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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.
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Optimal Zero-Sequence Selection for Five-Leg Inverter Based on Two-Phase SVPWM Fed Dual Two-Phase Induction Motors
(2018-07-02)
Promkhun, Watcharin
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Kinnares, Vijit
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Ohyama, Kazuhiro
;
Thanyaphirak, Veera
This paper presents an optimal zero-sequence selection based on two-phase space vector pulse width modulation for five-leg inverter fed dual two-phase induction motors. The proposed zero-sequence selection of common b is determined which can reduce the peaks of resultant duty cycle before overmodulation resulting in an extension of a linear range of modulation index. As a result, the proposed strategy offers better DC-bus utilization when compared to a conventional strategy for a five-leg voltage source inverter.
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Vector control system for asymmetrical two-phase induction motor drives
(2016-01-18)
Rujidam, Navee
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Promkhun, Watcharin
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Chaiyot, Rungwicha
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Kinnares, Vijit
This paper presents a drive system of asymmetrical two - phase induction motors (TPIMS), which is able to operate in four quadrants. A front end converter connected with grid allows bidirectional power flow for rectification and inversion modes based on vector control to keep dc link voltage constant. A machine side converter uses a three - leg voltage source inverter based on a space vector pulse width modulation technique. The control strategy is based on indirect field oriented control for good dynamic response. The proposed system is simulated by Matlab/Simulink. Simulation results show that the proposed system is able to operate in four quadrants and torque performance is good. Grid current waveform is close to sinusoidal and grid power factor is nearly unity. In a braking condition the system allows power flow to grid for energy saving.
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Speed control of an asymmetrical type two-phase induction motor using discontinuous space vector pulse width modulation
(2016-01-18)
Promkhun, Watcharin
;
Kinnares, Vijit
This paper presents a speed control technique of an asymmetrical two-phase induction motor using a three-leg voltage source inverter with discontinuous space vector pulse width modulation (DSVPWM) technique. This proposed constant speed control uses slip frequency control and constant V/f techniques. The proposed DSVPWM can reduce switching losses of the motor side inverter. Single-phase full bridge switched-mode converter is used to improve power quality and allow regenerative power to grid. Design of the closed loop control of the system is fully given. This system is simulated by MATLAB/Simulink. The results of the motor side show quick response and good performance for the two-phase induction motor control in both steady and dynamic responses.
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Single-phase AC/DC/AC converter system for a grid-connected asymmetrical parameter type two-phase induction generator
(2015-01-26)
Sardyoung, Papol
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Promkhun, Watcharin
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Kinnares, Vijit
This paper proposes a single-phase AC/DC/AC converter system for a grid-connected asymmetrical parameter type two-phase induction generator. For the front end converter, variable hysteresis band current controller is utilized to maintain DC link voltage constant and to allow bidirectional power flow. For the machine side, a carrier-based space vector pulse width modulation technique is used for controlling the three-leg voltage source converter providing variable voltage and variable frequency. The proposed drive system is simulated using MATLAB/SIMULINK. Comparative performance evaluation under unbalanced and balanced phase voltage of the induction generator and various speeds is given.
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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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Measured loss evaluation of asymmetrical parameter type two-phase induction motor supplied with a three-leg voltage source inverter
(2014-01-01)
Kongsuk, Prayad
;
Promkhun, Watcharin
;
Kinnares, Vijit
This paper presents the measured power losses of asymmetrical parameter type Two-Phase Induction Motor supplied with three-leg voltage source inverter. The comparison of the motor losses between balanced and unbalanced voltages supplied to both windings of the two-phase induction motor under variation of voltages at various inverter frequencies and various loads is given. A dSPIC microcontroller is employed to generate space vector pulse width modulation signals with switching frequency of 5 kHz for the two-phase three-leg VSI. The experimental results are shown that an unbalanced phase voltage case give lower losses than a balanced phase voltage case at the same modulation index, frequency and load. When decreasing main voltage winding from the rated value for both cases, there are minimum values of losses for each load torque value.

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