Kinnares, Vijit

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Kinnares, Vijit
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Kinnares, V.
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vijit.ki@kmitl.ac.th

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    Five-level cascaded multilevel H-Bridge inverter for single-phase PV grid-connected system
    (2021-05-19)
    Boontua, Sakdawut
    ;
    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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    Cascaded H-Bridge Multilevel Inverter with Reactive-Power Compensation for Single-Phase Grid-Connected System
    (2023-01-01)
    Boontua, Sakdawut
    ;
    Jirasuwankul, Nirudh
    ;
    Kongsuk, Prayad
    ;
    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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    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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    Cascaded H-bridge multilevel inverter for induction motor drive with improved grid current quality
    (2021-05-19)
    Kongsuk, Prayad
    ;
    Boontua, Sakdawut
    ;
    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.