the generator during startup. The shunt active filter with simple control scheme is introduced for the solution not only harmonic problem associated with the soft starter and nonlinear loads in conjunction with the system but also reactive power drawn by the generator. As a consequence the grid current waveform is close to sinusoidal and the grid power factor is near unity. Investigation and discussion of the system performance by simulation results are given.

Kinnares, Vijit

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