References of "Glavic, Mevludin"
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See detailA framework for dynamic security assessment of combined multi-terminal HVDC and AC grids
Papangelis, Lampros ULiege; Glavic, Mevludin ULiege; Van Cutsem, Thierry ULiege

in Proc. IEEE PES PowerTech conference (in press)

This paper discusses some challenges that dynamic security assessment and control will face due to the integration of multi-terminal high-voltage direct-current grids and the resulting interconnection of ... [more ▼]

This paper discusses some challenges that dynamic security assessment and control will face due to the integration of multi-terminal high-voltage direct-current grids and the resulting interconnection of multiple asynchronous AC areas. A conceptual framework is outlined to address these challenges and ensure the security of the combined AC/DC system. The need for cooperation and exchange of information between the various transmission system operators is highlighted in order to take full advantage of the control flexibility of HVDC converters in post-contingency situations. [less ▲]

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See detailCritical Time Windows for Renewable Resource Complementarity Assessment
Berger, Mathias ULiege; Radu, David-Constantin ULiege; Fonteneau, Raphaël ULiege et al

E-print/Working paper (2018)

This paper proposes a systematic framework to assess the complementarity of renewable resources over arbitrary geographical scopes and temporal scales which is particularly well-suited to exploit very ... [more ▼]

This paper proposes a systematic framework to assess the complementarity of renewable resources over arbitrary geographical scopes and temporal scales which is particularly well-suited to exploit very large data sets of climatological data. The concept of critical time windows is introduced, and a spatio-temporal criticality indicator is proposed, consisting in a parametrised family of scalar indicators quantifying the complementarity between renewable resources in both space and time. The criticality indicator is leveraged to devise a family of optimisation problems identifying sets of locations with maximum complementarity under arbitrary geographical deployment constraints. The applicability of the framework is shown in a case study investigating the complementarity between the wind regimes in continental western Europe and southern Greenland, and its usefulness in a power system planning context is demonstrated. Besides showing that the occurrence of low wind power production events can be significantly reduced on a regional scale by exploiting diversity in local wind patterns, results highlight the fact that aggregating wind power production sites located on different continents may result in a lower occurrence of system-wide low wind power production events and indicate potential benefits of intercontinental electrical interconnections. [less ▲]

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See detailReal-time corrective control of active distribution networks: validation in future scenarios of a real system
Soleimani Bidgoli, Hamid; Glavic, Mevludin ULiege; Van Cutsem, Thierry ULiege

in CIGRE Science and Engineering (2018), 12

Distribution grids are hosting more and more dispersed generation units exploiting renewable energy sources. Their proliferation, and the intermittent nature of their production creates new operation ... [more ▼]

Distribution grids are hosting more and more dispersed generation units exploiting renewable energy sources. Their proliferation, and the intermittent nature of their production creates new operation problems such as overvoltage and/or thermal overload. Hence, the need for realtime corrective control goes increasing. This paper reports on comprehensive simulation tests of a centralized, coordinated control algorithm aimed at correcting abnormal voltages and/or branch overloads in an active distribution network. It relies on the model predictive control concept, for robustness with respect to model inaccuracies, noise, etc. The set-points of the dispersed generation units and the load tap changer are smoothly varied until the violation is cleared. The tests involve a real distribution network and plausible scenarios of future penetration of renewable energy sources. The dynamic evolution of the system has been simulated, with the controller in action, over full days where limit violations were taking place in its absence. Its capability to resolve the voltage and/or thermal issues is demonstrated. This corrective control allows postponing expensive network reinforcements and avoids to the largest possible extent curtailment of dispersed generation using renewable energy sources. [less ▲]

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See detailA Constructive Intelligent Power System Damping Control
Glavic, Mevludin ULiege

Diverse speeche and writing (2018)

This text complements material presented in [1,2] where the opportunity to make power system controls with increased capabilities by synergetic fusion of the domain-specific knowledge and the ... [more ▼]

This text complements material presented in [1,2] where the opportunity to make power system controls with increased capabilities by synergetic fusion of the domain-specific knowledge and the methodologies from control theory and artificial intelligence, is presented. The particular approach in [1,2] considered combination of Control Lyapunov Functions (CLF), a constructive control technique, and Reinforcement Learning (RL) to optimize a mix of system stability and performance. Domain specific knowledge is used to derive CLF for power systems as well as reward in RL. Furthermore, this text position the approach as constructive intelligent control for damping power system electromechanical oscillations. Two control schemes are proposed and the capabilities of the resulting controllers are illustrated on a control problem involving a Thyristor Controlled Series Capacitor (TCSC) for damping oscillations in a four-machine power system. [less ▲]

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See detailNotes on security of electricity supply, some practical problems in MV/LV networks and legal aspects of building global grid
Glavic, Mevludin ULiege

E-print/Working paper (2018)

This documents presents a note on security of electricity supply and several short notes on some technical problems in MV/LV networks and legal aspects related to building global grid. The only aim of the ... [more ▼]

This documents presents a note on security of electricity supply and several short notes on some technical problems in MV/LV networks and legal aspects related to building global grid. The only aim of the document is to provide potentially useful material for those interested in the problems (particularly those at initial stage of their research). Considered problems include: 1. Security of electricity supply, 2. Approaches for optimal placement of DGs and EV’s charging stations, 3. Approaches for corrective measures (load flexibility and generation curtailment) in LV networks, 4. Approaches to infer LV network model from smart meter data, 5. Approaches for phases balancing in LV networks, 6. Approaches for voltage and thermal overload control in active distribution networks, and 7. Legal aspects related to building Global Grid. [less ▲]

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See detailOperation of distribution systems within secure limits using real-time Model Predictive Control
Soleimani Bidgoli, Hamid ULiege; Valverde, Gustavo; Aristidou, Petros et al

in Rueda Torres, Jose (Ed.) Dynamic Vulnerability Assessment and Intelligent Control for Sustainable Power Systems (2018)

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See detailReinforcement Learning for Electric Power System Decision and Control: Past Considerations and Perspectives
Glavic, Mevludin ULiege; Fonteneau, Raphaël ULiege; Ernst, Damien ULiege

in The 20th World Congress of the International Federation of Automatic Control, Toulouse 9-14 July 2017 (2017, July)

In this paper, we review past (including very recent) research considerations in using reinforcement learning (RL) to solve electric power system decision and control problems. The RL considerations are ... [more ▼]

In this paper, we review past (including very recent) research considerations in using reinforcement learning (RL) to solve electric power system decision and control problems. The RL considerations are reviewed in terms of speci c electric power system problems, type of control and RL method used. We also provide observations about past considerations based on a comprehensive review of available publications. The review reveals the RL is considered as viable solutions to many decision and control problems across di erent time scales and electric power system states. Furthermore, we analyse the perspectives of RL approaches in light of the emergence of new-generation, communications, and instrumentation technologies currently in use, or available for future use, in power systems. The perspectives are also analysed in terms of recent breakthroughs in RL algorithms (Safe RL, Deep RL and path integral control for RL) and other, not previously considered, problems for RL considerations (most notably restorative, emergency controls together with so-called system integrity protection schemes, fusion with existing robust controls, and combining preventive and emergency control). [less ▲]

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See detailAn Improved On-line Contingency Screening for Power System Transient Stability Assessment
Weckesser, Johannes ULiege; Jóhannsson, Hjörtur; Glavic, Mevludin ULiege et al

in Electric Power Components and Systems (2017)

This paper presents a contingency screening method and a framework for its on-line implementation. The proposed method carries out contingency screening and on-line stability assessment with respect to ... [more ▼]

This paper presents a contingency screening method and a framework for its on-line implementation. The proposed method carries out contingency screening and on-line stability assessment with respect to first-swing transient stability. For that purpose, it utilizes the single machine equivalent method and aims at improving the prior developed contingency screening approaches. In order to determine vulnerability of the system with respect to a particular contingency, only one time-domain simulation needs to be performed. An early stop criteria is proposed so that in a majority of the cases the simulation can be terminated after a few hundred milliseconds of simulated system response. The method’s outcome is an assessment of the system’s stability and a classification of each considered contingency. The contingencies are categorized by exploiting parameters of an equivalent one machine infinite bus system. A novel island detection approach, appropriate for an on-line application since it utilizes efficient algorithms from graph theory and enables stability assessment of individual islands, is also introduced. The New England and New York system as well as the large-scale model of the Continental-European interconnected system are used to test the proposed method with respect to assessment accuracy and computation time. [less ▲]

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See detailPotential, opportunities and benefits of electric vehicles as frequency regulation resources
Glavic, Mevludin ULiege; Alvarado, Fernando

E-print/Working paper (2016)

Any imbalance between electric power supply and demand results in power system frequency deviations from its nominal value. Frequency regulation is one of the most important services that regional system ... [more ▼]

Any imbalance between electric power supply and demand results in power system frequency deviations from its nominal value. Frequency regulation is one of the most important services that regional system operators perform to ensure reliable system operation. Traditional power supply sources such as generators are usually automatically modulated to help balance generation and demand by adjusting their output based in part on system frequency. As a result of the decreased inertia of the system caused by decommissioning of traditional power plants and the increase in the penetration of renewable energy sources, the increased use of demand side controls for the purpose of frequency regulation is receiving increased attention. Demand control can provide fast response to any imbalance. This opens up the possibility for Electric Vehicles (EVs) to be used as frequency regulation grid resources. This write-up discusses the potential, opportunities and benefit of doing so. [less ▲]

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See detailDynamic Equivalents of Active Distribution Networks: A short Review
Glavic, Mevludin ULiege

E-print/Working paper (2016)

The complexity of modern power systems, despite impressive progress in computational architectures, still necessitate simplified representation of their parts for local dynamic studies. The high ... [more ▼]

The complexity of modern power systems, despite impressive progress in computational architectures, still necessitate simplified representation of their parts for local dynamic studies. The high penetration of Distributed Generation (DG) at the transmission and distribution network levels, the new load types and increased use of power electronics are among key factors contributing to the systems’ complexity. Particularly, representation of active distribution networks (ADN) in dynamic studies became an important research and practical implementation question. This report shortly reviews previous and existing approaches for dynamic equivalencing of ADNs and offers some recommendations for future research on this important issue. The report is organized as follows. First, the problem of dynamic equivalencing is shortly presented together with approaches to compute them. This is followed by a quick review of past notable works on this problem. Next, the approaches for dynamic equivalencing of ADNs, proposed so far in literature (available to the author), are reviewed. The reports ends with some recommendations for future research. [less ▲]

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See detailReceding-Horizon Control of Distributed Generation to Correct Voltage or Thermal Violations and Track Desired Schedules
Soleimani Bidgoli, Hamid ULiege; Glavic, Mevludin ULiege; Van Cutsem, Thierry ULiege

in Proceedings of the 19th PSCC (2016, June 23)

This paper presents a real-time, centralized control system acting on the active and reactive powers of distributed generators when the network experiences voltage and/or thermal limits violation. The ... [more ▼]

This paper presents a real-time, centralized control system acting on the active and reactive powers of distributed generators when the network experiences voltage and/or thermal limits violation. The control resorts on multi-step receding-horizon optimization. The objective is to minimize the deviations of Dispersed Generation Units (DGU) active and reactive powers from reference values. The reactive power corrections have priority over the active ones. Furthermore, the formulation is such that DGU powers are restored to their desired schedule as soon as operating conditions allow doing so. Three modes of operation of the proposed controller are presented, involving dispatchable units as well as DGUs operated to track maximum power output. The effectiveness of the proposed control is illustrated through detailed simulations of a 75-bus, 11-kV system hosting 22 DGUs. [less ▲]

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See detailA Gaussian mixture approach to model stochastic processes in power systems
Gemine, Quentin ULiege; Cornélusse, Bertrand ULiege; Glavic, Mevludin ULiege et al

in Proceedings of the 19th Power Systems Computation Conference (PSCC'16) (2016, June)

Probabilistic methods are emerging for operating electrical networks, driven by the integration of renewable generation. We present an algorithm that models a stochastic process as a Markov process using ... [more ▼]

Probabilistic methods are emerging for operating electrical networks, driven by the integration of renewable generation. We present an algorithm that models a stochastic process as a Markov process using a multivariate Gaussian Mixture Model, as well as a model selection technique to search for the adequate Markov order and number of components. The main motivation is to sample future trajectories of these processes from their last available observations (i.e. measurements). An accurate model that can generate these synthetic trajectories is critical for applications such as security analysis or decision making based on lookahead models. The proposed approach is evaluated in a lookahead security analysis framework, i.e. by estimating the probability of future system states to respect operational constraints. The evaluation is performed using a 33-bus distribution test system, for power consumption and wind speed processes. Empirical results show that the GMM approach slightly outperforms an ARMA approach. [less ▲]

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See detailFurther validation and extensions of the Global Capacity ANnouncement procedure for distribution systems
Cornélusse, Bertrand ULiege; Vangulick, David; Glavic, Mevludin ULiege et al

in CIRED Workshop Proceedings, Helsinki 14-15 June 2016 (2016, May)

This paper extends the Global Capacity ANnouncement procedure proposed in [5] along two directions. First, two new stopping criteria are considered. Second, annual losses are evaluated using ... [more ▼]

This paper extends the Global Capacity ANnouncement procedure proposed in [5] along two directions. First, two new stopping criteria are considered. Second, annual losses are evaluated using representative days to approximate the injection duration curve. The extensions are validated on an updated model of a real-life system. The emphasis is on the situation in the Walloon region of Belgium considered in the GREDOR project [1]. A way for a DSO to publish Global Capacity ANnouncement computation results is shortly discussed. [less ▲]

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See detailImproved Thévenin equivalent methods for real-time voltage stability assessment
Perez, Angel; Johannsson, Hjortur; Ostergaard, Jacob et al

in proc. IEEE ENERGYCON Conference (2016, April)

An improved Thévenin equivalent method for real-time voltage stability assessment that uses wide-area information from synchrophasors is proposed. The improvements are a better modeling of the limited ... [more ▼]

An improved Thévenin equivalent method for real-time voltage stability assessment that uses wide-area information from synchrophasors is proposed. The improvements are a better modeling of the limited synchronous generators, and a processing that anticipates the effect of field current limiters, before the latter are activated. Several study cases using detailed dynamic simulations of the Nordic test system have been used to assess the performance of the proposed improvements. Their effectiveness is analyzed and, based on the results, their possible application in combination with the sensitivity-based voltage stability assessment method is explored. [less ▲]

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See detailModel Predictive Control for Reference Tracking in Distribution Networks Hosting Dispersed Generation
Soleimani Bidgoli, Hamid ULiege; Glavic, Mevludin ULiege; Van Cutsem, Thierry ULiege

Scientific conference (2015, November 23)

A real-time, centralized control system is presented which is acting on the active and reactive powers of distributed generators when the network experiences voltage and/or thermal limits violation. The ... [more ▼]

A real-time, centralized control system is presented which is acting on the active and reactive powers of distributed generators when the network experiences voltage and/or thermal limits violation. The control resorts to multi-step receding horizon optimization. The objective is to minimize the deviations of Dispersed Generation Units (DGU) active and reactive powers from reference values. Furthermore, the formulation is such that DGU powers are restored to their desired schedule as soon as operating conditions allow doing so. Three modes of operation of the proposed controller are presented, involving dispatchable units as well as DGUs operated to collect maximum power. [less ▲]

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See detailGlobal capacity announcement of electrical distribution systems: A pragmatic approach
Cornélusse, Bertrand ULiege; Vangulick, David; Glavic, Mevludin ULiege et al

in Sustainable Energy, Grids and Networks (2015), 4

We propose a pragmatic procedure to facilitate the connection process of Distributed Generation (DG) with reference to the European regulatory framework where Distribution System Operators (DSOs) are ... [more ▼]

We propose a pragmatic procedure to facilitate the connection process of Distributed Generation (DG) with reference to the European regulatory framework where Distribution System Operators (DSOs) are, except in specific cases, not allowed to own their generation. The procedure is termed Global Capacity ANnouncement (GCAN) and is intended to compute the estimates of maximum generation connection amount at appropriate substations in a distribution system, to help generation connection decisions. The pragmatism of the proposed procedure stems from its reliance on the tools that are routinely used in distribution systems planning and operation, and their use such that the possibilities of network sterilization are avoided. The tools involved include: long-term load forecasting, long-term planning of network extension/reinforcement, network reconfiguration, and power flow. Network sterilizing substations are identified through repeated power flow computations. The proposed procedure is supported by results using an artificially created 5-bus test system, the IEEE 33-bus test system, and a part of real-life distribution system of ORES (a Belgian DSO serving a large portion of the Walloon region in Belgium). [less ▲]

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See detailTest systems for voltage stability analysis and security assessment
Van Cutsem, Thierry ULiege; Glavic, Mevludin ULiege; Rosehart, William et al

Report (2015)

This report documents the work of the IEEE PES Task Force on Test Systems for Voltage Stability Analysis and Security Assessment. The report starts with a short introduction about the motivation and the ... [more ▼]

This report documents the work of the IEEE PES Task Force on Test Systems for Voltage Stability Analysis and Security Assessment. The report starts with a short introduction about the motivation and the scope of the work. Next, the models of respectively the Nordic and the RVS test systems are presented in detail, together with a sample of long-term dynamic simulations of their responses to large disturbances. Appendices are devoted to complementary analyses and simulation results obtained with other time-domain simulation software. The system data and a sample of representative outputs are available on a Web site maintained by the Dynamic Security Assessment Working Group of the Power System Dynamic Performance Committee (please refer to http://ewh.ieee.org/soc/pes/psdpc/index.htm for more information). [less ▲]

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See detailHybrid processing of SCADA and synchronized phasor measurements for tracking network state
Alcaide-Moreno, Boris; Fuerte-Esquivel, Claudio; Glavic, Mevludin ULiege et al

in Proc. IEEE PES General Meeting (2015, July)

This paper proposes a new tracking state estimator aimed at following some of the dynamics of the network state (bus voltage phasors) by a hybrid processing of SCADA and synchronized phasor measurements ... [more ▼]

This paper proposes a new tracking state estimator aimed at following some of the dynamics of the network state (bus voltage phasors) by a hybrid processing of SCADA and synchronized phasor measurements. The latter are assumed to be available in limited number. To avoid time skew effects, only the SCADA measurements received since the last execution of the estimator are processed. To ensure observability, estimated SCADA measurements are used as pseudo-measurements. The procedure includes a prediction, an innovation analysis and a correction step. The latter consists of solving a constrained least-squares optimization. The simulation results refer to a test system undergoing large disturbances, evolving to long-term voltage instability or stabilized by emergency control. The proposed method appears to satisfactorily track the overall network evolution, even during those severe conditions. [less ▲]

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See detailA new formulation of state estimation in distribution systems including demand and generation states
Rousseaux, Patricia ULiege; Toubeau, Jean-François; De Grève, Zacharie et al

in proceeedings of the 2015 Power Tech conference (2015, June)

Distribution system state estimation faces a major difficulty: the lack of real-time measurements. This imposes to add information, usually pseudo-measurements from historical data. This paper proposes a ... [more ▼]

Distribution system state estimation faces a major difficulty: the lack of real-time measurements. This imposes to add information, usually pseudo-measurements from historical data. This paper proposes a different, novel formulation of state estimation relying on the classification of loads into components (e.g. residential, commercial, etc.) and accounting for dispersed generation. The approach “by-passes” the use of pseudo-measurements by expressing the medium-voltage bus injections as functions of a small number of active power components at low-voltage level, treated as additional state variables. The injections at medium-voltage buses become equality constraints. A procedure to identify the above functions is detailed, which takes advantage of data collected by smart meters. [less ▲]

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