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  • 1. Martinez, E. M.
    et al.
    Vanfretti, Luigi
    KTH, School of Electrical Engineering (EES), Electric Power Systems.
    Segundo Sevilla, Felix Rafael
    KTH, School of Electrical Engineering (EES).
    Automatic triggering of the interconnection between Mexico and central America using discrete control schemes2013In: 2013 4th IEEE/PES Innovative Smart Grid Technologies Europe, ISGT Europe 2013, IEEE , 2013, p. 6695333-Conference paper (Refereed)
    Abstract [en]

    In the current energy exchange market it is essential to guarantee continuity and quality of supply both in steady state and during contingencies that might occur in any subsystem of interconnected systems. In this work it is shown how the geographical and topological characteristics of the subnetworks directly affect the quality and reliability in the energy exchange, especially when subsystems are interconnected without asynchronous ties that prevent power, frequency or voltage oscillations. This paper describes the problems faced by the interconnection between Mexico and the countries that define the Interconnected Electric System of the Central American Countries (SIEPAC). Different oscillations that have occurred are analyzed. Discrete control schemes to automatically trigger the 400 KV circuit that interconnects the systems of Mexico and Guatemala are proposed.

  • 2.
    Segundo Sevilla, Felix Rafael
    et al.
    Department of Electrical and Electronic Engineering, Imperial College London, London, UK.
    Jaimoukha, Imad
    Imperial College London.
    Chaudhuri, Balarko
    Imperial College London.
    Korba, Petr
    Zurich University of Applied Sciences.
    Fault-tolerant control design to enhance damping of inter-area oscillations in power grids2013In: International Journal of Robust and Nonlinear Control, ISSN 1049-8923, E-ISSN 1099-1239, Vol. 24, no 8-9, p. 1304-1316Article in journal (Refereed)
    Abstract [en]

    In this paper, passive and active approaches for the design of fault-tolerant controllers (FTCs) are presented. The FTCs are used to improve the damping of inter-area oscillations in a power grid. The effectiveness of using a combination of local and remote (wide area) feedback signals is first demonstrated. The challenge is then to guarantee a minimum level of dynamic performance following a loss of remote signals. The designs are based on regional pole placement using linear matrix inequalities. First, a passive FTC is proposed. It is shown that the computation of the controller reduces to the solution of bilinear matrix inequalities. An iterative procedure is then used to design the controller. Next, as an alternative to active, time-varying controllers, one for each fault scenario, we propose an approach for the design of a ‘minimal switching’ FTC in which only one controller is designed, but where a simple switch is incorporated into the controller structure. A case study in a linear and nonlinear Nordic equivalent system is presented to show that the closed-loop response using a conventional control design could deteriorate the performance or even destabilize the system if the remote signals are lost and to demonstrate the effectiveness of the proposed FTC designs.

  • 3.
    Segundo Sevilla, Felix Rafael
    et al.
    KTH, School of Electrical Engineering (EES), Electric Power Systems.
    Korba, P.
    Semi-active wide-area fault-tolerant control in electric power systems2014In: Proceedings of the 19th IFAC World Congress, 2014, International Federation of Automatic Control (IFAC) , 2014, p. 3605-3610Conference paper (Refereed)
    Abstract [en]

    In this paper is presented a semi-active fault-tolerant control (SAFTC) as an alternative to reconfigurable or self-repairing fault-tolerant architectures with application to power systems. The final goal is to achieve stability and a minimum level of system performance following the completely loss of the feedback signals in the controller, which in this case are remote wide-area signals. The proposed controller is designed under the framework of Linear Matrix Inequalities (LMIs) to achieve pole placement. The semi-active design is compared against and ordinary or non-fault-tolerant control design to highlight that following the loss of a wide-area signal in the control, the closed loop response can lead to instability in the non-fault-tolerant case. The results are validated through nonlinear simulations results using a reduced version of the Nordic power system where the effectiveness of the proposed approach is demonstrated.

  • 4.
    Segundo Sevilla, Felix Rafael
    et al.
    KTH, School of Electrical Engineering (EES), Electric Power Systems.
    Vanfretti, Luigi
    KTH, School of Electrical Engineering (EES), Electric Power Systems.
    A Small-Signal Stability Index for Power System Dynamic Impact Assessment using Time-domain Simulations2014In: 2014 IEEE PES General Meeting - Conference & Exposition, IEEE Computer Society, 2014, Vol. 2014-October, article id 6938842Conference paper (Refereed)
    Abstract [en]

    In this paper, a three layer small-signal stability index to assess power system dynamic simulations is presented. The index is calculated from an estimate of the eigenvalues of the system, which are determined using time-series from dynamic simulations. The methodology assumes that no other information about the system (model) is available. In the first layer, which is the main future of the index, a scalar (positive or negative) indicates if any of the modes have a damping ratio less than a pre-defined value. In the second layer, a vector is used to specify which pre-defined damping ratios were violated and finally, in the third layer a matrix is used to retrieve precise information about which mode has violated the pre-defined damping requirements of the system. The proposed index is first illustrated using synthetic data and then the index is validated using simulation data from the KTH-Nordic32 system.

  • 5.
    Sevilla, Félix Rafael Segundo
    et al.
    KTH, School of Electrical Engineering (EES), Electric Power Systems.
    Vanfretti, Luigi
    KTH, School of Electrical Engineering (EES), Electric Power Systems.
    Static stability indexes for classification of power system time-domain simulations2015In: 2015 IEEE Power and Energy Society Innovative Smart Grid Technologies Conference, ISGT 2015, IEEE conference proceedings, 2015Conference paper (Refereed)
    Abstract [en]

    Two new static indexes that use time series from power system dynamic simulations are presented on this paper. The proposed indexes are used to check whether the time series from dynamic simulations will converge to a safe and stable equilibrium point and to measure the quality of the stability. They can also be used to classify simulations according to the severity of the contingency applied. The Integral Square Generator Angle (ISGA) index is used as a dynamic index to assess the validity of the proposed indexes and their use for classification of timedomain simulations. An illustrative example using the Klein-Rogers-Kundur's two-area system is presented and then the static indexes are validated trough several nonlinear simulations using the KTH-Nordic32 system.

  • 6. Vanfretti, Luigi
    et al.
    Sevilla, Félix Rafael Segundo
    KTH, School of Electrical Engineering (EES), Electric Power Systems.
    A three-layer severity index for power system voltage stability assessment using time-series from dynamic simulations2015In: IEEE PES Innovative Smart Grid Technologies Conference Europe, IEEE Computer Society, 2015, no JanuaryConference paper (Refereed)
    Abstract [en]

    This paper presents a three-layer voltage stability index computed using time-series obtained from dynamic simulations. The proposed index provides the distance with respect to voltage and power limits. Voltage, active and reactive power signals, which are determined using time series from dynamic simulations, are used to compute the index. The methodology assumes that no other information about the system (model) is available. A set of 3 different simulations at different loading levels and a given contingency are required to calculate the index. In the first layer, a two-element vector indicates if a power or a voltage limit was violated. In the second layer, a vector is used to specify which power and voltage loading level was violated and finally, in the third layer a matrix is used to retrieve precise information about which power and voltage limit has been violated in pre- or post-contingency. The index can analyze simultaneously different buses. The proposed index is illustrated using synthetic data and then tested using timedomain simulations on the KTH-Nordic32 system.

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