References of "Aristidou, Petros"
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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 detailContribution to Bulk System Control and Stability by Distributed Energy Resources connected at Distribution Network
Hatziargyriou, Nikos; Van Cutsem, Thierry ULiege; Milanović, Jovica et al

Report (2017)

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 ... [more ▼]

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 creating new challenges for the operation of transmission and distribution networks and DG units will be requested to provide more ancillary services. When DER reach a certain level of penetration, they have an impact on the overall steady state and dynamic performance of the bulk electric power system. Moreover, the increased power injections at the DN can cause overvoltage problems and reverse power flows that may affect the protection settings within the distribution system. A DN with high penetration of DERs responds dynamically to system disturbances and therefore affects overall power system stability and dynamic behavior. DER, when properly controlled can provide support to the upstream network by supporting the reactive power needs of the loads (at the distribution level) and flow reduction in case of congestions by supplying the demand at the distribution level. Control can be basically exercised by exploiting the power electronic converters used to interconnect most types of DER. The provision of support to transmission network (TN) operation by DER is already required by operating codes in some countries. [less ▲]

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See detailCo-simulation of Electromagnetic Transients and Phasor Models: a Relaxation Approach
Plumier, Frédéric ULiege; Aristidou, Petros; Geuzaine, Christophe ULiege et al

in IEEE Transactions on Power Delivery (2016), 31(5),

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 ... [more ▼]

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 simulation, extracting phasors from the time evolutions of the EMT simulation, and representing each sub-system by a proper multiport equivalent when simulating the other sub-system. Various equivalents are reviewed and compared in terms of convergence of the PM-EMT iterations. The paper also considers the update with frequency of the Thévenin impedances involved in the EMT simulation, the possibility to compute the EMT solution only once per time step, and the acceleration of convergence through a prediction over time of the boundary variables. Results are presented on a 74-bus, 23-machine test system, split into one EMT and one PM sub-system with several interface buses. [less ▲]

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See detailProspects of a new dynamic simulation software for real-time applications on the Hydro-Québec system
Aristidou, Petros; Lebeau, Simon; Loud, Lester et al

in CIGRE Science and Engineering (2016), 4

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 ... [more ▼]

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. In this paper, the domain-decomposition-based algorithm implemented in the simulator RAMSES is presented, along with techniques to accelerate its sequential and parallel executions. RAMSES exploits the localized response to disturbances and the timescale decomposition of dynamic phenomena to provide sequential acceleration when the simulation is performed on a single processing unit. Additionally, when more units are available, the parallelization potential of domain-decomposition methods is exploited for further acceleration. The algorithm and techniques have been tested on a realistic model of the Hydro-Québec system to evaluate the accuracy of dynamic responses and the sequential and parallel performances. Finally, the real-time capabilities have been assessed using a shared-memory parallel processing platform. [less ▲]

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See detailPower System Dynamic Simulations using a Parallel Two-level Schur-complement Decomposition
Aristidou, Petros; Lebeau, Simon; Van Cutsem, Thierry ULiege

in IEEE Transactions on Power Systems (2016), 31

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 ... [more ▼]

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 potential (coarse and fine-grained). In addition, due to the Schur-complement approach used to update the sub-domain interface variables, the algorithm exhibits high global convergence rate. Finally, it provides significant numerical and computational acceleration. The algorithm is implemented using the shared-memory parallel programming model, targeting inexpensive multi-core machines. Its performance is reported on a real system as well as on a large test system combining transmission and distribution networks. [less ▲]

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