Browsing by Author "De Muro, Asier Gil"
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Item Architecture of a microgrid energy management system(2011-03) Jimeno, Joseba; Anduaga, Jon; Oyarzabal, José; De Muro, Asier Gil; POWER SYSTEMS; POWER ELECTRONICS AND SYSTEM EQUIPMENTIn the framework of deregulated electricity markets, distributed generation and load management are emerging as new technologies. In this context, the microgrid concept adds value to distributed energy resources (DER) by aggregating them into autonomous grids that provide high levels of efficiency, security and controllability. In order to achieve its functions, a microgrid requires a control system in charge of operating the elements in it in an optimal way while the required quality parameters are fulfilled. This paper describes the general architecture of a microgrid energy management system (EMS) based on multi-agent system (MAS) technologies. MAS technologies are considered to be very well suited to systems that require plug and play capabilities, robustness, heterogeneous device integration, high scalability and extensibility. All of which are essential characteristics of a microgrid EMS. This paper also describes the implementation of a secondary control system based on the microgrid EMS architecture developed. This system is in charge of maintaining microgrid frequency and power exchange with the main grid close to predefined values. This is achieved in a way in which generation and consumption resources are optimally dispatched and able to operate in both grid connected and islanded modes. Finally, the control system developed is tested in an actual microgrid in order to assess its performance and demonstrate its applicability.Item Experiences and conclusions towards a harmonized process for the certification of equipment connected to the electricity network: Islanding prevention(2007) De Muro, Asier Gil; Perea, Eugenio; Zabala, Eduardo; POWER ELECTRONICS AND SYSTEM EQUIPMENT; DIGITAL ENERGY; Tecnalia Research & InnovationManufacturers of equipment to be connected to the electricity network, in the new liberalized market, have to evidence compliance with the new requirements that are expected to be asked. In the same way, certification laboratories have to undertake a great investment to purchase new measurement equipment and train personnel to continue to fulfil their aim as accredited certification bodies in the electricity sector and, more concretely, in the Distributed Energy Resources interconnection, Power Quality and EMC domains. This paper describes some conclusions based on the experiences of LABEIN-Tecnalia, as a well known accredited certification entity, with the objective to illustrate the efforts carried out, mainly in the field of islanding prevention. The paper starts from a description of the accreditation and compliance processes, it features a new laboratory specification, and then analyzes the first experimental tests and results to show the capabilities of the laboratory, in order to verify that a system connected to the electricity grid is compliant with the islanding requirements.Item SiC modular multilevel converters: Sub-module voltage ripple analysis and efficiency estimations(Mesago PCIM GmbH, 2014) Perez-Basante, Angel; Ceballos, Salvador; Pou, Josep; De Muro, Asier Gil; Pujana, Ainhoa; Ibáñez, Pedro; POWER ELECTRONICS AND SYSTEM EQUIPMENT; DIGITAL ENERGY; SGTwo important technical challenges associated with the Modular Multilevel Converter (MMC) are the reduction of the voltage ripple of the Sub-Module (SM) capacitors and the reduction of the converter losses. This paper conducts a study focused on these two topics. Firstly, the effect of a circulating current with a predefined second harmonic on the SM voltage ripple is assessed. Secondly, an efficiency study for two different MMCs, one with silicon (Si) and the other with silicon carbide (SiC) devices is carried out. Results suggest that a SiC MMC converter with a circulating current including a second harmonic represent a good solution since it achieves a reduction of the SM capacitors together with a high efficiency operation.Item Transportable hydrogen research plant based on renewable energy(2006) Fernández, Mikel; Madina, Carlos; De Muro, Asier Gil; Alzola, José Ángel; Marino, Iker; García-Tejedor, Javier; Carlos Múgica, Juan; Azkárate, Iñaki; DIGITAL ENERGY; POWER SYSTEMS; POWER ELECTRONICS AND SYSTEM EQUIPMENT; Tecnalia Research & Innovation; SGEfficiency and cost are nowadays the most important barriers for the penetration of systems based on hydrogen and renewable energies. According to this background, TECNALIA Corporation has started in 2004 the HIDROTEC project: "Hydrogen Technologies for Renewable Energy Applications". The ultimate aim of this project is the implementation of a multipurpose demonstration and research plant in order to explore diverse options for sustainable energetic solutions based on hydrogen. The plant is conceived as an independent system that can be easily transported and assembled. Research and demonstration activities can thus be carried out at very different locations, including commercial renewable facilities. Modularity and scalability have also been taken into account for an optimised exploitation.