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Author: search.filters.author.Vachirasricirikul, SitthidetSubject: search.filters.subject.Plug-in hybrid electric vehicle

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    Robust controller design of microturbine and electrolyzer for frequency stabilization in a microgrid system with plug-in hybrid electric vehicles
    (2012-12-01)
    Vachirasricirikul, Sitthidet
    ;
    Ngamroo, Issarachai
    This paper proposes a new robust controller design of microturbine (MT) and electrolyzer (ES) in a control and monitoring system (CMS) for frequency stabilization in a microgrid system with plug-in hybrid electric vehicles (PHEVs). In the studied microgrid, the MT is normally used to provide the main power to the loads while the ES absorbs the power from the system to produce the hydrogen as the fuel input for the power generation of the fuel cell. On the other hand, the large numbers of PHEVs are utilized in the consumer side. The concurrent charging powers of PHEVs cause a problem of severe frequency fluctuation in the microgrid. To solve this problem, the frequency stabilization of CMS is performed by controlling the power output of MT and ES. The controller structure of MT and ES is a proportional integral with a single input. To enhance the tracking performance and the robustness against system uncertainties of the designed MT and ES controllers, the control parameters are optimized by shuffled frog leaping algorithm based on specified-structure mixed H <inf>2</inf>/H <inf>∞</inf> control technique. Simulation results not only show the frequency stabilization effect against the random charging power of PHEVs but also the high robustness of the proposed robust MT and ES controllers against the system parameters variation. © 2012 Elsevier Ltd. All rights reserved.
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    Robust load frequency control in a smart microgrid with PHEV-based V2G control
    (2012-06-12)
    Vachirasricirikul, Sitthidet
    ;
    Ngamroo, Issarachai
    This paper focuses on a new design of frequency controller for robust load frequency control (LFC) in a smart isolated microgrid (MG) system with plug-in hybrid electric vehicles (PHEV)-based vehicle-to-grid (V2G) control and wind farms. The V2G control can compensate the unbalance of real power in system. The state-of-charge (SOC) of battery can be managed by using the SOC balance control method. The studied frequency controller structure is a proportional integral (PI) with a single input. The multiplicative uncertainty is used to model the system uncertainties. To improve both robust stability margin and performance, the PI control parameters are automatically designed by the particle swarm optimization (PSO) based on the specified-structure mixed H <inf>2</inf>/H <inf>∞</inf> control method. Simulation results exhibit the superior robustness and performance of the proposed controller against the system parameters change.
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    Robust controller design of heat pump and plug-in hybrid electric vehicle for frequency control in a smart microgrid based on specified-structure mixed H2/H∞ control technique
    (2011-01-01)
    Vachirasricirikul, Sitthidet
    ;
    Ngamroo, Issarachai
    This paper proposes a new robust controller design of heat pump (HP) and plug-in hybrid electric vehicle (PHEV) for frequency control in a smart microgrid (MG) system with wind farm. The intermittent power generation from wind farm causes severe frequency fluctuation in the MG. To alleviate frequency fluctuation, the smart control of power consumption of HP and the power charging of PHEV in the customer side can be performed. The controller structure of HP and PHEV is a proportional integral derivative (PID) with single input. To enhance the performance and robustness against system uncertainties of the designed controller, the particle swarm optimization based-mixed H<inf>2</inf>/H<inf>∞</inf> control is applied to design the PID controllers of HP and PHEV. Simulation studies confirm the superior robustness and frequency control effect of the proposed HP and PHEV controllers in comparison to the conventional controller. © 2011.
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    Robust frequency control in the smart microgrid by heat pump and plug-in hybrid electric vehicle
    (2010-12-01)
    Rattanapornchai, Chalotorn
    ;
    Ngamroo, Issarachai
    ;
    Vachirasricirikul, Sitthidet
    This paper proposes a new controller design of heat pumps (HP) and plug-in hybrid electric vehicles (PHEV) for robust frequency control in a smart microgrid (MG) system with wind farm. The system frequency can be controlled by the smart power charging of HP and PHEV. The structure of power charge controller is a proportional integral derivative (PID) with single input. System uncertainties are modeled by the multiplicative uncertainty. By taking the robust stability margin into account, the particle swarm optimization (PSO) is applied to optimize the PID controller parameters of HP and PHEV concurrently based on specified-structure mixed H<inf>2</inf>/H<inf>∞</inf> control approach. Simulation results confirm the superior robustness and performance of the proposed control.