Now showing items 1-15 of 15

    • Avoiding overvoltage problems in three-phase distributed-generation systems during unbalanced voltage sags 

      Castilla Fernández, Miguel; Camacho Santiago, Antonio; Miret Tomàs, Jaume; Guzmán Solà, Ramon; García de Vicuña Muñoz de la Nava, José Luis (2020-02-01)
      Article
      Open Access
      During voltage sags, distributed generation systems must fulfil specific grid-code requirements for reactive current injection. This ancillary service can produce overvoltage problems in networks operating in unbalanced ...
    • Conditions for existence of equilibrium points of systems with constant power loads 

      Sanchez, Santiago; Ortega, Romeo; Bergna, Gilbert; Molinas, Marta; Griñó Cubero, Robert (2013)
      Conference report
      Restricted access - publisher's policy
      In this paper we investigate the sine qua non condition of existence of equilibria for electrical systems with external sources furnishing constant power to the loads, which is a scenario encountered in modern applications. ...
    • Coordinated reactive power control for static synchronous compensators under unbalanced voltage sags 

      Castilla Fernández, Miguel; Miret Tomàs, Jaume; Camacho Santiago, Antonio; Matas Alcalá, José; Alarcón Gallo, Eduardo; García de Vicuña Muñoz de la Nava, José Luis (2012)
      Conference report
      Restricted access - publisher's policy
      Unbalanced voltage sags strongly deteriorate the performance of power converters and electrical machines connected to the distribution network. In particular, a reduction of the power quality is noticed in these equipments, ...
    • Disseny i implementaci o d'una plataforma experimental per al desenvolupament de simulacions Power Hardware in the Loop 

      Ferer i San José, Ricard (Universitat Politècnica de Catalunya, 2015-04)
      Master thesis (pre-Bologna period)
      Open Access
      En aquest projecte es presenta el disseny, la implementació i la validació d’una plataforma experimental per al desenvolupament de simulacions utilitzant la tècnica PHIL (Power Hardware in the Loop). Una ...
    • Distributed reactive power control methods to avoid voltage rise in grid-connected photovoltaic power generation systems 

      Martí Colom, Pau; Velasco García, Manel; Fuertes Armengol, José Mª; Camacho Santiago, Antonio; Miret Tomàs, Jaume; Castilla Fernández, Miguel (2013)
      Conference report
      Restricted access - publisher's policy
      A high density of grid-connected photovoltaic (PV) power generation systems is expected to occur in urban areas. The connection of distributed generation (DG) may cause serious problems in the distribution system such ...
    • Enhanced DC-Link Capacitor Voltage Balancing Control of DC-AC Multilevel Multileg Converters 

      Busquets Monge, Sergio; Maheshwari, RamKrishan; Nicolás Apruzzese, Joan; Lupón Roses, Emilio; Munk Nielsen, Stig; Bordonau Farrerons, José (Institute of Electrical and Electronics Engineers (IEEE), 2015-05-01)
      Article
      Restricted access - publisher's policy
      This paper presents a capacitor voltage balancing control applicable to any multilevel dc-ac converter formed by a single set of series-connected capacitors implementing the dc link and semiconductor devices, such as the ...
    • Frequency and voltage partitioning in presence of renewable energy resources for power system (example: North Chile power network) 

      Mehrjerdi, H.; Al-Emadi, N. A.; Rakhshani, Elyas; Rodríguez Cortés, Pedro (2016)
      Conference report
      Open Access
      This paper investigates techniques for frequency and voltage partitioning of power network based on the graph-theory. These methods divide the power system into distinguished regions to avoid the spread of disturbances and ...
    • Grid synchronization structure for wind converters under grid fault conditions 

      Garcia, Jose Ignacio; Candela García, José Ignacio; Luna Alloza, Álvaro; Catalan, Pedro (2016)
      Conference report
      Restricted access - publisher's policy
      This paper presents a grid synchronization structure for three-phase electric power systems based on the use of a filtered quadrature signal generator (FQSG) and a phase-locked loop (PLL) structure, named Adaptive Vector ...
    • Hierarchical control of HV-MTDC systems with droop-based primary and OPF-based secondary 

      Gavriluta, Catalin; Candela García, José Ignacio; Luna Alloza, Álvaro; Gomez Exposito, Antonio; Rodríguez Cortés, Pedro (Institute of Electrical and Electronics Engineers (IEEE), 2014-11-12)
      Article
      Restricted access - publisher's policy
      This paper proposes a hierarchical control architecture designed for an arbitrary high voltage multiterminal dc (MTDC) network. In the proposed architecture, the primary control of the MTDC system is decentralized and ...
    • Power Harware in the Loop Laboratory Setup 

      Viyathukattuva Mohamed Ali, Mohamed Mansoor (Universitat Politècnica de Catalunya, 2013-07)
      Master thesis
      Open Access
      Share of distributed generation in grid system is increasing in time. In conventional generation, rotating mass provides inertia to the grid. Distribution generation causes reduction in inertia of grid system and this ...
    • Reactive current injection protocol for low-power rating distributed generation sources under voltage sags 

      Miret Tomàs, Jaume; Camacho Santiago, Antonio; Castilla Fernández, Miguel; García de Vicuña Muñoz de la Nava, José Luis; Hoz Casas, Jordi de la (2015-06-01)
      Article
      Open Access
      Voltage sags are one of the main problems in transmission and distribution networks. This study proposes a voltage support control scheme for grid-connected low-power rating inverters under voltage sags. Voltage support ...
    • Reactive power control for distributed generation power plants to comply with voltage limits during grid faults 

      Camacho Santiago, Antonio; Castilla Fernández, Miguel; Miret Tomàs, Jaume; Guzmán Solà, Ramon; Borrell Sanz, Angel (2014-01-20)
      Article
      Open Access
      Grid faults are one of the most severe problems for network operation. Distributed generation power plants can help to mitigate the adverse effects of these perturbations by injecting reactive power during the sag and the ...
    • Reserch on the voltage unbalance caused by the increase in penetreation of photovoltaic systems in electrical energy distribution feeders 

      Rul·lan Solana, Francesc Eugeni (Universitat Politècnica de Catalunya / Universidade Estadual de Campinas, 2013)
      Bachelor thesis
      Open Access
      Covenantee:   Universidade Estadual de Campinas
      Due to environmental concerns related to climate change, fiscal incentives from governments around the world, and falling prices of proved and ever-improving technology, the use of renewable energy sources has been rising ...
    • Voltage sag mitigation in a PV-based industrial microgrid during grid faults 

      Ghahderijani, Mohammad Moradi; Castilla Fernández, Miguel; García de Vicuña Muñoz de la Nava, José Luis; Camacho Santiago, Antonio; Torres Martínez, Javier (Institute of Electrical and Electronics Engineers (IEEE), 2017)
      Conference report
      Restricted access - publisher's policy
      The growing interests in industrial microgrid and its high power rating, have made it as a good candidate for voltage support purposes. The aim of this paper is to present a reactive current injection control strategy for ...
    • Voltage support control strategies for static synchronous compensators under unbalanced voltage sags 

      Castilla Fernández, Miguel; Miret Tomàs, Jaume; Camacho Santiago, Antonio; Matas Alcalá, José; García de Vicuña Muñoz de la Nava, José Luis (Institute of Electrical and Electronics Engineers (IEEE), 2014)
      Article
      Restricted access - publisher's policy
      Static synchronous compensators have been broadly employed for the provision of electrical ac network services, which include voltage regulation, network balance, and stability improvement. Several studies of such ...