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Author: search.filters.author.Khomfoi, SurinSubject: search.filters.subject.electric vehicle

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    Coordinated Control of Electric Vehicles and Renewable Energy Sources for Frequency Regulation in Microgrids
    (2020-01-01)
    Jampeethong, Phoompat
    ;
    Khomfoi, Surin
    A Control technique of electric vehicles (EVs) cooperating with ac microgrids is considered as an important role with integration of renewable energy sources (RES), i.e. wind and solar farms. As known, the intermittent power generations of these RESs can provide significant changes of the frequency in microgrids. Consequently, outputs of these generations are regarded as continuous disturbances. Previously, the ability to permit frequency stabilizing effect was usually neglected in microgrid design; thereupon, the performance of controller may be ineffective to regulate the frequency in such a microgrid. To address this problem, a new coordination of EV, wind farm (WF), and photovoltaic (PV) for microgrid frequency regulation is proposed in this article. In the control design, the proposed adaptive PI controller is developed by using practical proportional integral (PI) controllers. An effect of a small delay is also considered in input-output pairs of the adaptive PI controllers. Simulation model is developed for validating the proposed controller. Simulation results demonstrate that the proposed coordinated control technique of EVs, WF, and PV power generation provides a better frequency regulation performance than a fixed PI controller under various uncertainties such as wind and solar power fluctuations, N-1 outages, disconnection of RESs, load variations, and the number of EVs.
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    A pulse frequency technique for a quick charger
    (2013-09-02)
    Praisuwanna, Chetnaphat
    ;
    Khomfoi, Surin
    The half bridge modular converter configuration is used to perform the charging pulses with both positive and negative pulse. The positive pulse charge permits the high peak current charge which leads to quick charging mode. The negative pulse and idle state can offer low battery temperature rise. The frequency used for pulse charge technique can be varied depending on the type and condition of a battery. PSIM 9.0.3 is utilized for simulation study and the 500 W prototype is developed to validate the proposed notion. The simulation and experimental results illustrate that the proposed pulse frequency charging technique requires shorter time to fully charge battery at SOC 80% comparing to conventional constant current and constant voltage technique about 3 times at same average charging current. The temperature rise of pulse frequency charging technique is less than a conventional one about 1 °C: This can lead to quicker charge and longer battery lifetime. The results suggest that the proposed technique can be applied for an electric vehicle quick charger station. © 2013 IEEE.