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Mostrando ítems 1-20 de 112
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A centralized UFLS scheme using decision trees for small isolated power systems
López Larrosa, David; Sigrist, Lukas (2017-10-01)This paper presents a centralized underfrequency load-shedding (UFLS) scheme using a decision tree to decide whether and how much load needs to be shed. UFLS schemes play an important role in protecting the integrity of ... -
A communication-free reactive-power control strategy in VSC-HVDC multi-terminal systems to improve transient stability
Renedo Anglada, Javier; Rouco Rodríguez, Luis; García Cerrada, Aurelio; Sigrist, LukasThis paper proposes a new reactive-power control strategy for High Voltage Direct Current multi-terminal systems with Voltage Source Converter stations (VSC-HVDC) to improve transient stability in electric power transmission ... -
A communication-free reactive-power control strategy in VSC-HVDC multi-terminal systems to improve transient stability
Renedo Anglada, Javier; Rouco Rodríguez, Luis; García Cerrada, Aurelio; Sigrist, Lukas (2019-09-01)This paper proposes a new reactive-power control strategy for High Voltage Direct Current multi-terminal systems with Voltage Source Converter stations (VSC-HVDC) to improve transient stability in electric power transmission ... -
A framework for sizing of grid-forming batteries for primary frequency support in small isolated power systems with high penetration of PV
Jiménez Serrano, Clara; Sigrist, Lukas; Egido Cortés, Ignacio; Renedo Anglada, Javier; Laloux Dallemagne, DamienThis paper proposes a framework to size battery energy storage systems (BESS) for primary frequency support in isolated power systems with high penetration of renewable energy sources (RES). The proposed method consists ... -
A method for the design of UFLS schemes of small isolated power systems
Sigrist, Lukas; Egido Cortés, Ignacio; Rouco Rodríguez, Luis (2012-05-01)This paper presents a systematic method for the design of robust and efficient underfrequency load-shedding (UFLS) schemes. UFLS schemes play an important role in protecting the system integrity. The systematic method ... -
A review of the state of the art of UFLS schemes for isolated power systems
Sigrist, Lukas; Rouco Rodríguez, Luis; Echavarren Cerezo, Francisco (2018-07-01)This paper presents a review of the state of the art of UFLS schemes for isolated power systems. Isolated power systems are especially sensitive to power imbalances and underfrequency load-shedding (UFLS) schemes are crucial ... -
A simple rule-based energy management system for off-grid systems
Sigrist, Lukas; Rouco Rodríguez, Luis; Saboya Bautista, Inmaculada; Díez Maroto, LuisOff-grid systems are systems that are not interconnected with the grid and that congruently operate in islanded mode permanently. In order to operate the off-grid system efficiently, an energy management system (EMS) is ... -
A tool for optimal operation and design of batteries and its applications to self-consumption
Fernández de Bobadilla, Jose María; Lobato Miguélez, Enrique; Sigrist, Lukas; González García, AlezeiaThis paper presents a tool for optimal operation and design of batteries and its applications to self-consumption. The recent improvements in capabilities and costs of battery storage technologies might enable new business ... -
A tool for simulation, analysis and design of underfrequency load-shedding (UFLS) schemes of isolated power systems
Sigrist, Lukas; Egido Cortés, Ignacio; Rouco Rodríguez, Luis; Rodríguez Velázquez, Alfredo; Castro, Cristobal; Rupérez, Jesús; Marín Fernández, SantiagoIsolated power systems are especially sensitive to generation-load imbalances. The small size, the relatively low inertia, and the comparatively large generation in-feeds make them more vulnerable to frequency instability ... -
A tool for simulation, analysis and design of underfrequency load-shedding (UFLS) schemes of isolated power systems
Sigrist, Lukas; Egido Cortés, Ignacio; Rouco Rodríguez, Luis; Rodríguez Velázquez, Alfredo; Castro, Cristobal; Rupérez, Jesús; Marín Fernández, SantiagoIsolated power systems are especially sensitive to generation-load imbalances. The small size, the relatively low inertia, and the comparatively large generation in-feeds make them more vulnerable to frequency instability ... -
A UFLS scheme for small isolated power systems using rate-of-change of frequency
Sigrist, Lukas (2015-07-01)This letter presents a centralized underfrequency load-shedding (UFLS) scheme using the initial rate-of-change of frequency (ROCOF) to decide whether and how much load needs to be shed. The applicability of the centralized ... -
A vector-based flexible-complexity power system tool for simulation, and static and modal analysis
Tomás Martín, Andrés; García Aguilar, Javier; García Cerrada, Aurelio; Sigrist, Lukas; Suárez Porras, JorgeMATLAB-Simulink-based tools for analysing electric power systems have been proposed widely before. However, to the best of the authors' knowledge, there is a need for a tool that does not require extensive modifications ... -
Addressing unfeasibilities of energy storage systems participating in energy and reserve markets
Nemati, Hadi; Sigrist, Lukas; Rouco Rodríguez, Luis; Sánchez Martín, Pedro; Ortega Manjavacas, ÁlvaroOptimization algorithms formulated to define the joint participation of Energy Storage Systems (ESSs) in energy and reserve markets often lead to unfeasibilities related to the available energy stored in the ESS, particularly ... -
Addressing unfeasibilities of energy storage systems participating in energy and reserve markets
Nemati, Hadi; Sigrist, Lukas; Rouco Rodríguez, Luis; Sánchez Martín, Pedro; Ortega Manjavacas, Álvaro (Institute of Electrical and Electronics Engineers Power and Energy Society; Universidad de Novi Sad (Novi Sad, Serbia), 2022-11-28)Optimization algorithms formulated to define the joint participation of Energy Storage Systems (ESSs) in energy and reserve markets often lead to unfeasibilities related to the available energy stored in the ESS, particularly ... -
An induction motor model for system frequency response models
Sigrist, Lukas; Rouco Rodríguez, LuisThis paper presents a simple induction motor (IM) model for system frequency response (SFR) simulations. SFR simulations are widely used to analyze frequency stability of small isolated power systems. Isolated power systems ... -
An induction motor model for system frequency response models
Sigrist, Lukas; Rouco Rodríguez, Luis (2017-11-01)This paper presents a simple induction motor (IM) model for system frequency response (SFR) simulations. SFR simulations are widely used to analyze frequency stability of small isolated power systems. Isolated power systems ... -
An ultra-capacitor for frequency stability enhancement in small-isolated power systems: models, simulation and field tests
Egido Cortés, Ignacio; Sigrist, Lukas; Lobato Miguélez, Enrique; Rouco Rodríguez, Luis; Barrado Sánchez, Alberto Carlos (2015-01-01)The most relevant issue in operation of isolated power systems is frequency stability. Frequency stability is concerned with the ability of generators to supply the loads at an acceptable frequency after a disturbance. ... -
Analysis of the effect of control bandwidth on inverter interactions using small-signal stability analysis
de la Barba Suárez, Luis Ismael; Sigrist, Lukas; Rouco Rodríguez, Luis; Avila Martinez, Regulo Enrique; García Cerrada, AurelioThe penetration of power inverter connected renewable energy sources in the grid and in particular in distribution grids is growing day by day. This paper investigates, the stability of converters interacting in electrical ... -
Analysis of the effect of control bandwidth on inverter interactions using small-signal stability analysis
de la Barba Suárez, Luis Ismael; Sigrist, Lukas; Rouco Rodríguez, Luis; Avila Martinez, Regulo Enrique; García Cerrada, Aurelio (Universidad de Castilla-La Mancha (Ciudad Real, España), 2021-07-07)The penetration of power inverter connected renewable energy sources in the grid and in particular in distribution grids is growing day by day. This paper investigates, the stability of converters interacting in electrical ... -
Analytical frequency-constrained UC for island power systems
Rouco Ferriz, Almudena; Rajabdorri, Mohammad; Lobato Miguélez, Enrique; Sigrist, LukasThis paper presents a frequency-constrained unit commitment (FCUC) formulation for island power systems. The timely activation of spinning reserve is key to guaranteeing frequency stability in the operation planning phase. ...