References of "Van Cutsem, Thierry"
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See detailEvaluating bounds on voltage and thermal security margins under power transfer uncertainty
Capitanescu, Florin ULg; Van Cutsem, Thierry ULg

(2002, June)

This paper deals with the evaluation of bounds on voltage and thermal security margins with respect to contingencies. A margin is the maximual pre-contingency power transfer between either a generation ... [more ▼]

This paper deals with the evaluation of bounds on voltage and thermal security margins with respect to contingencies. A margin is the maximual pre-contingency power transfer between either a generation and a load area or two generation areas, such that the specified contingencies do not overload lines or make the system voltage unstable. The minimum and maximum margins are computed for given intervals of variations of bus injections. Each bound is the solution of a constrained L1-norm minimization (or maximization) problem, for which specific algorithms are given. Thermal overloads are handled through linearization, while for voltage stability, fast time simulation and instability mode analysis are used. Nonlinear situations of branch overloads are also considered. The method is illustrated on an 80-bus test system. [less ▲]

Detailed reference viewed: 53 (10 ULg)
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See detailPreventive control of voltage security margins: A multicontingency sensitivity-based approach
Capitanescu, Florin ULg; Van Cutsem, Thierry ULg

in IEEE Transactions on Power Systems (2002), 17(2), 358-364

This paper addresses the problem of changing the operating point of a power system in order to keep voltage security margins with respect to contingencies above some minimal value. Margins take on the ... [more ▼]

This paper addresses the problem of changing the operating point of a power system in order to keep voltage security margins with respect to contingencies above some minimal value. Margins take on the form of maximum pre-contingency power transfers either between a generation and a load area or between two generation areas. They are determined by means of a fast time-domain method. We will first discuss the use of a general optimal power flow, in which linear voltage security constraints are added. The simultaneous control of several (possibly conflicting) contingencies is considered. Then, we will focus on the minimal control change objective. Among the possible controls, emphasis is put on generation rescheduling and load curtailment. Examples are presented on an 80-bus test system as well as on a real system. [less ▲]

Detailed reference viewed: 76 (13 ULg)
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See detailDesign of Load Shedding Schemes against Voltage Instability using Combinatorial Optimization
Van Cutsem, Thierry ULg; Moors, Cedric; Lefebvre, Daniel

(2002, January 31)

This paper proposes a methodology for the design of automatic load shedding against voltage instability. In a first step, we describe a method allowing to find the minimal shedding required in a given ... [more ▼]

This paper proposes a methodology for the design of automatic load shedding against voltage instability. In a first step, we describe a method allowing to find the minimal shedding required in a given unstable scenario. In a second step, we describe the structure of various controllers and identify the parameters to be optimized. Next, we present an optimization approach to find the controller parameters which optimize an overall performance objective. Results are presented on the Hydro-Québec system, in which load shedding is presently planned. [less ▲]

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See detailA Time-Scale Decomposition-Based Simulation Tool for Voltage Stability Analysis
Loud, Lester; Rousseaux, Patricia ULg; Lefebvre, Daniel et al

in Proceedings of the IEEE Porto Power Tech Conference (2001, September)

This paper proposes a time domain simulation tool combining Full Time Scale (FTS) simulation in the short-term period following a contingency and Quasi Steady-State (QSS) approximation for the long-term ... [more ▼]

This paper proposes a time domain simulation tool combining Full Time Scale (FTS) simulation in the short-term period following a contingency and Quasi Steady-State (QSS) approximation for the long-term phase. A criterion is devised to automatically switch from FTS to QSS simulation as soon as sufficient damping of short-term dynamics is reached. Various comparisons with FTS simulations have been performed on the Hydro-Qn6bec system. The proposed method is shown to combine accuracy of FTS with computational efficiency of QSS. Sensitivity of simulations to load model and the need for updating the whole model with frequency variations are also discussed. [less ▲]

Detailed reference viewed: 67 (1 ULg)
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See detailLoad Shedding Controllers against Voltage Instability: a comparison of designs
Moors, Cedric; Lefebvre, Daniel; Van Cutsem, Thierry ULg

(2001, September)

This paper discusses and compares three types of undervoltage load shedding closed-loop controllers in terms of performances and design computational effort. We first describe the various controllers and ... [more ▼]

This paper discusses and compares three types of undervoltage load shedding closed-loop controllers in terms of performances and design computational effort. We first describe the various controllers and identify the parameters to be optimized. Next, we present an optimization methodology applicable to all three types of controllers. This approach allows to find the controller parameters which optimize an overall performance objectiw. Results are presented on the Hydro-Qukbec system, in which load shedding is presently planned. [less ▲]

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See detailCombinatorial optimization approaches to the design of load shedding schemes against voltage instability
Moors, Cédric; Lefebvre, Daniel; Van Cutsem, Thierry ULg

(2000, October)

This paper proposes a methodology for the design of automatic load shedding against long-term voltage instability. In a first step, a set of training scenarios is set up, corresponding to various ... [more ▼]

This paper proposes a methodology for the design of automatic load shedding against long-term voltage instability. In a first step, a set of training scenarios is set up, corresponding to various operating conditions and disturbances. Each scenario is analyzed to determine the minimal load shedding which stabilizes the system, with due consideration for the shedding location and delay. In a second step, the parameters of a closed-loop undervoltage load shedding scheme are determined so as to: (i) approach as closely as possible the optimal sheddings computed in the first step, over the whole set of scenarios; (ii) stabilize the system in all the unstable scenarios and (iii) shed no load in the stable ones. The corresponding optimization problem is solved using three methods : genetic algorithms, branch and bound approach and the so-called “sequential design”. A detailed example is given on the Hydro-Qu´ebec system in which load shedding is presently planned. [less ▲]

Detailed reference viewed: 46 (5 ULg)
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See detailAn advanced tool for Preventive Voltage Security Assessment
Van Cutsem, Thierry ULg; Capitanescu, Florin ULg; Moors, Cédric et al

(2000, May)

This paper deals with methods for the preventive assessment of voltage security with respect to contingencies. We describe a computing tool for the determination of secure operation limits, together with ... [more ▼]

This paper deals with methods for the preventive assessment of voltage security with respect to contingencies. We describe a computing tool for the determination of secure operation limits, together with methods for contingency filtering. Examples from two very different real-life systems are provided. We outline extensions in the field of preventive control. [less ▲]

Detailed reference viewed: 81 (6 ULg)
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See detailVoltage Instability: Phenomena, Countermeasures, and Analysis Methods
Van Cutsem, Thierry ULg

in Proceedings of the IEEE (2000), 88(2), 208-227

A power system may be subject to (rotor) angle, frequency or voltage instability. Voltage instability takes on the form of a dramatic drop of transmission system voltages, which may lead to system ... [more ▼]

A power system may be subject to (rotor) angle, frequency or voltage instability. Voltage instability takes on the form of a dramatic drop of transmission system voltages, which may lead to system disruption. During the past two dàcades it has become a major threat for the operation of many systems and, in the prevailing open access erwironment, it is a factor leading to limit power transfers. The objective of this paper is to describe voltage instability phenomena, to enumerate preventive and curative countermeasures, and to present in a unified and coherent way various computer analysis methods used or proposed. [less ▲]

Detailed reference viewed: 130 (7 ULg)
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See detailDesign of Load Shedding Schemes against Voltage Instability
Moors, Cedric; Lefebvre, Daniel; Van Cutsem, Thierry ULg

(2000, January 27)

This paper proposes a methodology for the design of automatic load shedding against long-term voltage instability. In a first step, a set of training scenarios is set up, corresponding to various ... [more ▼]

This paper proposes a methodology for the design of automatic load shedding against long-term voltage instability. In a first step, a set of training scenarios is set up, corresponding to various operating conditions and disturbances. Each scenario is analyzed to determine the minimal load shedding which stabilizes the system, with due consideration for the shedding location and delay. In a second step, the parameters of a closed-loop undervoltage load shedding scheme are determined so as to: (i) approach as closely as possible the optimal sheddings computed in the first step, over the whole set of scenarios; (ii) stabilize the system in all the unstable scenarios and (iii) shed no load in the stable ones. The corresponding optimization problem is solved using a (micro-)Genetic Algorithm. A detailed example is given on the Hydro-Quebec system in which load shedding is presently planned. [less ▲]

Detailed reference viewed: 62 (3 ULg)
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See detailAnalysis of a Voltage Instability Incident in the Greek Power System
Vournas, Costas; Manos, George; Kabouris, John et al

(2000, January)

The paper reports on a 1996 incident in the Greek power system that had all the characteristics of voltage instability and the subsequent analyses and countermeasures. Voltage stability analysis is ... [more ▼]

The paper reports on a 1996 incident in the Greek power system that had all the characteristics of voltage instability and the subsequent analyses and countermeasures. Voltage stability analysis is performed by both NTUA and ULg software tools that give identical simulation results. After the upgrades performed by PPC a considerable increase in the maximum power that can be fed to the Athens area is achieved. Finally, secure operation limits of the upgraded system are calculated. [less ▲]

Detailed reference viewed: 51 (2 ULg)
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See detailDetermination of optimal load shedding against voltage instability
Moors, Cédric; Van Cutsem, Thierry ULg

in Proc. 13th Power System Computation Conference (PSCC) (1999, June)

Detailed reference viewed: 34 (3 ULg)
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See detailDetermination of secure operating limits with respect to voltage collapse
Van Cutsem, Thierry ULg; Moisse, Christel; Mailhot, Richard

in IEEE Transactions on Power Systems (1999), 14(1), 327-335

A secure operating limit is the most stressed among a given set of operating points, such that the system can withstand specified contingencies. It is a general measure of security with respect to ... [more ▼]

A secure operating limit is the most stressed among a given set of operating points, such that the system can withstand specified contingencies. It is a general measure of security with respect to incidents, incorporating pre-contingency operator or controller actions and post-contingency corrective controls. The proposed approach deals with long-term voltage stability limits. It combines a dichotomic search with quasi steady-state simulation to compute these limits with the efficiency required by real-time applications. The limit search acceleration and contingency filtering issues are also discussed. Illustrative examples are given on the Hydro-Quebec power system [less ▲]

Detailed reference viewed: 23 (0 ULg)
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See detailVoltage stability analysis of multi-level load tap changer systems
Rousseaux, Patricia ULg; Van Cutsem, Thierry ULg

in Proceedings of the 13th Power System Computation Conference (PSCC) (1999)

Detailed reference viewed: 27 (2 ULg)
See detailA DMS platform for monitoring and analysing large distribution networks
Rousseaux, Patricia ULg; Quoilin, Isabelle; Van Cutsem, Thierry ULg et al

in Proceedings of the 15th International Conference on Electricity Distribution (1999)

Detailed reference viewed: 15 (0 ULg)
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See detailVoltage security assessment of systems with multiple instability modes
Sermanson, Vincent; Moisse, Christel; Van Cutsem, Thierry ULg et al

in Proc. 4th Intern. Workshop on Bulk power systems dynamics and control (Restructuring) (1998, August)

Detailed reference viewed: 30 (0 ULg)
See detailVoltage Stability of Electric Power Systems
Van Cutsem, Thierry ULg; Vournas, Costas

Book published by Springer (previously Kluwer Academic Publishers) (1998)

Detailed reference viewed: 273 (10 ULg)
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See detailProtection against voltage collapse
Van Cutsem, Thierry ULg; Fernandez, Jose Luis; Henville, Charles F. et al

in ELECTRA (1998), (179), 110-126

Detailed reference viewed: 22 (1 ULg)
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See detailValidation of a fast voltage stability analysis method on the Hydro-Québec system
Van Cutsem, Thierry ULg; Mailhot, Richard

in IEEE Transactions on Power Systems (1997), 12

Detailed reference viewed: 23 (0 ULg)
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See detailVoltage stability analysis in transient and mid-term time scales
Van Cutsem, Thierry ULg; Vournas, Costas

in IEEE Transactions on Power Systems (1996), 11

Detailed reference viewed: 23 (1 ULg)