Kinnares, Vijit

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Modulating functions of space vector PWM for three-leg VSI-fed unbalanced two-phase induction motors
(2009-02-10)
Kinnares, Vijit
;
Charumit, Chakrapong
Modulating functions or space-vector-equivalent references of a carrier-based unbalanced two-phase output space vector pulsewidth modulation (SVPWM) strategy applied to a three-leg voltage source inverter are proposed in this letter. These functions are derived from a conventional balanced two-phase SVPWM method. The proposed SVPWM method is implemented using a DS1104 dSPACE controller board. With the proposed method, the appropriate voltages for both windings of an asymmetrical-parameter-type two-phase induction motor can be achieved for improving the motor performance. Experimental and calculated results confirm the validity of the proposed method. © 2009 IEEE.
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Realization of a carrier-based unbalanced output space vector PWM strategy using analogue and digital techniques for three-leg voltage source inverter fed two-phase induction motors
(2009-01-01)
Charumit, Chakrapong
;
Kinnares, Vijit
This paper proposes the realization of a carrier-based space vector pulsewidth modulation (SVPWM) method using analogue and digital techniques. This PWM method provides unbalanced phase outputs for a two-phase three-leg voltage source inverter (VSI). The principle is fully described. The proposed space vector equivalent phase leg reference voltages are derived from conventional ones. With the proposed SVPWM method, the amplitude of the unbalanced phase voltages can be easily controlled as required whilst the phase difference angle is kept at 90 degrees. This characteristic is suitable for a control method of an asymmetrical type two-phase induction motor. The validity of the proposed method is verified by both calculated and experimental results under a variation of PWM parameters with resistive-inductive and motor loads in terms of space vector equivalent reference waveforms, current waveforms and space vector trajectories and so on. © 2009 The Institute of Electrical Engineers of Japan.
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Analogue space vector modulator for two-phase loads using a three-leg voltage source inverter
(2008-01-01)
Charumit, Chakrapong
;
Kinnares, Vijit
This paper proposes implementation of a carrierbased space vector pulse width modulation (SVPWM) strategy through an analogue method for a three-leg voltage source inverter (VSI) providing both balanced and unbalanced twophase outputs. The phase difference angle of output voltages is kept at 90 degrees whilst the amplitude is adjustable. The mathematical approach to a waveform synthesis is proposed. The circuit design in accordance with mathematical equations of the analogue modulator is given. The correctness of the proposed method is verified by both simulated and experimental results. © 2008 IEEE.
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Discontinuous SVPWM techniques of three-leg VSI-fed balanced two-phase loads for reduced switching losses and current ripple
(2015-04-01)
Charumit, Chakrapong
;
Kinnares, Vijit
In this paper, various types of discontinuous space vector pulse-width modulation techniques for a three-leg voltage source inverter supplying balanced two-phase loads are proposed. The main objectives of the paper are to analyze switching loss characteristics associated with semiconductor devices and to reduce output current ripple by dealing with various types of zero space vector time in each switching sequence. Capabilities of reductions in switching losses and current ripple for both balanced and unbalanced output phase voltages at high modulation index and load power factor angle of 30° lagging are focused. The validity of the proposed techniques is verified by simulation and experimental results in terms of voltage spectrum, current waveforms, reductions in switching losses, and output current ripple at high modulation index when compared to a continuous space vector pulse-width modulation technique.
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Control of a 3-phase 4 wire grid connected converter with active power filter and var compensation functionality for nonlinear loads
(2012-12-01)
Prommeuan, Sakda
;
Kinnares, Vijit
;
Charumit, Chakrapong
This paper presents control of real power and reactive power together with active filter functionality of a grid connected voltage source converter for 3-phase, 4 wire system in order to eliminate harmonic currents associated with non-linear load in each phase. A classical instantaneous real and reactive power control method is used together with a harmonic elimination technique. A three-phase voltage source converter is used to control the reference current based on fixed hysteresis band current control. The active and reactive power are independently controlled whilst the grid current is compensated to be nearly sinusoidal waveform. The simulation results verify the correctness of operation for the proposed functions using MATLAB/Simulink. © 2012 IEEE.
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Control of a multifunctional 3-phase 4-wire grid connected converter using adaptive hysteresis current controller
(2014-01-01)
Prommeuan, Sakda
;
Kinnares, Vijit
;
Charumit, Chakrapong
This paper proposes control of a three-leg four-wire grid-connected converter with multifunction namely power transfer to grid and active power filter for nonlinear loads. Reference currents are calculated on the basis of the p-q theory for a power transfer function and derived from load currents for an active filter function. An adaptive hysteresis current controller is used for tracking the reference currents. As a consequence, the proposed system provides fast response and nearly constant switching frequency. The proposed system is verified by simulation using MATLAB/Simulink.

Kinnares, Vijit

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