References of "Van Cutsem, Thierry"
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See detailDynamic equivalent of an active distribution network taking into account model uncertainties
Chaspierre, Gilles ULiege; Denis, Guillaume; Panciatici, Patrick et al

in Proc. IEEE PES PowerTech conference (in press)

A reduced-order model of a distribution network hosting inverter-based generators is derived. This model aims to be used in dynamic simulations of large disturbances in the transmission system ... [more ▼]

A reduced-order model of a distribution network hosting inverter-based generators is derived. This model aims to be used in dynamic simulations of large disturbances in the transmission system. Uncertainties affecting the parameters of the component models are addressed using Monte-Carlo simulations. For a given disturbance, the average and the standard deviation of the randomized system evolutions are extracted. The dynamic equivalent is of the “grey-box” type. Its parameters are adjusted to match as closely as possible the average system response. This involves minimizing a weighted least-square objective function, in which the weights reflect the dispersion of the randomized Monte-Carlo responses. Multiple disturbances are considered to avoid over-fitting, and a recursive procedure is used to select a small subset of them from which the parameters of the ADN equivalent are identified. Simulations results are reported on the CIGRE MV distribution network benchmark. They show a good accuracy of the equivalent. [less ▲]

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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 detailIdentification of a Dynamic Equivalent of an Active Distribution Network from Monte-Carlo Simulations
Chaspierre, Gilles ULiege; Denis, Guillaume; Panciatici, Patrick et al

in Proc. 8th Solar Integration Workshop (in press)

This paper deals with the derivation of a dynamic equivalent of a distribution system for use in (phasor-mode) dynamic simulations of large disturbances in the transmission system. The original, unreduced ... [more ▼]

This paper deals with the derivation of a dynamic equivalent of a distribution system for use in (phasor-mode) dynamic simulations of large disturbances in the transmission system. The original, unreduced system hosts inverter-based generators such as photovoltaic units or full-converter wind turbines. The individual behaviour of inverter-based generators and loads is assumed to be reasonably well captured by a parameterized model, but the values of its parameters are uncertain. Monte-Carlo simulations involving random variations of those parameters are performed, yielding a set of dynamic responses to a given large disturbance. The equivalent is of the ”grey-box” type and its parameters are tuned in the least-square sense to have its response falling in time-varying confidence intervals obtained from the 5-th and the 95-th percentiles of the distribution of dynamic responses. Simulations results are reported on a variant of the CIGRE Medium-Voltage Distribution Network Benchmark. [less ▲]

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See detailDynamic Equivalent of a Distribution Grid Hosting Dispersed Photovoltaic Units
Chaspierre, Gilles ULiege; Panciatici, Patrick; Van Cutsem, Thierry ULiege

in IREP’2017 Symposium: X Bulk Power Systems Dynamics and Control Symposium (in press)

This paper deals with the derivation of a simplified model of a distribution network hosting dispersed photovoltaic units. The model is aimed at short-term dynamic simulations of a transmission grid in ... [more ▼]

This paper deals with the derivation of a simplified model of a distribution network hosting dispersed photovoltaic units. The model is aimed at short-term dynamic simulations of a transmission grid in response to large disturbances. In a first step, a generic dynamic model of a photovoltaic unit is proposed, focusing on its interactions with the grid, in particular the controls triggered by voltage disturbances. The model takes into account various present and near-future grid codes. In a second step, a dynamic equivalent is derived accounting for the distribution network, the dispersed photovoltaic units, as well as static and dynamic (motor) loads. This equivalent is of the “grey-box” type and its parameters are tuned in the least-square sense to match the dynamic response of the original, unreduced system. Simulation results are reported on a detailed 913-bus distribution system subject to faults at transmission level. [less ▲]

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See detailControl of Photovoltaic Systems for Enhanced Short-Term Voltage Stability and Recovery
Lammert, Gustav; Premm, Daniel; Pabon Ospina, Luis David et al

in IEEE Transactions on Energy Conversion (2019), 34

This paper investigates the impact of: i) the Low Voltage Ride-Through (LVRT) and Dynamic Voltage Support (DVS) capability; ii) the active current recovery rate; iii) the local voltage control; and iv ... [more ▼]

This paper investigates the impact of: i) the Low Voltage Ride-Through (LVRT) and Dynamic Voltage Support (DVS) capability; ii) the active current recovery rate; iii) the local voltage control; and iv) the plant-level voltage control of large-scale PhotoVoltaic (PV) systems on Short-Term (ST) voltage stability and Fault-Induced Delayed Voltage Recovery (FIDVR). Moreover, the influence on transient and frequency stability is studied briefly. To evaluate FIDVR, a novel metric, the so-called Voltage Recovery Index (VRI), is defined. The studies are performed with the WECC generic PV system model on an IEEE voltage stability test system, namely the Nordic test system. The results show that without LVRT capability the system is ST voltage and transient unstable. Only the LVRT and DVS capability help to avoid ST voltage and transient instability. Considering voltage and frequency dynamics, an active current recovery rate of 100 %/s shows the best performance. To further enhance voltage dynamics, plant-level voltage control together with local coordinated reactive power/voltage control should be applied. Moreover, the VRI provides useful information about the FIDVR and helps to compare different ST voltage controls. [less ▲]

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See detailExperimental Validation of a Model Predictive Control Strategy on a Three-terminal VSC-HVDC Mock-up
Belhaouane, Mohamed-Moez; Almaksour, Khaled; Papangelis, Lampros ULiege et al

in Proceedings of the 15th IET International Conference on AC and DC Power Transmission (ACDC 2019) (2019)

The subject of this paper is the experimental validation of a recently proposed advanced control scheme for Voltage Source Converters (VSC) based on Model Predictive Control (MPC). The main purpose of the ... [more ▼]

The subject of this paper is the experimental validation of a recently proposed advanced control scheme for Voltage Source Converters (VSC) based on Model Predictive Control (MPC). The main purpose of the investigated advanced controller is the frequency support from an AC grid to another after significant disturbance through HVDC Grid. The paper reports on the implementation methodology on a small-scale 3-terminal DC mock-up grid consisting of several physical low-scale VSCs, actual DC cables. These components are coupled with real-time simulation tools simulating the adjacent AC grids. The different steps for the validation process of the MPC strategy are illustrated, starting from offline simulation based on a model of the DC grid, up to the actual implementation of the controller in the mock-up of the DC grid. [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 detailStability of a Voltage Source Converter subject to Decrease of Short-Circuit Capacity: a Case Study
Papangelis, Lampros ULiege; Debry, Marie-Sophie; Prevost, Thibault et al

in Proceedings of the 20th PSCC (2018, June)

The subject of this paper is the investigation of the stability of a Voltage Source Converter (VSC) undergoing a sudden decrease of the Short Circuit Capacity of the AC system to which it is connected. A ... [more ▼]

The subject of this paper is the investigation of the stability of a Voltage Source Converter (VSC) undergoing a sudden decrease of the Short Circuit Capacity of the AC system to which it is connected. A case study is reported on a simple system including an HVDC terminal and a Thévenin equivalent. First, a small-signal stability analysis is performed showing that the PLL-based vector control may become unstable at powers lower than the theoretical static stability limit. Dynamic simulations demonstrate that the stability limit may further decrease depending on the disturbance. The need for a fast instability detection method is highlighted. [less ▲]

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See detailDecentralized Model Predictive Control of Voltage Source Converters for AC Frequency Containment
Papangelis, Lampros ULiege; Debry, Marie-Sophie; Prevost, Thibault et al

in International Journal of Electrical Power and Energy Systems (2018), 98

This paper presents a novel control scheme for exchange of frequency support between asynchronous AC systems through a High Voltage Direct Current link or grid. The proposed controller bears the spirit of ... [more ▼]

This paper presents a novel control scheme for exchange of frequency support between asynchronous AC systems through a High Voltage Direct Current link or grid. The proposed controller bears the spirit of an emergency scheme. Using only locally available measurements, each converter can identify emergency situations that could potentially lead to unacceptable frequency values. Then appropriate control actions are taken to restrain the frequency decline and prevent it from reaching the thresholds of load shedding relays. Inspired of Model Predictive Control, the method uses simplified models of the AC and DC sides of the converter, and can incorporate various constraints. The effectiveness of the method is demonstrated on a test system consisting of two asynchronous AC areas interconnected through a five-terminal HVDC grid. [less ▲]

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See detailIdentification of a Reduced-Order Model of an Active Distribution Grid Using Recursive Training
Chaspierre, Gilles ULiege; Van Cutsem, Thierry ULiege

in Chaspierre, Gilles; Van Cutsem, Thierry (Eds.) Proc. of the IEEE Benelux Young Researchers Symposium (2018, May)

THIS PAPER WAS PRESENTED BY GILLES CHASPIERRE AT A LOCAL SYMPOSIUM WHERE PHD STUDENTS HAVE THE OPPORTUNITY TO PRESENT THEIR RESEARCH WORK. AN UPDATED AND MORE COMPREHENSIVE VERSION HAS BEEN SUBMITTED FOR ... [more ▼]

THIS PAPER WAS PRESENTED BY GILLES CHASPIERRE AT A LOCAL SYMPOSIUM WHERE PHD STUDENTS HAVE THE OPPORTUNITY TO PRESENT THEIR RESEARCH WORK. AN UPDATED AND MORE COMPREHENSIVE VERSION HAS BEEN SUBMITTED FOR PRESENTATION AT THE IEEE PES 2019 POWERTECH CONFERENCE, MILAN. [less ▲]

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See detailAgent-based Identification and Control of Voltage Emergency Situations
Robitzky, Lena; Weckesser, Tilman; Häger, Ulf et al

in IET Generation, Transmission and Distribution (2018), 12(6), 14461454

Changing dynamics of power systems caused by the migration from conventional to distributed energy sources increase the risk of blackouts due to voltage instability, especially in case of unforeseen ... [more ▼]

Changing dynamics of power systems caused by the migration from conventional to distributed energy sources increase the risk of blackouts due to voltage instability, especially in case of unforeseen network conditions (e.g., (N-k)-cases). To enable a both secure and efficient power supply, novel monitoring and emergency control systems for the identification of voltage emergency situations as well as the execution of control actions are required that react reliably in due time and adaptively in case of changing network situations. This paper presents a distributed agent-based approach to counteract voltage instability that is based solely on local measurements and limited inter-agent communication. Distributed agents located at substations in the (sub-)transmission network monitor distribution and transmission voltages as well as load tap changer positions and are able to autonomously curtail load in case system stability is endangered. The applicability of the approach is demonstrated in a co-simulation environment interfacing the multi-agent system with a dynamic power system simulation. The presented approach allows for an early detection of voltage instability as well as a coordinated execution of available control actions. [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 detailEnhancement of Transmission System Voltage Stability through Local Control of Distribution Networks
Valverde, Gustavo; Aristidou, Petros; Van Cutsem, Thierry ULiege

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

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See detailIndustrial Recommendation of Modeling of Inverter Based Generators for Power System Dynamic Studies with Focus on Photovoltaic
Yamashita, Koji; Renner, Herwig; Martınez Villanueva, Sergio et al

in IEEE Power and Energy Technology Systems Journal (2018), 5(1), 1-10

Dynamic simulations have played an important role in assessing the power system dynamic studies. The appropriate numerical model is the key to obtain correct dynamic simulation results. In addition, the ... [more ▼]

Dynamic simulations have played an important role in assessing the power system dynamic studies. The appropriate numerical model is the key to obtain correct dynamic simulation results. In addition, the appropriate model including the selection of the individual model component (such as protections, controls and capabilities) is different depending on the type of phenomena to be observed or examined. However, the proper selection of the model is not an easy task especially for Inverter Based Generators (IBGs). Considerable industry experience concerning power system dynamic studies and the dynamics of the IBGs is required for the proper selection of the IBG model. The established CIGRE C4/C6.35/CIRED Joint Working Group (JWG) has gathered a wide variety of experts which fully cover the required industry experience. The JWG provides the guidance on the model selection for analyzing the phenomena such as frequency deviation, large voltage deviation, and long-term voltage deviation, individually. This helps to reduce the computational burden as well as it clarifies the required characteristics/ functions that should be represented for the power system dynamic studies with the IBGs. [less ▲]

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See detailCombined Local and Centralized Voltage Control in Active Distribution Networks
Soleimani Bidgoli, Hamid ULiege; Van Cutsem, Thierry ULiege

in IEEE Transactions on Power Systems (2018), 33(2), 1374-1384

A two-level real-time voltage control scheme is proposed to keep voltages within specified limits in distribution grids using Distributed Generation Units (DGUs). It combines a local and a centralized ... [more ▼]

A two-level real-time voltage control scheme is proposed to keep voltages within specified limits in distribution grids using Distributed Generation Units (DGUs). It combines a local and a centralized control of their reactive powers. The local control provides fast response after a disturbance, reducing its impact and enhancing voltage quality. The centralized control uses measurements collected throughout the network to bring the voltages inside tighter limits and balance the various DGU contributions. To this purpose, it adjusts in a coordinated way their reactive power set-points, taking into account the local controls. This discrete control solves at each time step a multi-time-step constrained optimization inspired of Model Predictive Control. The method effectiveness is demonstrated on a 75-bus test system hosting 22 DGUs. [less ▲]

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See detailElectric Power Network State Tracking from Multirate Measurements
Alcaide-Moreno, Boris; Fuerte-Esquivel, Claudio; Glavic, Mevludin et al

in IEEE Transactions on Instrumentation and Measurement (2018), 67

This paper proposes a novel tracking state estimator to process both fast-rate synchronized phasor and slow rate SCADA measurements. The former are assumed to be in limited number. The latter are ... [more ▼]

This paper proposes a novel tracking state estimator to process both fast-rate synchronized phasor and slow rate SCADA measurements. The former are assumed to be in limited number. The latter are exploited as and when they arrive to the control center. In order to restore observability, after each execution of the tracking state estimator, forecasted SCADA measurements are used as pseudo-measurements in the next estimation. An event detection analysis allows assessing if the system is in quasi steady-state. If so, an innovation analysis is performed to identify and eliminate erroneous SCADA measurements. The system state is computed by Hachtel’s augmented matrix method. The option of exploiting time-tagged SCADA measurements is also considered. The method is illustrated through detailed dynamic simulations of a test system evolving towards voltage collapse, with and without emergency control. [less ▲]

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See detailModelling Active Distribution Networks under Uncertainty: Extracting Parameter Sets from Randomized Dynamic Responses
Chaspierre, Gilles ULiege; Panciatici, Patrick; Van Cutsem, Thierry ULiege

in Proceedings of the 20th Power Systems Computation Conference (2018)

This paper deals with the dynamic modelling of distribution systems hosting a large amount of Inverter-Based Generators (IBGs), more precisely their response to large disturbances in the transmission ... [more ▼]

This paper deals with the dynamic modelling of distribution systems hosting a large amount of Inverter-Based Generators (IBGs), more precisely their response to large disturbances in the transmission system. It is assumed that the individual behaviour of IBGs and loads is reasonably well captured by a parameterized model, but the values of its parameters are uncertain. Monte-Carlo simulations involving random variations of those parameters are performed. The dynamic response closest to the average is extracted as being representative. A simple procedure is described to stop the simulations as soon as sufficient information is available. Detailed simulation results are provided, relative to a distribution grid with 75 loads and 75 IBGs. The latter are represented by a generic model that reproduces the main requirements of typical grid codes. [less ▲]

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See detailAggregated Dynamic Equivalent of a Distribution System hosting Inverter-based Generators
Chaspierre, Gilles ULiege; Panciatici, Patrick; Van Cutsem, Thierry ULiege

in Proceedings of the 20th Power Systems Computation Conference (2018)

An equivalent, i.e. a reduced-order model, of active distribution networks is derived, for use in (phasor-mode) dynamic simulations of large-disturbances. In the unreduced model, the network hosts a large ... [more ▼]

An equivalent, i.e. a reduced-order model, of active distribution networks is derived, for use in (phasor-mode) dynamic simulations of large-disturbances. In the unreduced model, the network hosts a large number of inverter-based generators, responding to the disturbances in accordance with recent or near-future grid codes. The aggregated equivalent is of the “grey-box” type and its parameters are tuned in the least-square sense to match the dynamic responses of the unreduced system to several training disturbances. Changes in operating point are easily reflected when initializing the reduced model. Simulations are reported on a detailed 75-bus distribution system. The accuracy of the equivalent has been checked with respect to untrained disturbances and changes of the operating point. [less ▲]

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See detailIdentifying Plausible Harmful N-k Contingencies: A Practical Approach based on Dynamic Simulations
Weckesser, Tilman; Van Cutsem, Thierry ULiege

in Proceedings of the 20th Power Systems Computation Conference (2018)

This paper presents a practical search algorithm using detailed dynamic simulations to identify plausible harmful N 􀀀 k contingency sequences. Starting from an initial list of contingencies ... [more ▼]

This paper presents a practical search algorithm using detailed dynamic simulations to identify plausible harmful N 􀀀 k contingency sequences. Starting from an initial list of contingencies, progressively more severe contingency sequences are investigated. For that purpose, components, which violated conservative protection limits during a N - k contingency simulation are identified and considered as candidate k+1-th contingencies, since these could be tripped due to a hidden failure. This approach takes into account cascading events, such as over- or under-speed generator tripping, which are considered to be part of the system response. The implementation of the proposed algorithm into a parallel computing environment and its performance are demonstrated on the IEEE Nordic test system. [less ▲]

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See detailSearching for Plausible N-k Contingencies Endangering Voltage Stability
Weckesser, Johannes ULiege; Van Cutsem, Thierry ULiege

in IEEE International Conference on Innovative Smart Grid Technologies IEEE ISGT Europe 2017, Turin 26-29 September 2017 (2018)

This paper presents a novel search algorithm using time-domain simulations to identify plausible N-k contingencies endangering voltage stability. Starting from an initial list of disturbances ... [more ▼]

This paper presents a novel search algorithm using time-domain simulations to identify plausible N-k contingencies endangering voltage stability. Starting from an initial list of disturbances, progressively more severe contingencies are investigated. After simulation of a N-k contingency, the simulation results are assessed. If the system response is unstable, a plausible harmful contingency sequence has been found. Otherwise, components affected by the contingencies are considered as candidate next event leading to N-(k+1) contingencies. This implicitly takes into account hidden failures of component protections. The performance of the proposed search algorithm is compared to a brute-force algorithm and demonstrated on the IEEE Nordic test system. [less ▲]

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