Kinnares, Vijit

Preferred name

Kinnares, Vijit

Alternative Name

Kinnares, V.

Main Affiliation

School of Engineering

vijit.ki@kmitl.ac.th

Now showing 1 - 10 of 70

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Investigation of skew effect on the behavior and performance of grid connected induction generators
(2017-01-30)
Sawetsakulanond, B.
;
Kinnares, V.
This paper proposes the investigation of skew effect on the behavior and performance of three phase, 2.2 kW, 220/380 V, Δ / Y connected, 1420 rpm, 4 poles grid connected induction generators with skewed squirrel cage rotor for supplying electric power to utility grid. Skewed rotor with angle of 0°, 5° and 10° for grid connected induction generators are employed. Analysis and comparative study on operating of induction generators under transient and steady state conditions have been performed. Research results will be guidelines for an application of wind induction generator for electricity generation.
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Performance improvement of a slip energy recovery drive system by a voltage-controlled technique
(2010-10-01)
Tunyasrirut, Satean
;
Kinnares, Vijit
;
Ngamwiwit, Jongkol
This paper introduces the performance improvement of a slip energy recovery drive system for the speed control of a wound rotor induction motor by a voltage-controlled technique. The slip energy occurred in the rotor circuit is transferred back to ac mains supply through a reactor instead of a step up transformer. The objective of the voltage-controlled technique is to increase power factor of the system and to reduce low order harmonics of the input line current. The drive system is designed and implemented using a voltage source inverter in conjunction with a boost chopper for DC link voltage, instead of a conventional drive using a 6 pulse converter or a Scherbius system. The slip power is recovered by the help of a voltage source inverter (VSI) based on a space vector pulse width modulation (SVPWM) technique. In order to keep the speed of the wound rotor induction motor constant over a certain range of operating conditions, the servo state feedback controller designed by a linear quadratic regulator (LQR) is also introduced in this paper. The overall control system is implemented on DSP, DS1104'TMS320F240 controller board. The performance improvement of the proposed system is tested in comparison with the conventional Scherbius system and the modified conventional Scherbius system by a 12 pulse converter in conjunction with a chopper at steady state and at dynamic conditions. A 220 W wound motor is employed for testing. It is found that the motor speed can be controlled to be constant in the operating range of 450-1200 rpm at no load and full load. It is also found that the efficiency of the proposed system is remarkably increased since the harmonics of the input ac line current is reduced while the ac line input power factor is increased. © 2010 Elsevier Ltd.
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Control of a converter system for an asymmetrical parameter type two-phase induction motor drive operating in motoring and generating modes
(2018-02-17)
Sardyoung, Papol
;
Kinnares, Vijit
The control of a converter system is presented and discussed for an asymmetrical parameter type two-phase induction machine drive that is operating in motoring and generating modes. The proposed system consists of back-to-back voltage source converters. For a machine side, a three-leg voltage source converter provides both unbalanced and balanced two-phase output voltages with a scalar V/F control based on a carrier space vector pulse width modulation (SVPWM) technique. For a front end, a single-phase AC/DC doubled voltage converter with hysteresis current control is used to keep DC-link voltage constant, thus resulting in a bi-directional power flow operation for the motoring and generating modes. A closed-loop design for the DC-link voltage is fully given and also included is a review of carrier-based SVPWM for two-phase three-leg VSI. The proposed drive system was both simulated using MATLAB/SIMULINK and implemented on digital microcontrollers. The comparative performance evaluation of the whole system between balanced and unbalanced two-phase voltages for the machine is given. The simulation and experimental results show that the unbalanced phase voltage offers better performance for the whole system.
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Five-leg voltage source inverter for driving two single-phase induction motors
(2014-01-01)
Dangeam, Sirichai
;
Kinnares, Vijit
This paper presents the simulation of a five-leg voltage source inverter for driving independently two single-phase induction motors with different speeds. Carrier-based space vector pulse width modulation is used for the five-leg VSI. V/f scalar control is employed for those motors. The simulation results show that the speed for each motor can be independently control. Besides that, the advantages of the five-leg inverter are shared capacitor and dc bus together, reduced cost due to a decrease in power switch count and driver circuits and also switching losses.
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Two-phase three-leg voltage source converter fed asymmetrical parameter type two-phase induction machine operating in motoring and generating modes
(2013-01-01)
Sardyoung, Papol
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Leeragreephol, Surachat
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Kinnares, Vijit
This paper presents performance evaluation of an asymmetrical parameter type two-phase induction machine drive using two-phase three-leg voltage source converter (VSC) operating in motoring and generating modes. A system is simulated using MATLAB/SIMULINK. The proposed converter system includes a machine side converter using a three-leg VSC and a front end converter using a single-phase full bridge switched mode converter. The overall converter system is able to operate in a bidirectional power flow mode. For the front end converter, hysteresis band current control is utilized to maintain the DC link voltage constant. The machine side converter provides both unbalanced and balanced twophase output voltages for the machine based on a sinusoidal pulse-width modulation (SPWM) technique. The comparative performance evaluation of the whole system between balanced and unbalanced two-phase motor voltages is given.
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Performance comparison of an asymmetrical parameter type two-phase induction motor supplied with balanced and unbalanced phase voltages
(2010-07-30)
Piyarat, W.
;
Hothongkham, P.
;
Kinnares, V.
This paper presents a performance comparison of an asymmetrical parameter type two-phase induction motor supplied with balabced and unbalanced phase voltages using a three-leg voltage source inverter (VSI). Sinusoidal pulse width modulation(SPWM) method with constant V/F control is used for the two phase three leg inverter. Simulation and experimemtal results are used to evaluate the motor performance. It is found that the unbalanced applied voltage case offers the better motor perfoemance over the balanced applied voltage case in terms of torque ripple, speed holding capability and current trajectories, etc.
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Performance evaluation of single-phase PWM AC chopper fed three-phase induction motor
(2014-01-01)
Phiphitsunthon, Benyathip
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Bumroongphuck, Chavaporn
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Promkhun, Watcharin
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Kinnares, Vijit
This paper presents performance evaluation of a single-phase AC chopper fed three phase induction motor. The existing three-phase induction motor connected in delta can be operated with such single-phase voltage controller by connecting a capacitor across one phase. By varying duty cycle of asynchronous PWM generated from a dsPIC microcontroller for a single-phase AC chopper, terminal motor voltage can be adjusted. Performance evaluation in terms of motor input power factor and efficiency has been performed. In addition, comparison between the proposed technique and both fixed voltage of 1-phase sinusoidal ac source and fixed voltage of conventional three-phase ac source is also given.
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Analysis and investigation on the behavior and performance of single phase grid connected induction generators system
(2017-10-02)
Nuttapong, P.
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Sawetsakulanond, B.
;
Kinnares, V.
This paper presents an inrush current reduction method for a 1/2 HP (0.4 kW), 220 V, 4.8 A, 4 poles single phase split-phase type induction generator when connected to a grid using single-phase voltage control with power electronic equipment. A study and analysis of relationship between voltage, current and real power by laboratory tests under direct on line and soft connection conditions are given. Simulation and experimental results are in good agreement. According to testing results, it is found that the proposed voltage control is able to reduce 75-80 % of the inrush current when starting the connection. Research results will be guidelines in applications of effective single-phase induction generators for wind energy.
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Active power control of single-phase grid-connected system supplying nonlinear load
(2013-12-01)
Liengpradis, P.
;
Kinnares, V.
This paper presents active power control or real power of single-phase grid-connected system supplying nonlinear load. The control method employs the reference current calculation combining the required real component of the grid current derived from required active power transfer to the grid and required harmonic current for harmonic elimination associated with the nonlinear load. With this method, power of any type of renewable energy can be transferred to the nonlinear load and the grid, the grid current is nearly sinusoidal, the reactive power of the nonlinear load can be compensated and the power factor is always nearly unity. The simulation results verify the correctness of operation for the proposed functions using MATLAB/Simulink. © 2013 IEEE.
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PV powered three-leg VSI fed asymmetrical parameter type two-phase induction motor
(2014-01-01)
Hayakwong, Ekkawid
;
Kinnares, Vijit
Utilization of renewable energy has increased spectacularly in recent years, with the high energy demand and fast decaying of fossil fuels. Renewable energy, especially solar energy has been the power choice for many applications such as solar powered induction motor drive. For that reason, this paper aims to propose an open loop speed control method for achieving high performance over a wide range of operating speeds. The proposed induction motor drives are supplied by a solar power system which consists of two-stages of power conversion; DC-DC boost converter with maximum power point tracker (MPPT) for the first stage and DC-AC three-leg voltage source inverter supplying a two-phase induction motor load for the second stage. A modulation strategy is developed to supply unbalanced two-phase output voltage based on the carrier-based space vector PWM (SVPWM) with open-loop V/F control. The performance characteristics of the induction motor with the proposed method are determined by two modulation strategies namely balanced and unbalanced SVPWM. The validity of the proposed method is verified by simulation results.

Kinnares, Vijit

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