References of "Ruiz-Vega, Daniel"
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See detailPower system transient stability preventive and emergency control
Ruiz-Vega, Daniel; Wehenkel, Louis ULg; Ernst, Damien ULg et al

in Savulescu, Savu (Ed.) Real-Time Stability in Power Systems 2nd Edition (2014)

A general approach to real-time transient stability control is described, yielding various complementary techniques: pure preventive, open loop emergency, and closed loop emergency controls. Recent ... [more ▼]

A general approach to real-time transient stability control is described, yielding various complementary techniques: pure preventive, open loop emergency, and closed loop emergency controls. Recent progress in terms of a global transient stability constrained optimal power flow are presented, yielding in a scalable nonlinear programming formulation which allows to take near-optimal decisions for preventive control with a computing budget corresponding only to a few runs of standard optimal power flow and time domain simulations. These complementary techniques meet the stringent conditions imposed by the real-life applications. [less ▲]

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See detailE-SIME- A method for transient stability closed-loop emergency control: achievements and prospects
Glavic, Mevludin; Ernst, Damien ULg; Ruiz-Vega, Daniel et al

in Proceedings of 2007 IREP Symposium - Bulk Power Systems Dynamics and Control - VII (2007)

A general response-based technique is presented for closed-loop transient stability emergency control. It relies on E-SIME, derived from the hybrid transient stability method, SIME. E-SIME uses real-time ... [more ▼]

A general response-based technique is presented for closed-loop transient stability emergency control. It relies on E-SIME, derived from the hybrid transient stability method, SIME. E-SIME uses real-time information supposed to be furnished by phasor measurement units to predict the stability status of the power system, and, in view of an imminent instability, to design and trigger appropriate countermeasures, while continuing monitoring in order to check their effectiveness or to apply additional ones. Performance of the method in terms of accuracy and rapidity is scrutinized and illustrated on several real-world power system examples. New technical solutions and algorithms for the accurate estimation and prediction of power system quantities most relevant to the method are discussed. The observations from a recent investigation and conclusions that could prove useful for improving further the method are summarized together with some realistic timing considerations. A natural coupling of the two SIME based emergency control techniques: open-loop emergency control and E-SIME, so as to combine their complementary features is also discussed. [less ▲]

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See detailPreventive and emergency control of power systems
Wehenkel, Louis ULg; Ruiz-Vega, Daniel; Ernst, Damien ULg et al

in Real Time Stability in Power Systems - Techniques for Early Detection of the Risk of Blackout (2005)

A general approach to real-time transient stability control is described, yielding various complementary techniques: pure preventive, open loop emergency, and closed loop emergency controls. The ... [more ▼]

A general approach to real-time transient stability control is described, yielding various complementary techniques: pure preventive, open loop emergency, and closed loop emergency controls. The organization of the resulting control schemes is then revisited in order to make it able to cover static and voltage security, in addition to transient stability. Distinct approaches for preventive and emergency operating conditions are advocated. [less ▲]

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See detailTransient stability emergency control combining open-loop and closed-loop technique
Ruiz-Vega, Daniel; Glavic, Mevludin; Ernst, Damien ULg

in Proceedings of the IEEE Power Engineering Society General Meeting, 2003 (2003)

An on-line transient stability emergency control approach is proposed, which couples an open-loop and a closed-loop emergency control technique. The open-loop technique uses on-line transient stability ... [more ▼]

An on-line transient stability emergency control approach is proposed, which couples an open-loop and a closed-loop emergency control technique. The open-loop technique uses on-line transient stability assessment in order to adapt the settings of automatic system protection schemes to the current operating conditions. On the other hand, the closed-loop technique uses measurements in order to design and trigger countermeasures, after the contingency has actually happened, then to continue monitoring in a closed-loop fashion. The approach aims at combining advantages of event-based and measurement-based system protection schemes, namely, speed of action and robustness with respect to uncertainties in system modeling. It can also comply with economic criteria. [less ▲]

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See detailClosure of "a unified approach to transient stability contingency filtering, ranking, and assessment"
Ernst, Damien ULg; Ruiz-Vega, Daniel; Pavella, Mania ULg et al

in IEEE Transactions on Power Systems (2002), 17(2), 528-529

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See detailA unified approach to transient stability contingency filtering, ranking and assessment
Ernst, Damien ULg; Ruiz-Vega, Daniel; Pavella, Mania ULg et al

in IEEE Transactions on Power Systems (2001), 16(3), 435-443

This paper proposes a unified approach to contingency filtering, ranking and assessment in power system transient stability studies. The approach consists of two-block techniques in which the first block ... [more ▼]

This paper proposes a unified approach to contingency filtering, ranking and assessment in power system transient stability studies. The approach consists of two-block techniques in which the first block selects from a list of contingencies the a priori “interesting” ones, that the second block ranks and assesses. This Filtering, Ranking and Assessment (FILTRA) approach relies on SIME (for SIngle Machine Equivalent). SIME is a hybrid direct-time-domain stability method which combines accuracy and flexibility skills of time-domain methods with sound additional possibilities of direct methods. The FILTRA approach is fully general: it may adapt itself to the specifics of any power system (modeling, protection characteristics, etc.), any contingency scenario and mode of (in)stability (first- or multi-swing, local or inter-area mode) and any application context (planning, operation planning and real-time operation). The approach is illustrated on two EHV power systems, having different structures, control and protective devices. The adequacy of its filtering and ranking capabilities is illustrated in terms of performance criteria such as reliability (ability to consistently capture all dangerous contingencies), effectiveness (ability to avoid false alarms) and computational efficiency (ability to comply with real-time requirements). Further, the assessment task is shown to provide the operator with sound information and effective means of control. [less ▲]

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See detailAn approach to modal analysis of power system angle stability
Roth, Anna; Ruiz-Vega, Daniel; Ernst, Damien ULg et al

in Proceedings of IEEE Powertech 2001 (2001)

An approach to modal analysis and modal identification is proposed, capable of complementing the panoply of existing methods. It is based on a hybrid time-domain – direct transient stability method called ... [more ▼]

An approach to modal analysis and modal identification is proposed, capable of complementing the panoply of existing methods. It is based on a hybrid time-domain – direct transient stability method called SIME (for SIngle Machine Equivalent). In short, SIME uses a conventional transient stability program to transform the time varying parameters of the system into those of a one-machine infinite bus (OMIB) equivalent system. The representations of this OMIB allow substantial reduction of the original problem’s dimensionality. Many important advantages may result. For example, the multimachine system unstable equilibrium point (UEP) can readily be derived from the OMIB UEP, which is calculated analytically and unambiguously in a two-dimensional space. Further, the interplay between multimachine and OMIB characteristics and their complementary properties provides a better understanding and handling of damping, inter-area oscillations and their control. More generally, modal analysis and modal identification tasks get closer to each other and easier to handle. The paper essentially focuses on the approach as such rather than on potential applications. Simulations carried out on a 3-machine system illustrate main features. [less ▲]

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See detailTransient Stability of Power Systems: A Unified Approach to Assessment and Control
Pavella, Mania ULg; Ernst, Damien ULg; Ruiz-Vega, Daniel

Book published by Kluwer Academic Publishers (2000)

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See detailOn-line transient stability constrained ATC calculations
Avilas-Rosales, R.; Ruiz-Vega, Daniel; Ernst, Damien ULg et al

in Proceedings of the IEEE Power Engineering Society Summer Meeting 2000 - Volume 2 (2000)

Transient Stability Assessment, preventive control measures and dynamic A X calculations are addressed for the new deregulated EMS system. The combination of time domain analysis, SIME and Optimal Power ... [more ▼]

Transient Stability Assessment, preventive control measures and dynamic A X calculations are addressed for the new deregulated EMS system. The combination of time domain analysis, SIME and Optimal Power Flow provide a reliable solution for future transaction requirements and the current operating point. [less ▲]

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See detailA contingency filtering, ranking and assessment technique for on-line transient stability studies
Ruiz-Vega, Daniel; Ernst, Damien ULg; Machado Ferreira, C. et al

in Proceedings of International Conference on Electric Utility Deregulation and Restructing and Power Technologies 2000 (2000)

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See detailPreventive countermeasures for transient stability-constrained power systems
Ruiz-Vega, Daniel; Ernst, Damien ULg; Pavella, Mania ULg

in Proceedings of the VII Symposium of Specialists in Electric Operational and Expansion Planning (SEPOPE 2000) (2000)

A general transient stability control technique is applied to the design of preventive countermeasures consisting of rescheduling generators’ active power. The technique relies on SIME, a hybrid ... [more ▼]

A general transient stability control technique is applied to the design of preventive countermeasures consisting of rescheduling generators’ active power. The technique relies on SIME, a hybrid direct–time-domain method; and, like SIME, it preserves the accuracy of time-domain methods and their ability to handle any power system modeling, stability scenario and mode of instability. Its application to generation rescheduling may provide various patterns, able to comply with various operational specifics and strategies, as, for example, congestion management or available transfer capability calculations. The paper suggest how the technique may be shaped to choose automatically rescheduling patterns. A sample of such patterns are illustrated via simulations performed on an EPRI test system. [less ▲]

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See detailPreventive and emergency transient stability control
Ernst, Damien ULg; Ruiz-Vega, Daniel; Pavella, Mania ULg

in Proceedings of the VII Symposium of Specialists in Electric Operational and Expansion Planning (SEPOPE 2000) (2000)

A unified approach to transient stability closed-loop control is presented. It relies on the general transient stability method called SIME, from which the Preventive and the Emergency SIMEs are derived ... [more ▼]

A unified approach to transient stability closed-loop control is presented. It relies on the general transient stability method called SIME, from which the Preventive and the Emergency SIMEs are derived. The Preventive SIME uses time-domain simulations of plausible contingencies prior to their occurrence, for the online power system monitoring from the control room. The Emergency SIME, on the other hand, uses real-time measurements, acquired on the system power plants after the actual occurrence of a contingency in order to appraise and trigger countermeasures indispensable for the system integrity. Despite fundamental differences in their design and objectives, the two approaches have also common features. This paper highlights main differences and similarities, and illustrates them on a realistic, large power system. The tradeoff between on-line preventive control and real-time emergency control is also assessed in terms of size of the involved countermeasures. [less ▲]

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See detailA general framework for power system transient stability control
Pavella, Mania ULg; Ernst, Damien ULg; Ruiz-Vega, Daniel

in IEEE Power Engineering Society Letters (1999), 19(10), 45-46

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See detailTransient stability-constrained optimal power flow
Bettiol, Arlan; Ruiz-Vega, Daniel; Ernst, Damien ULg et al

in Proceedings of the IEEE Power Tech'99 (1999)

This paper proposes a new approach able to maximize the interface flow limits in power systems and to find a new operating state that is secure with respect to both, dynamic (transient stability) and ... [more ▼]

This paper proposes a new approach able to maximize the interface flow limits in power systems and to find a new operating state that is secure with respect to both, dynamic (transient stability) and static security constraints. It combines the Maximum Allowable Transfer (MAT) method, recently developed for the simultaneous control of a set of contingencies, and an Optimal Power Flow (OPF) method for maximizing the interface power flow. The approach and its performances are illustrated by means of simulations carried out on a real world power system. [less ▲]

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See detailTransient stability-constrained generation rescheduling
Ruiz-Vega, Daniel; Bettiol, Arlan; Ernst, Damien ULg et al

in Proceedings of 1998 IREP Symposium - Bulk Power System Dynamics and Control - IV (1998, August)

Detailed reference viewed: 72 (3 ULg)