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  • Thierry Van Cutsem
Thierry Van Cutsem

Thierry Van Cutsem
University of Liège | ulg · Department of Electrical Engineering and Computer Science - Montefiore Institute

Electrical-Mechanical Engineer - Doctor in Applied Sciences

About

295
Publications
99,378
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Introduction
I am a research director of the Fund for Scientific Research (FNRS) and adjunct professor at the University of Liege, Belgium I am working in the field of electric power system engineering. My research interests in this area are : - power system dynamics and stability, in particular voltage stabilty - security analysis and control - real-time control - numerical simulation (static, quasi steady-state and dynamic) - application of optimization methods.

Publications

Publications (295)
Article
This paper provides a general overview of some previously reported schemes for the on-line detection and corrective emergency control of long-term voltage instability in a power system with a significant share of Inverter-Based Generators (IBGs) connected at the distribution level. Next, it proceeds to introduce new wide-area emergency controls to...
Article
Full-text available
Dynamic state estimation (DSE) accurately tracks the dynamics of a power system and provides the evolution of the system state in real-time. This paper focuses on the control and protection applications of DSE, comprehensively presenting different facets of control and protection challenges arising in modern power systems. It is demonstrated how th...
Article
Non-negligible amounts of Distributed Generating Units (DGUs) are already connected to power systems, predominantly to medium- and low-voltage networks. The interaction between distribution and transmission systems is gaining the attention of system operators. Given the high controlability of DGUs, the active distribution networks can potentially s...
Article
Full-text available
In this paper, a reliable methodology is proposed in order to implement and validate a Model Predictive Control (MPC) scheme on an actual Voltage Source Converter (VSC) integrated in a scale-down multi-terminal DC grid. The objective of the investigated MPC controller is to enable AC frequency support among two asynchronous AC areas through a High...
Article
As the inverter-based generation replaces the conventional synchronous generators, it may also need to fill in the missing ancillary service support. One of these ancillary services is dynamic reactive power provision and voltage control. This paper analyzes optimal strategy of reactive and active fault-current support of the inverter-based generat...
Article
Full-text available
This paper deals with the derivation of dynamic equivalents of active distribution networks, hosting inverter-based generators as well as static and motor loads. Equivalents are reduced-order models for use in dynamic simulations of the transmission system. They are of the grey-box types and their parameters are identified from large-disturbance Mo...
Preprint
Full-text available
A large share of renewable energy sources integrated into the national grids and an increased interconnection capacity with asynchronous networks, are the main contributors in reducing the kinetic energy storage in the Nordic Power System. Challenges arise to operate system after a loss of generation and to minimize the offshore systems interaction...
Article
Full-text available
This report of TF on dynamic state and parameter estimation aims to 1) clearly review its motivations and definitions, demonstrate its values for enhanced power system modeling, monitoring, operation, control and protection as well as power engineering education; 2) provide recommendations to vendors, national labs, utilities and ISOs on the use of...
Article
Full-text available
Analysis of the frequency response of integrated transmission-distribution networks with deep penetration of solar photovoltaic (PV) generation faces major challenges due to the complexity emerging from dynamic models of the numerous and diverse PV units involved. This work proposes converter-based dynamic equivalent models for both distributed (di...
Preprint
Full-text available
Dynamic state estimation (DSE) accurately tracks the dynamics of a power system and provides the evolution of the system state in real-time. This paper focuses on the control and protection applications of DSE, comprehensively presenting different facets of control and protection challenges arising in modern power systems. It is demonstrated how th...
Article
Full-text available
Since the publication of the original paper on power system stability definitions in 2004, the dynamic behavior of power systems has gradually changed due to the increasing penetration of converter interfaced generation technologies, loads, and transmission devices. In recognition of this change, a Task Force was established in 2016 to re-examine a...
Article
Full-text available
This survey paper discusses the fundamentals of power systems modelling in the presence of large amounts of converter-interfaced generation (CIG). By referring to real-life events characterised by anomalous dynamics associated to the presence of CIG, the concepts of narrow versus broad band signals are first recalled along with the limitation of th...
Article
As more Distributed Generation Units (DGUs) are integrated into medium–voltage grids, the interaction between transmission and distribution networks plays a higher role in power system security. The contribution of the so-called Active Distribution Networks (ADNs) to system stability is expected to become more and more significant. This paper focus...
Article
Full-text available
This is the Online Appendix of the paper entitled ""Frequency Response from Solar PV: A Dynamic Equivalence Closed-Loop System Identification Approach." The paper is now under review in the IEEE Systems Journal for the second round of review. The manuscript ID is ISJ-RE-20-10130.
Preprint
Full-text available
This paper presents a methodology to derive a reduced-order, "grey-box" model of an active distribution network. This dynamic equivalent is intended for dynamic simulations of large disturbances taking place in the transmission system. To deal with the uncertainty affecting dynamic model parameters, Monte-Carlo simulations are used, and the paramet...
Conference Paper
In this paper, strategies for a holistic integration of multiple HVDC links into existing power systems are presented. High Voltage Direct Current (HVDC) links can support the operation of AC grids on different timescales. Contrary to AC transmission lines, the power flow on HVDC links can be freely controlled. Due to their ability of rapidly contr...
Conference Paper
The Frequency Containment Reserve (FCR) one of the balancing actions to keep the frequency within acceptable limits. The objective of the FCR (also known as primary control) is to stabilize the system frequency within a short time interval after a disturbance. Related to that, maximum steady-state frequency deviation and maximum Instantaneous Frequ...
Conference Paper
Full-text available
This survey paper discusses the fundamentals of power systems modelling in the presence of large amounts of converter-interfaced generation (CIG). By referring to real-life events characterised by anomalous dynamics associated to the presence of CIG, the concepts of narrow versus broad band signals are first recalled along with the limitation of th...
Preprint
Full-text available
In 2017, Energinet and TenneT, the Danish and Dutch Transmission System Operators (TSOs), have announced the North Sea Wind Power Hub (NSWPH) project. The project aims at increasing by 36 GW the North Sea offshore wind capacity, with an artificial island collecting all the power produced by wind turbines and several HVDC links transmitting this pow...
Article
Full-text available
A reduced-order“, grey-box” model of an active distribution network, intended for dynamic simulations of the transmission system, is derived. The network hosts inverter-based generators as well as static and motor loads, whose dynamic parameters are affected by uncertainty. This issue is addressed using Monte-Carlo simulations. The parameters of th...
Technical Report
A task force set up jointly by IEEE Power System Dynamic Performance (PSDP) Committee and CIGRE had addressed the issue of stability definition and classification in power systems from a fundamental viewpoint and had closely examined the practical ramifications. The relevant report published in 2004, primarily dealt with fairly slow, electromechani...
Article
This paper describes the two test systems for voltage stability studies set up by the IEEE PES Task Force on “Test Systems for Voltage Stability Analysis and Security Assessment” under the auspices of the Power System Stability Subcommittee of the Power System Dynamic Performance Committee. These systems are based on previous test systems, making t...
Conference Paper
Full-text available
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 sta...
Conference Paper
Full-text available
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 gen...
Article
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 Reco...
Conference Paper
Full-text available
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 equivalen...
Conference Paper
Full-text available
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 para...
Conference Paper
Full-text available
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 co...
Technical Report
Full-text available
The Technical Brochure (TB) provides guidance on the selection of appropriate Inverter- Base Generation (IBG) models and the required characteristics/functions that should be represented. Model structure and functionality are described in terms of the type of dynamic study to be undertaken and the general characteristics of the associated power sys...
Data
In order to obtain the full text, please see the instruction file, "e-cigre_Publication_TB727.pdf" This Technical Brochure provides a guidance on inverter-based generator models with associated functions that should be used for specific phenomena such as frequency deviation, large voltage deviation and long-term voltage deviation. This guideline h...
Technical Report
Full-text available
The objective of this CIGRE and CIRED Joint Working Group is to review and report on the latest developments relating to Inverter Based-Generation (IBG) modelling for power system dynamic studies. The scope has included both large-scale IBGs connected to a single point of common coupling at the transmission level as well as distributed IBGs on the...
Technical Report
Full-text available
The objective of this CIGRE and CIRED Joint Working Group (JWG C4/C6.35/CIRED) is to review and report on the latest developments relating to Inverter Based-Generation (IBG) modelling for power system dynamic studies. The scope has included both large-scale IBGs connected to a single point of common coupling at the transmission level as well as dis...
Article
Full-text available
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...
Chapter
The increasing penetration of distributed energy sources at distribution level is expected to create temporary over/under voltages and/or thermal overloads in distribution networks (DNs). This chapter presents robust DN corrective control for temporary over/under voltages and thermal overloads as an alternative to network reinforcements. It introdu...
Chapter
This chapter demonstrates how advanced distribution network (DN) control schemes, and in particular volt-var control (VVC), can affect the long-term voltage stability of transmission networks (TNs). It introduces some basic notions of long-term voltage stability, necessary to understanding and analyzing the impact of VVCs at distribution and transm...
Article
Full-text available
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 u...
Article
Full-text available
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 iden...
Article
Full-text available
This paper proposes a novel tracking state estimator to process both fast-rate synchronized phasor and slow-rate supervisory control and data acquisition (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 executio...
Conference Paper
Full-text available
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 respo...
Conference Paper
This paper proposes a novel control scheme for frequency support among asynchronous AC areas through HVDC grids. It is based on local controllers, each acting on a voltage source converter, using locally available measurements only, and supporting frequency of the adjacent AC area after a significant disturbance. The controller is combined with the...
Conference Paper
Full-text available
This paper presents a novel approach, which identifies a buffer zone around a given study system and replaces the external system with an equivalent. The aim is to obtain a reduced system, which is suitable for assessment of long-term voltage and frequency dynamics in the study system. First, the proposed methodology ensures that all components, wh...
Article
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. Th...
Article
This paper presents a novel equivalent, which is suitable for simulation of inertial and primary frequency control effects. In the model reduction procedure, dynamic power injectors are used to replace the external system and to mimic its dynamic behavior. The parameters of the equivalents are tuned with a simple approach presented in this paper. T...
Article
Full-text available
Over the last decades, dynamic simulations have become indispensable to anyone involved in power system security analysis. With the sudden integration of the renewable energy sources (RES) in the network, the need for more accurate and validated dynamic models is getting higher. While significant efforts have been made in the past for the documenta...
Article
Full-text available
This paper proposes a novel control scheme for provision of frequency support among asynchronous AC areas through HVDC grids. It is based on local controllers, each acting on a voltage source converter, using local measurements only, and supporting frequency of the adjacent AC area after a significant disturbance. The new discrete control is combin...
Technical Report
Full-text available
The penetration of Distributed Energy Resources (DER) within the Distribution Network (DN) increases worldwide. This increase of local generation has led to various changes in the philosophy of DN operation. The changing nature (higher participation of power electronic components) of connected system loads and distributed generation (DG) is creatin...
Article
Full-text available
A coordinated supervisory control scheme for future multi-terminal High-Voltage Direct-Current (HVDC) grids is proposed. The purpose is to supervise the grid and take appropriate actions to ensure power balance and prevent or remove voltage or current limit violations. First, using DC current and voltage measurements, the power references of the va...
Article
Abstract This paper presents a local long-term voltage instability monitoring method, which is suitable for on-line applications. The proposed extended-time Local Identification of Voltage Emergency Situations (eLIVES) method is a significantly modified version of the previously presented LIVES method. The new method is not bound to assessing syste...
Article
As the need for faster power system dynamic simulations increases, it is essential to develop new algorithms that exploit parallel computing to accelerate those simulations. This paper proposes a parallel algorithm based on a two-level, Schur complement-based, domain decomposition method. The two-level partitioning provides high parallelization pot...
Conference Paper
Full-text available
This paper focuses on simplified models of the Modular Multilevel Converter suitable for large-scale dynamic studies, in particular simulations under the phasor approximation. Compared to the existing literature, this paper does not a priori adopt the modeling approach followed for the original two-level or three-level Voltage Source Converter. On...
Conference Paper
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 a...
Conference Paper
An improved Thevenin 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...
Article
In this paper, the overvoltage problems that might arise from the integration of photovoltaic panels into low-voltage distribution networks is addressed. A distributed scheme is proposed that adjusts the reactive and active power output of inverters to prevent or alleviate such problems. The proposed scheme is model-free and makes use of limited co...
Article
Co-simulation opens new opportunities to combine mature ElectroMagnetic Transients (EMT) and Phasor-Mode (PM) solvers, and take advantage of their respective high accuracy and execution speed. In this paper, a relaxation approach is presented, iterating between an EMT and a PM solver. This entails interpolating over time the phasors of the PM simul...
Article
Full-text available
Существующие мировые тенденции, характеризующиеся увеличением объемов вне- дрения различных технологий генерации с использованием преобразовательной тех- ники (преобразователей), в том числе на основе возобновляемых источников энергии (далее – ВИЭ), существенно различающихся по типу и номинальной мощности, приво- дят к необходимости решения актуаль...
Article
Full-text available
Hydro-Québec has a long interest in on-line Dynamic Security Assessment (DSA) driven by its challenging system dynamics. Presently, off-line calculated security limits are combined with an on-line monitoring system. However, new developments in dynamic simulation enable real-time or near-real-time DSA calculations and transfer limits determination....
Article
Simulating a power system with both transmission and distribution networks modeled in detail is a huge computational challenge. In this paper, a Schur-complement-based domain decomposition algorithm is proposed to provide accurate, detailed dynamic simulations of such systems. The simulation procedure is accelerated with the use of parallel program...
Article
Full-text available
A case study dealing with long-term voltage instability in systems hosting active distribution networks is reported in this paper. It anticipates future situations with high penetration of dispersed generation, where the latter are used to keep distribution voltages within desired limits, in complement to load tap changers. The interactions between...
Conference Paper
Full-text available
Hydro-Québec has a long interest in on-line Dynamic Security Assessment (DSA) driven by its challenging power network dynamics (angle, frequency and voltage stability, short and long-term dynamics). At the moment, off-line calculated security indicators are combined with an on-line monitoring system to ensure the security of the system. However, ne...