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  • Stability analysis of systems with high VSC penetration: where is the limit? 

    Collados Rodríguez, Carlos; Cheah Mañé, Marc; Prieto Araujo, Eduardo; Gomis Bellmunt, Oriol (Institute of Electrical and Electronics Engineers (IEEE), 2019-12-16)
    Article
    Restricted access - publisher's policy
    The paper addresses the stability of modern voltage-source-converter-dominated power systems, which are experiencing a progressive phase-out of conventional generation. An essential system model is used to capture the ...

  • International tendencies on energy security: a review on national energy policies in the electrical sector 

    Fuentes Ruiz, Sergio; Villafafila Robles, Roberto; Olivella Rosell, Pol (2019-05-03)
    Article
    Open Access
    Energy security constitutes a priority within national energy policies. The international trend of energy transitions has fostered electrification of the energy systems, so it results imperative to study how the concept ...

  • Run to failure: aging of commercial battery cells beyond their end of life 

    Andreas, Ziegler; Oeser, David; Hein, Thiemo; Montesinos Miracle, Daniel; Ackva, Ansgar (2020-04-11)
    Article
    Open Access
    The aim of this work is to age commercial battery cells far beyond their expected lifetime. There is a gap in the literature regarding run to failure tests of lithium-ion batteries that this work intends to address. ...

  • Voltage sag influence on controlled threephase grid-connected inverters according to the Spanish grid code 

    Bakkar, Mostafa; Bogarra Rodríguez, Santiago; Rolán Blanco, Alejandro; Córcoles López, Felipe; Saura Perisé, Jaime (2020-02-03)
    Article
    Open Access
    To ensure the safe operation of the grid, there are some requirements to be taken into consideration to connect power converters. During abnormal conditions – e.g. during voltage sags –, the control of the converters is a ...

  • Aircraft Charging and its Influence on Triggered Lightning 

    Pavan, C.; Fontanes Molina, Pol; Urbani, Michele; Nguyen, Ngoc-Cuong; Martínez Sánchez, Manuel; Peraire Guitart, Jaume; Guerra García, Carmen (2020-01-16)
    Article
    Open Access
    This paper reports on a laboratory experiment to study the effect of vehicle net charge on theinception of a positive leader from an aircraft exposed to high atmospheric electric fields. The experimentmodels the first stage ...

  • Robust decentralized approach to interaction mitigation in VSC-HVDC grids through impedance minimization 

    Agbemuko, Adedotun Jeremiah; Domínguez Garcia, José Luis; Gomis Bellmunt, Oriol (2020-01-01)
    Article
    Restricted access - publisher's policy
    An interconnection of independently designed voltage source converters (VSCs) and their control in high voltage DC grids can result in network-level detrimental interactions and even instability. In many cases, vendors are ...

  • Analysis of the lightning production of convective cells 

    Figueras i Ventura, Jordi; Pineda Rüegg, Nicolau; Besic, Nikola; Grazioli, Jacopo; Hering, Alessandro; Van der Velde, Oscar Arnoud; Romero Durán, David; Sunjerga, A.; Mostajabi, A.; Azadifar, M.; Rubinstein, M.; Montanya, Joan; Germann, Urs; Rachidi-Haeri, Farhad (2019-10-22)
    Article
    Open Access
    This paper presents an analysis of the lightning production of convective cells. The cells were detected by the MeteoSwiss Thunderstorms Radar Tracking (TRT) algorithm in the course of a lightning measurement campaign that ...

  • A power calculation algorithm for single-phase droop-operated-inverters considering linear and nonlinear loads HIL-assessed 

    El Mariachet Carreño, Jorge; Matas Alcalá, José; Martín Cañadas, María Elena; Li, Mingshen; Guan, Yajuan; Guerrero, Josep M. (2019-11-01)
    Article
    Open Access
    The active and reactive powers, P and Q, are crucial variables in the parallel operation of single-phase inverters using the droop method, introducing proportional droops in the inverter output frequency and voltage amplitude ...

  • Meteorological aspects of self-initiated upward lightning at the Säntis Tower (Switzerland) 

    Pineda, Nicolau; Figueras i Ventura, Jordi; Romero Durán, David; Mostajabi, A.; Azadifar, M.; Sunjerga, A.; Rachidi-Haeri, Farhad; Rubinstein, M.; Montanya, Joan; Van der Velde, Oscar Arnoud; Altube Vázquez, Patricia; Besic, Nikola; Grazioli, Jacopo; Germann, Urs; Williams, Earle R. (2019-12-26)
    Article
    Open Access
    Interest in exploring the meteorological conditions favoring upward lightning from tall man-made structures has grown in recent years, largely due to the worldwide expansion of wind energy. To this end, instrumented towers ...

  • Assessment of unintentional islanding operations in distribution networks with large induction motors 

    Casals Torrens, Pau; Martinez Velasco, Juan A.; Serrano Fontova, Alexandre; Bosch Tous, Ricardo (2020-01-10)
    Article
    Open Access
    This paper is aimed at assessing the impact of unintentional islanding operations (IOs) in the presence of large induction motors (IMs) within distribution networks (DNs). When a fault occurs,followingthecircuitbreaker(C ...

  • Detection of inter-turn faults in multi-phase ferrite-PM assisted synchronous reluctance machine 

    Candelo Zuluaga, Carlos Andres; Riba Ruiz, Jordi-Roger; López Torres, Carlos; García Espinosa, Antonio (Multidisciplinary Digital Publishing Institute (MDPI), 2019-07-17)
    Article
    Open Access
    Inter-turn winding faults in five-phase ferrite-permanent magnet-assisted synchronous reluctance motors (fPMa-SynRMs) can lead to catastrophic consequences if not detected in a timely manner, since they can quickly progress ...

  • A novel voltage sag approach during unintentional islanding scenarios: A survey from real recorded events 

    Serrano Fontova, Alexandre; Casals Torrens, Pau; Bosch Tous, Ricardo (2019-07)
    Article
    Open Access
    In this paper, a new voltage sag approach is analytically modelled and validated using both simulation and field measurements. The main aspect of this approach is to propose a new voltage sag feature which appears during ...

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