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Author: search.filters.author.Khomfoi, SurinSubject: search.filters.subject.Microgrid

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    Battery management system for microgrid applications
    (2018-07-02)
    Prompinit, Krisada
    ;
    Khomfoi, Surin
    This paper describes the operation and control methodology for a Battery Energy Storage System (BESS) designed to mitigate the negative impacts of lithium-ion energy storage. The Battery Monitoring System (BMS) provides real time status data of the battery's parameters such as current voltage and temperature in order to prevent energy storage deterioration.The data will be sent through CAN-bus that allows microcontrollers and other devices to communicate with each other in applications without a host computer. Including, energy provision.
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    A battery energy storage system control technique with ramp rate and C-rate parameter consideration for AC microgrid applications
    (2018-01-01)
    Prompinit, Krisada
    ;
    Khomfoi, Surin
    Active power control of a battery energy storage system (BESS) in an ac microgrid to solve an impact of increasing of renewable energy resources (RES) is presented. The variability of active power from these renewable energy resources affects the reliability of the power grid. A BESS is used to connect with an ac microgrid consisting of RES such solar cells to manage the rapid change in flow of active power, so the output active power from RES is regulated within the standard for connecting to the Thailand grid-connected code. Ramp rate effects and characteristics of a battery used in a BESS are considered in proposed control strategy to control the flow of active power. The micro energy management system (μEMS) for calculating the appropriate active power slope is also developed. Therefore, the frequency deviation in the microgrid is regulated by using a proposed both control technique and μEMS. The control of this method ensures that the frequency stability is within the standard range of ±1 Hz in a 50 Hz system. Simulation and experimental results of the proposed method are good agreement, and the active power of the BESS in an ac microgrid can be satisfactorily controlled.
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    An open circuit fault diagnostic technique in IGBTS for ac to dc converters applied in microgrid applications
    (2011-01-01)
    Khomfoi, Surin
    ;
    Sae-Kok, Warachart
    ;
    Ngamroo, Issarachai
    An open circuit fault diagnostic method in IGBTs for the ac to dc converters used in microgrid applications is developed in this paper. An ac to dc converter is a key technology for microgrids in order to interface both distributed generation (DG) and renewable energy resources (RES). Also, highly reliable ac to dc converters are necessary to keep converters in continuous operation as long as possible during power switch fault conditions. Therefore, the proposed fault diagnostic method is developed to reduce the fault detection time and to avoid any other fault alarms because continuous operation is desired. The proposed diagnostic method is a combination of the absolute normalized dc current technique and the false alarm suppression algorithm to overcome the long fault detection time and fault alarm problems. The simulation and experimental results show that the developed fault diagnostic method can perform fault detection within about one cycle. The results illustrate that the reliability of an ac to dc converter interfaced with a microgrid can be improved by using the proposed fault diagnostic method.