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Now showing items 1-15 of 15

    • A robust THD based communication-less protection method for electrical grids with DGs 

      Al Hanaineh, Wael Hasan Ahmad; Matas Alcalá, José; Bakkar, Mostafa; El Mariachet Carreño, Jorge; Guerrero, Josep Manuel Ramos (Elsevier, 2024-01-01)
      Article
      Open Access
      In this paper, a protection method with two cascaded algorithms is proposed to face fault events in Electrical Distribution Systems (EDSs). The first algorithm uses the Total Harmonic Distortion (THD), the estimates of the ...

    • A secure dual-layer fault protection strategy for distribution network with DERs: enhancing security in the face of communication challenges 

      Al Hanaineh, Wael Hasan Ahmad; Matas Alcalá, José; Guerrero Zapata, Josep Maria; Bakkar, Mostafa (Multidisciplinary Digital Publishing Institute (MDPI), 2024-02-01)
      Article
      Open Access
      Earlier protection methods mainly focused on using communication channels to transmit trip signals between the protective devices (PDs), with no solutions provided in the case of communication failure. Therefore, this paper ...

    • A THD-based fault protection method using MSOGI-FLL grid voltage estimator 

      Al Hanaineh, Wael Hasan Ahmad; Matas Alcalá, José; El Mariachet Carreño, Jorge; Xie, Peilin; Bakkar, Mostafa; Guerrero, Josep M. (Multidisciplinary Digital Publishing Institute (MDPI), 2023-01-14)
      Article
      Open Access
      The rapid growth of the distributed generators (DGs) integration into the distribution systems (DSs) creates new technical issues; conventional relay settings need to be updated depending on the network topology and ...

    • Artificial intelligence-based protection for smart grids 

      Bakkar, Mostafa; Bogarra Rodríguez, Santiago; Córcoles López, Felipe; Aboelhassan, Ahmed; Wang, Shuo; Iglesias, Javier (2022-07-05)
      Article
      Open Access
      Lately, adequate protection strategies need to be developed when Microgrids (MGs) are connected to smart grids to prevent undesirable tripping. Conventional relay settings need to be adapted to changes in Distributed ...

    • Integration of Distributed Energy Resources to Unbalanced Grids under Voltage Sags with Grid Code Compliance 

      Rolán Blanco, Alejandro; Bogarra Rodríguez, Santiago; Bakkar, Mostafa (2022-01-01)
      Article
      Open Access
      The aim of this paper is to analyze the situations in which distributed power generation systems (DPGSs) based on renewable energy sources (RESs) can be controlled when operating under voltage sags. Analytical models for ...

    • Multi-layer smart fault protection for secure smart grids 

      Bakkar, Mostafa; Bogarra Rodríguez, Santiago; Córcoles López, Felipe; Al Hanaineh, Wael Hasan Ahmad (Institute of Electrical and Electronics Engineers (IEEE), 2023-07)
      Article
      Open Access
      The trend toward Smart grid (SG) is increasing significantly by incorporating Distributed Generators (DGs), which leads to new challenges, especially in protection systems. SGs should strengthen robust environments against ...

    • New methodology to calculate DC voltage signature in n-phases TRUs under supply voltage sags 

      Saura Perisé, Jaime; Bakkar, Mostafa; Bogarra Rodríguez, Santiago (Institute of Electrical and Electronics Engineers (IEEE), 2022-02-28)
      Article
      Open Access
      A new methodology based on the shadow projection has been developed to study any multipulse rectifier's dynamic behavior under balanced and unbalanced conditions. The proposed methodology calculates the DC average voltage ...

    • Open-circuit fault diagnosis and maintenance in multi-pulse parallel and series TRU topologies 

      Saura Perisé, Jaime; Bakkar, Mostafa; Bogarra Rodríguez, Santiago (Institute of Electrical and Electronics Engineers (IEEE), 2020-02-27)
      Article
      Open Access
      Transformer Rectifier Units (TRUs) are a reliable way for DC generation in several electric applications. These units are formed by multiple three-phase uncontrolled bridge rectifiers connected according to two main ...

    • Overcurrent protection based on ANNs for smart distribution networks with grid-connected VSIs 

      Bakkar, Mostafa; Bogarra Rodríguez, Santiago; Córcoles López, Felipe; Iglesias, Javier (2020-12-16)
      Article
      Open Access
      Recently, the global concern for protection coordination is growing with the impact of distributed generators connected to medium voltage distribution system. Effective protection strategies need to be developed in order ...

    • Power control strategies during voltage sags according to Spanish grid code 

      Bogarra Rodríguez, Santiago; Córcoles López, Felipe; Saura Perisé, Jaime; Moreno Eguilaz, Juan Manuel; Bakkar, Mostafa (2018)
      Conference report
      Open Access
      In order to connect any power converters into the grid there are some grid requirements to insure the safe operation of the grid. So, the control of the converters especially during abnormal ...

    • PV systems control using fuzzy logic controller employing dynamic safety margin under normal and partial shading conditions 

      Bakkar, Mostafa; Aboelhassan, Ahmed; Abdelgeliel, Mostafa; Galea, Michael (2021-02-05)
      Article
      Open Access
      Because of the unpredictable activity of solar energy sources, photovoltaic (PV) maximum power point tracking (MPPT) is essential to guarantee the continuous operation of electrical energy generation at optimal power levels. ...

    • Sag effects on protection system in distributed generation grids 

      Bakkar, Mostafa (Universitat Politècnica de Catalunya, 2022-02-07)
      Doctoral thesis
      Open Access
      Distributed Generators (DGs) are sensible to voltage sags, so the protection devices must trip fast to disconnect the faulted part of the grid. The DG disconnection will not be desirable in the near future with a large ...

    • Three-level secure smart protection for ring grid-connected distributed generation 

      Bakkar, Mostafa; Bogarra Rodríguez, Santiago; Córcoles López, Felipe; Aboelhassan, Ahmed; Wang, Shuo; Iglesias, Javier (2024-06-28)
      Article
      Open Access
      The penetration increase in distributed generators (DGs) into smart grids (SGs) will lead to new challenges, especially in protection systems. In the case of ring grids, the behavior of the short-circuit current is affected ...

    • Voltage recovery influence on three-phase grid-connected inverters under voltage sags 

      Rolán Blanco, Alejandro; Giménez, Pablo; Yague, Sauro J.; Bogarra Rodríguez, Santiago; Saura Perisé, Jaime; Bakkar, Mostafa (2019-02-12)
      Article
      Open Access
      Faults in power systems cause voltage sags, which, in turn, provoke large current peaks in grid-connected equipment. Then, a complete knowledge of the inverter behaviour is needed to meet fault ride-through capability. The ...

    • Voltage sag influence on controlled three-phase 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 ...