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Author: search.filters.author.Vachirasricirikul, SitthidetSubject: search.filters.subject.optimization

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    Design of Optimal SMES Controller Considering SOC and Robustness for Microgrid Stabilization
    (2016-10-01)
    Ngamroo, Issarachai
    ;
    Vachirasricirikul, Sitthidet
    The microgrid with wind and photovoltaic (PV) power sources unavoidably encounters the power fluctuation problem. To solve this problem, the superconducting magnetic energy storage (SMES) can be used. Nevertheless, large power fluctuation from wind and PV sources, and severe system faults may cause the overcharge or deep-discharge state of SMES. These abnormal states highly degrade the dynamic performance of the SMES. To handle these situations, this paper concentrates on the new SMES power controller design considering state-of-charge (SOC), robustness, and optimal inductance of the superconducting coil for microgrid stabilization. The active and reactive power controllers of SMES are represented by the proportional-integral (PI) control. The SOC deviation control and the mixed H<inf>2</inf>/H<inf>∞</inf> control are proposed to optimize the SMES coil inductance and PI parameters. Simulation study is performed to signify the control effect of the proposed SMES.
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    Microgrid stabilization by SMES with SOC control
    (2016-04-15)
    Ngamroo, Issarachai
    ;
    Vachirasricirikul, Sitthidet
    In the isolated microgrid with wind and photovoltaic power, the intermittent power produced from such power sources is an inevitable problem. In addition, under the occurrence of short circuits, the transient power swing may deteriorate the system stability. To deal with these problems, this paper focuses on the new power controller design of superconducting magnetic energy storage (SMES) considering the state-of-charge (SOC) control for microgrid stabilization. The structure of active and reactive power controllers of SMES is a proportional-integral (PI) controller. The optimization of PI parameters based on the minimization of the SOC deviation and the power output deviation of wind and PV sources is carried out. Simulation study confirms that the SMES with SOC control not only guarantees the stabilizing performance under normal and faulted conditions, but also prevents the over-charge and deep-discharge operations.
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    Optimized SFCL and SMES units for multimachine transient stabilization based on kinetic energy control
    (2013-03-11)
    Ngamroo, Issarachai
    ;
    Vachirasricirikul, Sitthidet
    Power system transient instability due to short circuits may result in loss of synchronism. To improve stability, resistive type superconducting fault current limiter (SFCL) and superconducting magnetic energy storage (SMES) can be effectively used. This paper proposes a new optimization of multiple SFCL and SMES units for transient stabilization in a multimachine power system based on kinetic energy control. Two applications of the proposed optimization are studied in the West Japan six-area interconnected power system. First, the SFCL is applied to solve the inevitable problems of SMES used for transient stability enhancement, i.e., required large power and energy capacities, and fail-operational performance due to the large voltage drop at the SMES bus. When the fault occurs, the SFCL swiftly reduces the increase in the kinetic energy of all generators by limiting the fault current. Subsequently, the SMES handles the remaining unbalanced kinetic energy. The optimization problem of the resistive value of the SFCL is formulated, considering energy dissipation in combination with the power controller parameters of SMES with optimal coil size. A simulation study shows the superior effect of the combined SFCL and SMES over either device separately. With SFCL, the low voltage ride-through capability of SMES can be enhanced. The MW and MJ capacities of the SMES are also significantly reduced. Second, a new optimization of multiple SFCL units considering optimal locations, optimal number, optimal resistive values, and energy dissipation during quenching state is presented. The optimization problem is formulated by maximizing the decreasing rate of energy function during fault in combination with minimizing the energy dissipation of the SFCL during quenching state. A simulation study confirms the superior effect of optimal SFCL units over nonoptimal SFCL units. © 2002-2011 IEEE.