References of "Van Cutsem, Thierry"
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See detailEmergency support of transmission voltages by active distribution networks: a non-intrusive scheme
Pabon Ospina, Luis David; Van Cutsem, Thierry ULiege

in IEEE Transactions on Power Systems (in press)

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 ... [more ▼]

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 support the transmission system during emergency situations. Previously proposed voltage emergency controls involving distribution network assets focused on preserving the transmission system integrity, even if it implies affecting the distribution system operation (intrusive schemes). More attention needs to be devoted to supporting transmission voltages, while preserving the distribution network operation (non-intrusive schemes). This paper introduces a new adaptive and non-intrusive voltage emergency control scheme based on the synchronization of DGUs and the load tap changer of the corresponding distribution transformer. The conclusions are derived from time-domain simulations using an extended version of the IEEE Nordic test system for voltage stability assessment. [less ▲]

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See detailDynamic equivalent of a real distribution grid hosting photovoltaic and synchronous generators
Chaspierre, Gilles ULiege; Ghazavi Dozein, Mehdi; Denis, Guillaume et al

in CIGRE Science and Engineering (2021)

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 ... [more ▼]

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 parameters of the equivalent are adjusted to match as close as possible the average randomized system responses. To avoid over-fitting, multiple disturbances are considered; they are automatically selected among a set of candidates. Moreover, to reduce the computational burden, only parameters with significant impact are adjusted in the identification procedure. Simulation results are reported on a real Australian distribution grid. The latter hosts synchronous generators and residential photovoltaic units. Its loads are modelled with a static and a motor part. [less ▲]

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See detailFrequency Response from Solar PV: A Dynamic Equivalence Closed Loop System Identification Approach
Dozein, Mehdi Ghazavi; Chaspierre, Gilles ULiege; Mancarella, Pierluigi et al

in IEEE Systems Journal (2021)

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 ... [more ▼]

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 (distribution network-connected) and large-scale (transmission network-connected) PV units which take into account practical issues such as measurement and coordination delays. Differently from previous work that adopted open-loop identification, the unknown model parameters are identified here through a novel closed-loop identification process based on least-square minimization. This allows capturing the continuous interaction between system and PV responses, thus improving the outcome of the overall frequency response model. The proposed models are validated with real data from the August 2018 separation event in Australia. The results demonstrate the excellent performance of the proposed models in determining the frequency response from PV in both transmission and distribution networks, hence paving the way to its adoption in frequency stability analysis in low-carbon grids dominated by frequency-responsive renewables. [less ▲]

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See detailThe multiDC project: Research Towards a Holistic Integration of HVDC Links into Large-Scale AC Power Systems
Weckesser, Tilman; Misyris, Georgios; Obradovic, Danilo et al

Scientific conference (2020, September 14)

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 ... [more ▼]

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 controlling the power transmitted, they can help to stabilize the dynamic system response of interconnected power systems, e.g. providing fast frequency response. Moreover, they can be an important tool in controlling and in optimizing the operation of interconnected power system. In this paper, different strategies are presented, then their benefits and potential challenges are discussed. [less ▲]

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See detailTest Systems for Voltage Stability Studies
Van Cutsem, Thierry ULiege; Glavic, Mevludin ULiege; Rosehart, William et al

in IEEE Transactions on Power Systems (2020), 35(5), 4078-4087

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 ... [more ▼]

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 them more representative of voltage stability constraints. A set of representative results are provided for both systems, with emphasis on dynamic simulation. They illustrate various aspects such as long-term dynamics, voltage security assessment, real-time detection, and corrective control of instabilities. The value for educators, researchers and practitioners are emphasized. [less ▲]

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See detailAssessment of HVDC Frequency Control Methods in the Nordic Test System
Obradovic, Danilo; Dijokas, Matas; Van Cutsem, Thierry ULiege et al

in Proc. CIGRE conference (2020, August)

The Frequency Containment Reserve (FCR) is 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 ... [more ▼]

The Frequency Containment Reserve (FCR) is 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 Frequency Deviation (IFD) are defined. With higher integration of renewable energy sources, power systems will reduce its impact on pollution, but face much more often with low inertia scenarios. With low inertia values, the system decreases its inherent property to react to large power disturbances. In these cases, IFD is profoundly affected, and there is a need for fast and cost-effective solutions. High Voltage Direct Current (HVDC) links with appropriate control strategies may be a potential solution for the challenge mentioned above. According to current system requirements, HVDC links must be capable of providing frequency support. Several studies analyzed the impact of FCR action via HVDC systems with various control methods. However, the question is which of these methods has the best properties in terms of reliability, robustness, and cost-effectiveness. This work investigates and applies two control methods for HVDC frequency support in the Nordic test system, where these actions are referred to as Emergency Power Control (EPC). The first EPC method is currently used in the Nordic Power System (NPS), and it is based on ramp power injections and frequency triggering activations. The second one is a frequency droop based EPC, and this work proposes it as a new method for future EPC operation. This work assesses the comparison between the two EPC methods for two different disturbances and with the same EPC power capacities. The main objective of the EPC is to meet the frequency requirements and avoid any negative interactions. The Nordic test system has been designed and tuned by authors to capture the frequency dynamical response of the NPS. Furthermore, an equivalent single machine model with low inertia is used to study the performance of the frequency droop based EPC. [less ▲]

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See detailPower Factor Improvement by Active Distribution Networks During Voltage Emergency Situations
Pabon Ospina, Luis David; Van Cutsem, Thierry ULiege

in Electric Power Systems Research (2020, August)

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 ... [more ▼]

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 focuses on long-term voltage stability issues and shows that, contrary to what might be expected, a mere reactive power injection by DGUs has detrimental effects on system stability and might bring along counterproductive effects that precipitate voltage instability and collapse. Hence, an alternative control scheme for power factor improvement by ADNs during voltage emergency situations is proposed. The power factor is measured at the point of common coupling between transmission and distribution networks. The controller enhances system stability and eliminates the identified counterproductive effects. The conclusions are derived from time-domain simulations of a very simple, but concept-friendly, 5-bus system. [less ▲]

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See detailNorth Sea Wind Power Hub: System Configurations, Grid Implementation and Techno-economic Assessment
Misyris, Georgios; Van Cutsem, Thierry ULiege; Moller, Jakob et al

in Proc. CIGRE conference (2020, August)

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 ... [more ▼]

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 power to the onshore grids. This project brings together new opportunities and new challenges, both from a technical and economic point of view. In this regard, this paper presents three analyses regarding the design and operation of such an offshore system. First, we perform a techno-economic assessment of different grid configurations for the collection of the power produced by wind farms and its transmission to the hub. In this analysis, two frequencies and two voltage levels for the operation of the offshore grid are investigated. Our findings show that the nominal-frequency high-voltage option is the more suitable, as low-frequency does not bring any advantage and low-voltage would results in higher costs. The second analysis is related to the differences in operating the system with low- or zero-inertia; different dynamic studies are performed for each configuration to identify proper control actions and their stability properties. Comparing the outcomes of the simulations, we observed that voltage and frequency oscillations are better damped in the zero-inertia system; however, the risk of propagating offshore faults in the connected onshore grids is mitigated with the inclusion of the synchronous condensers. Lastly, a comparison of ElectroMagnetic Transient (EMT) and phasor-mode (also known as RMS) models is presented, in order to understand their appropriateness of simulating low- and zero- inertia systems. The results show that phasor approximation modelling can be used, as long as eigen-frequencies in power network are well damped. [less ▲]

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See detailStability definitions and characterization of dynamic behavior in systems with high penetration of power electronic interfaced technologies
Hatziargyriou, Nikos; Milanović, Jovica; Rahmann, Claudia et al

Book published by IEEE (2020)

A task force set up jointly by the IEEE Power System Dynamic Performance Committee and the CIGRE Study Committee (SC) 38, currently SC C4 – System Technical Performance, had addressed in [1] the issue of ... [more ▼]

A task force set up jointly by the IEEE Power System Dynamic Performance Committee and the CIGRE Study Committee (SC) 38, currently SC C4 – System Technical Performance, had addressed in [1] the issue of stability definition and classification in power systems from a fundamental viewpoint and had closely examined the practical ramifications. At the time this document was published in 2004, the dynamic behavior of power systems was predominantly determined by the dynamic performance of synchronous generators and their controls as well as the dynamic performance of the loads. Consequently, [1] primarily dealt with fairly slow, electromechanical phenomena, typically present in power systems dominated by synchronous machines, while fast transients related to the network and other fast-response devices were considered out of scope and thus neglected. Thus, for the purposes of stability analysis in the bandwidth of interest, all fast electromagnetic transients are neglected as they typically decay rapidly [2]. Since the publication of [1], however, electric power systems worldwide have experienced a significant transformation, which has been predominantly characterized by an increased penetration of power electronic converter interfaced technologies. Among these new technologies are wind and photovoltaic generation, various storage technologies, FACTS devices, HVDC lines, and power electronic interfaced loads. With significant integration of converter interfaced generation (CIGs), loads, and transmission devices, the dynamic response of power systems has progressively become more dependent on (complex) fast-response power electronic devices, thus, altering the power system dynamic behavior. Accordingly, new stability concerns have arisen which need to be appropriately characterized, classified, and defined. This report focuses on CIG, while the effects of converter connected loads on stability are briefly discussed, where relevant. [1] P. Kundur, J. Paserba, V. Ajjarapu, G. Andersson, A. Bose, C. Cañizares, N. Hatziargyriou, D. Hill, A. Stankovic, C. Taylor, T. Van Cutsen, and V. Vittal, “Definition and classification of power system stability,” IEEE Trans. Power Syst., vol. 19, no. 3, pp. 1387–1401, May. 2004. [less ▲]

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See detailDefinition and Classification of Power System Stability – Revisited & Extended
Hatziargyriou, Nikos; Milanović, Jovica; Rahmann, Claudia et al

in IEEE Transactions on Power Systems (2020)

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 ... [more ▼]

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 and extend, where appropriate, the classic definitions and classifications of the basic stability terms to incorporate the effects of fast-response power electronic devices. This paper based on an IEEE PES report summarizes the major results of the work of the Task Force and presents extended definitions and classification of power system stability. [less ▲]

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See detailAn active Distribution Network Equivalent derived from large-disturbance Simulations with Uncertainty
Chaspierre, Gilles ULiege; Denis, Guillaume; Panciatici, Patrick et al

in IEEE Transactions on Smart Grid (2020)

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 ... [more ▼]

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 the equivalent are adjusted to match as closely as possible the average of the randomized responses, while their dispersion is accounted for through the weights of the weighted least-square minimization. A procedure is used to remove from the identification the parameters with negligible impact. To avoid over-fitting, the equivalent is tuned for multiple large-disturbance simulations. A recursive procedure is used to select the smallest possible subset of disturbances involved in the least-square minimization. Simulation results with a 75-bus MV test-system are reported. They show that the equivalent is able to reproduce with good accuracy the discontinuous controls of inverter-based generators, such as reactive current injection and tripping. [less ▲]

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See detailFundamentals of Power Systems Modelling in the Presence of Converter-Interfaced Generation
Paolone, Mario; Gaunt, Trevor; Guillaud, Xavier et al

in Electric Power Systems Research (2020)

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 ... [more ▼]

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 the meaning of apparent power, power factor and reactive power. In this regard, the adequacy of the phasor representation of voltages and currents waveforms is thoroughly discussed. Then, with respect to the central subject of control of power converters, a revised definition of grid-following and grid-forming converters is provided along with a thorough discussion of their associated controls and a comprehensive classification for both classes of converters. Several applications inspired by actual case studies are included in the paper in order to provide realistic application examples. [less ▲]

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See detailDynamic model of an active distribution network derived from multiple large-disturbance simulations
Chaspierre, Gilles ULiege; Van Cutsem, Thierry ULiege

Conference (2019, August)

Sides of a presentation by T. Van Cutsem at the panel "Experiences and insights on the use of the generic Distributed Energy Resource model (DER) in transient stability simulations" organized by the Power ... [more ▼]

Sides of a presentation by T. Van Cutsem at the panel "Experiences and insights on the use of the generic Distributed Energy Resource model (DER) in transient stability simulations" organized by the Power System Dynamic Performance Committee - Ref. 19PESGM2979 [less ▲]

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See detailModel Reduction of Active Distribution Networks under Uncertainty
Chaspierre, Gilles ULiege; Van Cutsem, Thierry ULiege

Conference (2019, August)

Slides of a presentation by T. Van Cutsem at the panel "Handling Uncertainties and Use of Equivalents in Dynamic Security Assessment" organized by the Power System Dynamic Performance Committee - Ref ... [more ▼]

Slides of a presentation by T. Van Cutsem at the panel "Handling Uncertainties and Use of Equivalents in Dynamic Security Assessment" organized by the Power System Dynamic Performance Committee - Ref. 19PESGM2190 [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 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 (2019)

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 an active distribution network taking into account model uncertainties
Chaspierre, Gilles ULiege; Denis, Guillaume; Panciatici, Patrick et al

in Proc. IEEE PES PowerTech conference (2019)

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 (2019)

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 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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