IKERLAN is an applied research centre that belongs to the Basque network of research centres. It also belongs to the IK4 group.The centre was founded in 1974 by a group of lecturers from Mondragon University to provide R&D services to the Mondragon Corporation.The main activities of the centre are in 3 business units product development, processes, and energy. Wikipedia.
Rodriguez P.,University of Barcelona |
Luna A.,University of Barcelona |
Munoz-Aguilar R.S.,University of Barcelona |
Etxeberria-Otadui I.,IKERLAN - IK4 |
And 2 more authors.
IEEE Transactions on Power Electronics | Year: 2012
Grid synchronization algorithms are of great importance in the control of grid-connected power converters, as fast and accurate detection of the grid voltage parameters is crucial in order to implement stable control strategies under generic grid conditions. This paper presents a new grid synchronization method for three-phase three-wire networks, namely dual second-order generalized integrator (SOGI) frequency-locked loop. The method is based on two adaptive filters, implemented by using a SOGI on the stationary reference frame, and it is able to perform an excellent estimation of the instantaneous symmetrical components of the grid voltage under unbalanced and distorted grid conditions. This paper analyzes the performance of the proposed synchronization method including different design issues. Moreover, the behavior of the method for synchronizing with highly unbalanced grid is proven by means of simulation and experimental results, demonstrating its excellent performance. © 2011 IEEE. Source
Ikerlan - Ik4 | Date: 2010-10-07
A solid oxide fuel stack. In one implementation a solid oxide fuel cell is supported by and electrically coupled to a connector with the solid oxide fuel cell having a first electrode, an electrolyte deposited on the first electrode, a second electrode deposited on the electrolyte, and a metal support arranged on the second electrode. In one implementation the connector has a first member in contact with a portion of the metal support and is arranged to resiliently support the first solid oxide fuel cell by the application of contact pressure to the portion of the metal support.
Beltran H.,Jaume I University |
Bilbao E.,IKERLAN - IK4 |
Bilbao E.,Ecole Polytechnique Federale de Lausanne |
Belenguer E.,Jaume I University |
And 2 more authors.
IEEE Transactions on Industrial Electronics | Year: 2013
This paper analyzes the minimum energy capacity ratings that an energy-storage (ES) system should accomplish in order to achieve a defined constant power production in a photovoltaic (PV) power plant. ES is a key issue for the further integration of intermittent and stochastic renewable energy sources, which are not currently dispatchable due to their dependence on real-time weather conditions, as is the case of PV technology. This paper proposes and describes an energy management strategy (EMS) for operating PV power plants with ES in the future. The goal of this EMS is to endow these power plants with a constant production that can be controlled and hence traded on electricity markets. This paper presents simulated results on the percentage of time throughout the year during which a large-scale PV$+$ES plant operates properly with different ES ratings and according to different configurations of this EMS. Finally, a test bench was developed, and experimental results validating this EMS were obtained. © 2012 IEEE. Source
Fernandez-Akarregi A.R.,IKERLAN - IK4 |
Makibar J.,IKERLAN - IK4 |
Lopez G.,University of the Basque Country |
Amutio M.,University of the Basque Country |
Olazar M.,University of the Basque Country
Fuel Processing Technology | Year: 2013
An original pyrolysis pilot plant provided with a conical spouted bed reactor has been designed and built for treating 25 kg/h of biomass. The scale-up of the process has been based on the previous knowledge acquired in both hydrodynamics and pyrolysis studies carried out at laboratory scale, as well as on the research conducted on 1:1 scale reactor made of methacrylate and operating at ambient conditions. The main components of the pyrolysis pilot plant are described and their performance is tested and assessed. Furthermore, preliminary results obtained by pyrolysing pinewood sawdust are presented. The pyrolysis plant operates in continuous mode for long periods without major operation problems. The excellent features of the spouted bed reactor (high heat transfer rates, short residence times, continuous char removal, etc.) allow obtaining high bio-oil yields. Thus, the maximum bio-oil yield is obtained at 480 C, reaching a value of 65.8%, with the yields of gas and char being 18.8% and 15.4%, respectively. The bio-oil obtained has suitable features for its subsequent valorization. © 2013 Elsevier B.V. Source
Herrasti Z.,IKERLAN - IK4 |
Martinez F.,IKERLAN - IK4 |
Baldrich E.,Autonomous University of Barcelona
Sensors and Actuators, B: Chemical | Year: 2014
Magnetic particles (MP) and carbon nanotubes (CNT) have been extensively exploited in biosensor development. It has been recently suggested that combining MP binding of electroactive molecules with CNT wiring of the MP surface could provide novel sensing formats. Here, we demonstrate the validity of this approach using as a model dopamine (DA). As we show, DA can be electrostatically bound and concentrated using commercially available streptavidin-coated MP. Electrochemical detection of MP-bound DA is then accomplished by CNT wiring using cheap and disposable screen printed electrodes of different sizes and materials. The parameters potentially affecting DA binding, CNT wiring and electrochemical detection have been studied and optimized. The resulting assay takes 45 min, displays LOD of 2 nM DA in saline solution, is unaffected by ascorbic acid and uric acid, and can be operated in diluted urine human samples. Our results confirm that CNT wiring allows efficient detection of electroactive species after MP binding and is compatible with the study of complex real samples. © 2014 Elsevier B.V. Source