11 research outputs found

    Combined vehicle to building (V2B) and vehicle to home (V2H) strategy to increase electric vehicle market share

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    .Buildings are one of the most important energy consumers in modern economy countries. The massive use of electrical vehicles could help decarbonizing the economy by using electricity produced using renewable energy. Combined use of Vehicle to Grid (V2G), Vehicle to Home (V2H) and Vehicle to Building (V2B) is one of the strategies to increase the number of electrical vehicles, ensure a better coupling between energy generation and consumption, reducing peak demand and increasing global energy efficiency. This research presents a novel approach of combined use of V2H and V2B that can be applied in different scenarios such as when the building workers own EVs, company shared car fleets or leasing, among others. Recharged energy at workers homes during night hours is delivered in the building during daily working hours lowering peak demand, reducing carbon intensity and energy cost savings. The results show that the methodology is feasible and can be extended to other cases and greatly contribute to better energy efficiency, reduces peak demand in buildings and increase electric vehicles penetration in transport to workplaces.S

    Future work on harmonics : some expert opinions part I : wind and solar power

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    A workshop on power system harmonics was organized in Stockholm in January 2014. On the agenda was among others a discussion on what are the main issues on harmonics at the moment and in the near future. The results of this discussion are summarized in this paper and some of the issues are discussed in more detail in this paper and in its companion paper. This paper discusses emission from wind and solar power as well as advantages and disadvantages of active and passive filters

    Estimación de la corriente de referencia de un filtro activo de potencia usando el filtro de kalman

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    This paper shows a new methodology to calculate the current reference in a shunt active power filter. The methodology is based on the Kalman filter as an electrical parameters estimator and is focused in the compensation of the harmonics generated by nonlinear loads. The validity of the methodology is demonstrated through simulations in Matlab / Simulink and is evaluated in an experimental setup. En este artículo se presenta una nueva metodología que permite calcular en tiempo real la corriente de referencia de un filtro activo de potencia. La metodología está basada en el uso del filtro de Kalman como estimador de parámetros eléctricos y está enfocada para compensar los armónicos generados por cargas no lineales. La validez de la metodología es inicialmente demostrada mediante simulaciones en Matlab/Simulink y finalmente es comprobada al implementarla en un prototipo experimental de un filtro activo de potencia. 

    A unified adaptive scheme for fault location and relay coordination in Smart Grids

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    This paper presents an adaptive protection scheme for distribution networks with distributed generation. The proposed system offers the novelty of being able to both locate the zone in which the fault has occurred and adapt the setting parameters of the relays involved in the process for each network condition. The unified adaptive system can be applied for fault detection in both the main feeder and lateral branches, taking into account the variable conditions of the distributed power generation and power demand. The setting of the relays' parameters responsible for the coordination of the zone protection is done by optimizing three degrees of freedom using mixed-integer nonlinear optimization techniques. The proposed adaptive protection scheme is validated in a standard distribution test feeder to prove its capability to locate faults in both main and lateral branches and optimize the performance of the involved relays under variable generation conditions, different fault types and different fault locations. The adaptive protection scheme reduces relay operating time significantly compared to classical and linear relay techniques

    Hierarchical and distributed control concept for distribution network congestion management

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    Congestion management is one of the core enablers of smart distribution systems where distributed energy resources are utilised in network control to enable cost-effective network interconnection of distributed generation (DG) and better utilisation of network assets. The primary aim of congestion management is to prevent voltage violations and network overloading. Congestion management algorithms can also be used to optimise the network state. This study proposes a hierarchical and distributed congestion management concept for future distribution networks having large-scale DG and other controllable resources in MV and LV networks. The control concept aims at operating the network at minimum costs while retaining an acceptable network state. The hierarchy consists of three levels: primary controllers operate based on local measurements, secondary control optimises the set points of the primary controllers in real-time and tertiary control utilises load and production forecasts as its inputs and realises network reconfiguration algorithm and connection to the market. Primary controllers are located at the connection point of the controllable resource, secondary controllers at primary and secondary substations and tertiary control at the control centre. Hence, the control is spatially distributed and operates in different time frames.publishedVersionPeer reviewe

    Future work on harmonics - some expert opinions Part II - supraharmonics, standards and measurements

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    A workshop on power system harmonics was organized in Stockholm in January 2014. On the agenda was among others a discussion on what are the main issues on harmonics at the moment and in the near future. Some of the issues discussed at that workshop are presented in this paper and its companion paper. In this paper the following issues will be addressed: the appearance of emission at higher frequencies (supraharmonics); the need for new and improved standards; measurement issues and data analysis