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Admittance study of grid-connected VSCs for harmonic oscillatory instabilities
Sainz, Luis; Monjo, Lluís; Cheah-Mane, Marc; Liang, Jun; Gomis-Bellmunt, Oriol; Prieto Araujo, Eduardo IET (2019-07)Voltage source converters (VSCs) can reduce damping of grid-connected VSC systems at harmonic resonances, leading to system instability. The conductance of the VSC admittance can be shaped selecting appropriate VSC parameter ... -
Aeronautical ground lighting system study: field measurements and simulations
Vidal Lombarte, Daniel; Monjo, Lluís; Sainz, Luis Institution of Engineering and Technology (IET) (2016)Aeronautical ground lighting (AGL) systems are single-phase series circuits where constant current regulators supply transformers and luminaires. These systems provide visual reference to aircraft during airport operations. ... -
Assessment of Subsynchronous Oscillations in AC grid-connected VSC Systems with Type-4 Wind Turbines
Sainz, Luis; Monjo, Lluís; Cheah-Mane, Marc; Liang, Jun The Institution of Engineering and Technology (IET) (2019-10-16)Converters are the key for the increasing development of renewable energy generation but their dynamic interaction with the grid has an important impact on stability. Oscillatory instabilities in different grid-connected ... -
Auditoría y certificación energética del colegio público Vicente Artero en Castellón
Lacomba Albert, Celia; Monjo, Lluís Universitat Jaume I (2018-01)El objeto del proyecto es realizar una auditoría energética al CEIP Vicente Artero y proponer medidas correctoras si es necesario. El alcance del proyecto será el estudio de las instalaciones de climatización, iluminación, ... -
Effect of wind turbine converter control on wind power plant harmonic response and resonances
Sainz, Luis; Monjo, Lluís; Pedra Durán, Joaquín; Cheah-Mane, Marc; Liang, Jun; Gomis-Bellmunt, Oriol The Institution of Engineering and Technology (2017-02)Wind turbine harmonic emissions due to power electronics are a well-known power quality concern in wind power plants (WPPs). This problem may be increased by resonances because they amplify harmonic distortion around ... -
Harmonic Resonance Stability of Aeronautical Ground Lighting Systems
Vidal Lombarte, Daniel; Monjo, Lluís; Sainz, Luis IEEE (2018-02)Aeronautical ground lighting (AGL) systems assist aircraft pilots in airport operations. These systems are singlephase series circuits where constant current regulators (CCRs) feed luminaires with an adjustable rms current. ... -
Model of Aeronautical Ground Lighting System Transformers
Vidal Lombarte, Daniel; Monjo, Lluís; Sainz, Luis; Pedra Durán, Joaquín Institution of Engineering and Technology (IET) (2014-09)Aeronautical ground lighting (AGL) systems provide visual reference to aircraft during airport operations. In AGL systems, constant current regulators feed a series circuit composed of luminaires supplied through ... -
Parameter estimation of squirrel-cage motors with parasitic torques in the torque-slip curve
Monjo, Lluís; Córcoles López, Felipe; Pedra Durán, Joaquín Institution of Engineering and Technology (2015)This paper studies parasitic torques in steady-state torque-slip curves of squirrel-cage induction motors. The curves of nine motors (small, medium and large size units), three of which were measured in the range s = 2 ... -
Parameter estimation of wound rotor induction motors from transient measurements
Kojooyan-Jafari, Hengameh; Monjo, Lluís; Córcoles López, Felipe; Pedra Durán, Joaquín IEEE Power & Energy Society (2014-06)A new method for determination of the steadystate equivalent circuit parameters of wound rotor induction motors using experimental starting transient measurements is presented. The algorithm data are the stator currents ... -
Positive-Net-Damping Stability Criterion in Grid-Connected VSC Systems
Sainz, Luis; Cheah-Mane, Marc; Monjo, Lluís; Liang, Jun; Gomis-Bellmunt, Oriol Institute of Electrical and Electronics Engineers (IEEE) (2017-05)Resonance instabilities in power systems can be assessed with the positive-net-damping stability criterion. This criterion is a review of the complex torque coefficients method but it does not provide the frequency of the ... -
Quasi-Z-Source Inverter-Based Photovoltaic Power System Modeling for Grid Stability Studies
Monjo, Lluís; Sainz, Luis; Mesas, Juan José; Pedra, Joaquin MDPI (2021-01-19)Quasi-Z-source inverters (qZSIs) are becoming a powerful power conversion technology in photovoltaic (PV) power systems because they allow energy power conversion in a single stage operation. However, they can cause ... -
Reduced-Order Models of Squirrel-Cage Induction Generators for Fixed-Speed Wind Turbines under Unbalanced Grid Conditions
Rolán Blanco, Alejandro; Córcoles López, Felipe; Bogarra, Santiago; Monjo, Lluís; Pedra Durán, Joaquín Institute of Electrical and Electronics Engineers (IEEE) (2016-06)This paper develops a study of reduced-order models for squirrel-cage induction generators (SCIG) used in fixed-speed wind turbines (WTs). The squirrel-cage of these generators must be modeled with a double-cage for ... -
Resonance-Based Procedure for Locating Failed Luminaires in AGL Systems
Vidal Lombarte, Daniel; Monjo, Lluís; Sainz, Luis Institute of Electrical and Electronics Engineers (IEEE) (2017-08)Aeronautical ground lighting (AGL) systems provide a visual reference for aircraft during airport operations. Fast detection and location of failed luminaires is an important safety concern in AGL systems. In the event of ... -
State-Space Model of Quasi-Z-Source Inverter-PV Systems for Transient Dynamics Studies and Network Stability Assessment
Monjo, Lluís; Sainz, Luis; Mesas, Juan José; Pedra, Joaquin MDPI (2021-07-09)Photovoltaic (PV) power systems are increasingly being used as renewable power generation sources. Quasi-Z-source inverters (qZSI) are a recent, high-potential technology that can be used to integrate PV power systems into ... -
Study of resonance in wind parks
Monjo, Lluís; Sainz, Luis; Liang, Jun; Pedra Durán, Joaquín Elsevier (2015)Wind turbine harmonic current emissions are a well-known power quality problem. These emissions flow through wind park impedances, leading to grid voltage distortion. Parallel resonance may worsen the problem because it ... -
Study of Resonances in 1X25 kV AC Traction Systems With External Balancing Equipment
Mesbahi, Nadhir; Monjo, Lluís; Sainz, Luis IEEE (2016-10)AC traction systems are 1 × 25 or 2 × 25 kV/50 Hz single-phase, nonlinear, time-varying loads that can cause power-quality problems, such as unbalanced or distorted voltages. To reduce unbalance, external balancing equipment ... -
Study of resonances in 1x25kV AC traction systems
Monjo, Lluís; Sainz, Luis (2015)Abstract: AC traction systems are 1x25 or 2x25 kV 50 Hz single-phase, non-linear, time-varying loads that can cause power quality problems. One of the main concerns about these systems is voltage distortion because ... -
Testing of three-phase equipment under voltage sags
Rolán Blanco, Alejandro; Córcoles López, Felipe; Pedra Durán, Joaquín; Monjo, Lluís; Bogarra, Santiago Institution of Engineering and Technology (IET) (2015-04)This paper provides insight into the testing of three-phase equipment exposed to voltage sags caused by faults. The voltage sag recovers at the fault-current zeros, leading to a `discrete' voltage recovery, that is, the ... -
Three-Port Small Signal Admittance-Based Model of VSCs for Studies of Multi-terminal HVDC Hybrid AC/DC Transmission Grids
Pedra, Joaquin; Sainz, Luis; Monjo, Lluís IEEE (2020-06-19)Multi-terminal high voltage direct current (HVDC) systems, together with AC transmission systems and voltage source converters (VSCs), form hybrid AC/DC grids with complex dynamic and transient interactions. VSCs ... -
Using the instantaneous power of a free acceleration test for squirrel-cage motor parameters estimation
Kojooyan-Jafari, Hengameh; Monjo, Lluís; Córcoles López, Felipe; Pedra Durán, Joaquín IEEE Power & Energy Society (2015-09)A new parameters determination method for squirrel-cage induction motors is presented. As a main contribution, the method uses the instantaneous electrical power and the mechanical speed measured in a free acceleration ...