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Author: search.filters.author.Ngamroo, IssarachaiSubject: search.filters.subject.H∞ loop shaping control

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    PSO based automatic weight selection and fixed structure robust loop shaping control for power system control applications
    (2011-04-01)
    Kaitwanidvilai, Somyot
    ;
    Olranthichachart, Piyapong
    ;
    Ngamroo, Issarachai
    This paper proposes a new technique to design a fixed-structure robust loop shaping controller for the power system control applications. The proposed technique uses Particle Swarm Optimization (PSO) to find the optimal controller parameters so that the stability margin of controlled system is maximized. Infinity norm from disturbances to states is formulated as the cost function in our optimization. In addition, weighting function, which is normally difficult to obtain, is automatically determined by PSO. In this paper, the proposed technique is adopted to design the robust controllers for both two areas interconnected power system and VAR compensator connected electric power system. The performance of the proposed controller is investigated in comparison with conventional H∞ loop shaping controller, robust controller designed by LMI method and reduced order robust controller by Hankel norm model reduction method. As results indicated, the stability margin of the proposed controller is better than that of the controller designed by LMI method and the reduced order robust controller. In addition, the order of the proposed controller is much lower than that of the conventional robust loop shaping controller, making it easy to implement in practical works. ICIC International © 2011.
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    Design of robust control and monitoring system for microgrid stabilization
    (2009-10-22)
    Vachirasricirikul, Sitthidet
    ;
    Ngamroo, Issarachai
    ;
    Kaitwanidvilai, Somyot
    ;
    Chaiyatham, Theerawut
    This paper proposes a design of the robust control and monitoring system (RCMS) for stabilization of microgrid (MG) system. The power sources in MG consists of wind power (WP), photovoltaic (PV), micro-turbine (MT) and fuel cell (FC). Due to intermittent powers from WP, PV and load fluctuations, the MG stabilization of RCMS is performed by controlling the power outputs of MT and electrolyzer system (ES) in both islanding and interconnected utility grid operations. The structure of MT and ES controllers is the proportional integral (PI). By taking system uncertainties into account, control parameters of MT and ES are simultaneously optimized based on the particle swarm optimization (PSO) based fixed-structure H<inf>∞</inf> loop shaping control. Simulation results show the robustness and effectiveness of the proposed RCMS against the variation of system parameters and operating conditions. ©2009 IEEE.
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    Application of electrolyzer system to enhance frequency stabilization effect of microturbine in a microgrid system
    (2009-09-01)
    Vachirasricirikul, Sitthidet
    ;
    Ngamroo, Issarachai
    ;
    Kaitwanidvilai, Somyot
    It is well known that the power output of microturbine can be controlled to compensate for load change and alleviate the system frequency fluctuations. Nevertheless, the microturbine may not adequately compensate rapid load change due to its slow dynamic response. Moreover, when the intermittent power generations from wind power and photovoltaic are integrated into the system, they may cause severe frequency fluctuation. In order to study the fast dynamic response, this paper applies electrolyzer system to absorb these power fluctuations and enhance the frequency control effect of microturbine in the microgrid system. The robust coordinated controller of electrolyzer and microturbine for frequency stabilization is designed based on a fixed-structure H<inf>∞</inf> loop shaping control. Simulation results exhibit the robustness and stabilizing effects of the proposed coordinated electrolyzer and microturbine controllers against system parameters variation and various operating conditions. Crown Copyright © 2009.