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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
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Kinnares, Vijit
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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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An Adaptive Data-Driven-Based Control for Voltage Control Loop of Grid-Forming Converters in Variable Inertia MGs
(2024-01-01)
Pinthurat, Watcharakorn
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Kongsuk, Prayad
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Surinkaew, Tossaporn
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Marungsri, Boonruang
In the transition towards sustainable energy systems, microgrid (MG) plays a pivotal role, especially in the context of variable-inertia MGs that integrate renewable energy sources (RESs) and distributed energy resources (DERs). Maintaining stable voltage control within such grids is imperative for reliable operation. This paper presents an adaptive data-driven control technique for the voltage control loop of grid-forming converters in variable-inertia MGs. The primary objective is to enhance control performance while accommodating the unpredictable nature of renewable energy sources. The approach utilizes advanced data-driven algorithms to continuously monitor and adjust control parameters based on real-time grid conditions. This adaptability allows for effective management of varying inertia and load demand, ensuring optimal grid performance. The data-driven nature of the approach enables self-adaptability, making it suitable for the dynamic MG environment. This new approach is a noteworthy advancement in controlling RESs and DERs to maintain stable voltage in MGs, without needing precise knowledge of the MG's parameters. Simulation tests and real-world examples confirm that the adaptive data-driven control method effectively optimizes voltage control in MGs with variable inertia, especially those with a high presence of RESs and DERs.
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Cascaded H-Bridge Multilevel Inverter with Reactive-Power Compensation for Single-Phase Grid-Connected System
(2023-01-01)
Boontua, Sakdawut
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Jirasuwankul, Nirudh
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Kongsuk, Prayad
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Kinnares, Vijit
This paper presents the power factor compensation of a grid-connected system using a five-level cascaded H-bridge multilevel inverter (FCHMLI) supplying real power and reactive power (pq-power) to the grid system. The FCHMLI output power is controlled using a vector control based on the dq-axis synchronous reference frame technique. This methodology can control the pq-power between the FCHMLI and the grid system that can inject or absorb independently. The real power and reactive power can be controlled independently with d-axis and q-axis currents, respectively. The grid system is connected with the resistive and inductive loads that provide the lagging of grid power factor. The proposed technique has been simulated by MATLAB/Simulink program in order to verify the correctness of the proposed control scheme. The simulation results are found the FCHMLI can inject not only real power but also the reactive power to improve the grid power factor associated with linear loads resulting in near unity power factor.
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Cascaded H-bridge multilevel inverter for induction motor drive with improved grid current quality
(2021-05-19)
Kongsuk, Prayad
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Boontua, Sakdawut
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Kinnares, Vijit
;
Boonseng, Jongrak
This paper presents the implementation of a drive system using a cascaded H-bridge multilevel inverter and multi pulse rectifier for grid current quality improvement. A 5-level inverter is controlled by using a carrier based sinusoidal PWM signals technique implemented on a C2000 microcontroller. A front end converter has grid current quality improvement by applying twelve-pulse rectifiers based on phase-shifting transformers to reduce lower order current harmonics which could be injected into power supply grid. The proposed system has been tested for driving a three-phase induction motor. The obtained results verify that the proposed system is able to drive the induction motor as well as a reduction in the distortion of the grid current which are satisfactory.
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Five-level cascaded multilevel H-Bridge inverter for single-phase PV grid-connected system
(2021-05-19)
Boontua, Sakdawut
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Kongsuk, Prayad
;
Kinnares, Vijit
This research presents the applied PO MPPT control technique for controlling real power and reactive power (PQ) of a single-phase five-level H-bridge multilevel inverter for a PV grid-connected system (FHB-MLI for PVGCS) under weak irradiation condition. Perturb and Observe (PO) maximum power point tracking (MPPT) technique is used in this system to keep dc-link voltage constant for maximum power to be maintained for each module. The proposed controller regulates the actual dc-link voltage independent of each other under imbalance of power irradiation of each PV and varies real power and reactive power with magnitude and power angle of grid-current. The validation of the proposed method is verified by simulation using MATLAB/SIMULINK program and promising experiment. Simulation results, with a setup consisting of real power and reactive power processing by weak irradiation condition and two PV modules, indicate that the overall system can operate satisfactorily even in conditions with different irradiation of the modules injecting available maximum power to the grid.
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Performance evaluation of three-leg voltage source inverter fed unsymmetrical two-phase induction motor based on genetic algorithm for parameter estimation
(2019-12-01)
Kongsuk, Prayad
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Kinnares, Vijit
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Phumiphak, Phunyaphat
This paper presents an evaluation method of performance characteristics in terms of loss, currents and electromagnetic torque of an unsymmetrical two-phase induction motor driven by a three-leg Voltage Source Inverter (VSI) providing unbalanced two-phase voltages. The model parameters for consideration of loss and dynamic performance of the motor are estimated by using Genetic Algorithm (GA). Also, synthesized winding current waveforms based on a super-position method and frequency domain of known harmonic voltages are investigated. The methodology of the proposed GA applied to parameter estimation of the unsymmetrical two-phase induction motor is fully given. Carrier-based unbalanced Space Vector Pulse With Modulation (SVPWM) is employed and implemented on a low-cost microcontroller. In order to prove the validity of the model with the parameters obtained by GA, performance comparison with the experiment and the model with the parameters obtained by conventional test in laboratory has been made. The results of simulation with the proposed parameters and experiment are in good agreement.
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Loss modeling of three-leg voltage source inverter fed asymmetrical two-phase induction motor
(2016-01-18)
Kongsuk, Prayad
;
Kinnares, Vijit
This paper presents loss modeling of an asymmetrical two-phase induction motor driven by a three-leg voltage source inverter (VSI) providing unbalanced space vector PWM output voltages. The model parameters are estimated by using a set of measured data obtained from actual motor in conjunction with the genetic algorithms. In order to prove the validity of the loss model, comparison between measured and calculated main and auxiliary winding current waveforms is given by using a superposition method of the equivalent circuit with known fundamental and harmonic voltages of PWM output. Also, experimental loss results are compared with the calculated ones under various conditions. The results show that simulation and experimental results are in good agreement.
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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
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Promkhun, Watcharin
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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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