Browsing by Author "Mushi, Aviti"

Now showing 1 - 7 of 7
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    Design for nonlinear current reference deadbeat control for boost converter
    (2017 IEEE 3rd International Future Energy Electronics Conference and ECCE Asia (IFEEC 2017 - ECCE Asia), 2017-07) Mushi, Aviti; Nagai, Sakahisa; Obara, Hidemine; Kawamura, Atsuo
    This paper describes a design for fast and robust nonlinear deadbeat control for boost DC–DC converters. Nonlinear current reference deadbeat control is derived based on nonlinear state equation of the converter. Load disturbance compensation is implemented thus forming a new robust nonlinear controller. Both experiments and simulations of boost converter with input 12 V, output 20 V, load 4 Ω and 100 kHz sampling frequency, confirmed the voltage command tracking capability 266 μs settling time, and also disturbance rejection 1.20 ms recovery time. The method is applicable to boost converters of various applications.
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    Fast and Robust Nonlinear Deadbeat Current Control for Boost Converter
    (Institute of Electrical Engineers of Japan, 2017-09) Mushi, Aviti; Nagai, Sakahisa; Obara, Hidemine; Kawamura, Atsuo
    This paper proposes a fast and robust nonlinear deadbeat control for boost DC–DC converters. First, the nonlinearstate equation is derived, and second a nonlinear current reference deadbeat control is proposed. Third, a new nonlin-ear controller to implement the load disturbance compensation is proposed. After the simulations and verification byexperiments, it was confirmed that under the conditions of an input voltage of 12 V, an output voltage of 20 V, a loadresistance of 4Ωand a sampling frequency of 100 kHz, the voltage command tracking capability of a settling time of280μs was achieved, and an output voltage recovery time of 1.46 ms was achieved for a sudden load change.
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    Nonlinear dead beat control for boost converter
    (IEEJ international workshop on Sensing, Actuation, Motion Control, and Optimization (SAMCON2016), 2016-03) Mushi, Aviti; Nagai, Sakahisa; Kawamura, Atsuo
    Digital control enable designing of fast responding controllers, useful in nonlinear control. This paper proposes a nonlinear dead beat controller for a boost converter. The controller utilizes the quick reference tracking in finite sampling periods of the dead beat control. Theoretical background is followed by simulations to verify the nonlinear dead beat control algorithm. The simulation is done using the power electronics simulation software (PSIM) on a boost converter rated at mid-range to high power levels. For the purposes of this research the converter was limited to supply a 100 W resistive load.
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    Proposal for faster disturbance rejection of boost DC-DC converter based on simplified current minor loop
    (IEEE, 2015-11-01) Mushi, Aviti; Nozaki, Takahiro; Atsuo, Kawamura
    Boost converters contain a right half plane (RHP) zero. This RHP has severe limitations on the bandwidth of controllers. Further, this RHP makes it difficult to design fast disturbance rejection approaches, such as disturbance observers (DOB). This paper tackles the problem of designing a DOB based control law of the boost converter. This is done by designing a dual loop feedback controller. The designed controller is called current-minor-loop (CML) control. With CML, it is possible to make a fast response of inductor current to track reference current. Following that, the CML can be reformulated such that the current loop is considered unity. Further, the CML is simplified to make the boost converter minimum phase (MP) system. The formulated control approach is validated by simulations using PSIM software. Then, this method is verified by experiments on a boost converter loaded with resistive load.
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    Proposal of nonlinear deadbeat control for boost converter and the experimental verification
    (Yokohama National University, 2017-09-30) Mushi, Aviti
    This thesis discusses the proposal of nonlinear deadbeat control for continuous conduction mode (CCM) boost converter and the experimental veri cation. First, the nonlinear state equation is derived, and second a nonlinear current reference deadbeat control is proposed. Third, a new nonlinear controller to implement the load disturbance compensation is proposed. After the simulations using PSIM software and veri cations by experiments, it was con rmed that under the conditions of an input voltage 12 V, an output voltage of 20 V, a load resistance of 4 and a sampling frequency of 100 kHz, the voltage command tracking capability of a settling time of 280 s was achieved, and an output voltage recovery time of 1:46 ms was achieved for a sudden unknown load change. Mathematical analysis was performed and con rmed asymptotic stability and robustness of the control method during voltage and current perturbation, disturbance occurrence and parameter variations. It was con rmed that the voltage and cur- rent errors eigen values converge towards inside of the unit circle thus maintaining asymptotic stability for each perturbation case investigated. Methods to design the controller parameters were stipulated to be within the physical realization and can be applied to boost converter of any application in CCM. The proposed control method was compared with other literature that applied di erent digital control methods to boost converters of various applications. It was found that nonlinear deadbeat control proposed in this thesis was about twice as fast for reference tracking response, and could reject disturbances quickly for a load current three times bigger than other literature. Therefore, it is concluded that these data are the best even though the proposed control is based on nonlinear equations. Few di erences were observed between experiments and simulations. Upon investigations, those di erences were found to be caused by time delay in the switching device and other un-modeled nonlinear switching device phenomena. Future work will be focused on improving the control method to compensate for those observed nonlinearities.
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    Proposal of nonlinear deadbeat control for boost converter and the experimental verification
    (Yokohama National University, 2017-09-30) Mushi, Aviti
    This thesis discusses the proposal of nonlinear deadbeat control for continuous conductionmode (CCM) boost converter and the experimental verification. First, the nonlinear state equa-tion is derived, and second a nonlinear current reference deadbeat control is proposed. Third,a new nonlinear controller to implement the load disturbance compensation is proposed. Afterthe simulations using PSIM software and verifications by experiments, it was confirmed thatunder the conditions of an input voltage 12 V, an output voltage of 20 V, a load resistance of 4Ω and a sampling frequency of 100 kHz, the voltage command tracking capability of a settlingtime of 280μs was achieved, and an output voltage recovery time of 1.46 ms was achieved fora sudden unknown load change. Mathematical analysis was performed and confirmed asymp-totic stability and robustness of the control method during voltage and current perturbation,disturbance occurrence and parameter variations. It was confirmed that the voltage and cur-rent errors eigen values converge towards inside of the unit circle thus maintaining asymptoticstability for each perturbation case investigated. Methods to design the controller parameterswere stipulated to be within the physical realization and can be applied to boost converterof any application in CCM. The proposed control method was compared with other literaturethat applied different digital control methods to boost converters of various applications. Itwas found that nonlinear deadbeat control proposed in this thesis was about twice as fast forreference tracking response, and could reject disturbances quickly for a load current three timesbigger than other literature. Therefore, it is concluded that these data are the best even thoughthe proposed control is based on nonlinear equations. Few differences were observed betweenexperiments and simulations. Upon investigations, those differences were found to be caused bytime delay in the switching device and other un-modeled nonlinear switching device phenomena.Future work will be focused on improving the control method to compensate for those observednonlinearities.
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    Research on overall efficiency improvement of electric vehicles by MTHDPAM control method
    (2012 15th International Power Electronics and Motion Control Conference (EPE/PEMC), 2012-01) Watanabe, Yuki; Kim, Tae-Woong; Mushi, Aviti; Kawamura, Atsuo
    In this paper, I propose the Minimum Total Harmonic Distortion Pulse Amplitude Modulation control method.This control method is beforehand calculating the switching pattern to minimize THD by adding a redundant pulse. This is attributed to increase of the motor iron loss depending on harmonic voltage.