Search results for "Power"
showing 10 items of 5099 documents
Optimization of BESS Capacity Under a Peak Load Shaving Strategy
2018
Battery energy storage systems (BESSs) are becoming increasingly competitive in the global energy landscape, thanks to the strong cost reduction that has taken place in recent years and it is expected to continue in the next future. Among the many benefits BESSs can provide, time shifting can be exploited by electricity consumers to save on the electricity bill, charging the storage during the off-peak hours and discharging when the cost of electricity is high. This paper describes a simple procedure to optimize the BESS capacity under a peak load shaving strategy, in presence of a time-of-use (TOU) electricity rate, able to guarantee, at the same time, the flattest daily power diagram and …
DEMAND Project: A Peak Load Shaving Strategy for End-User Consumers
2018
Battery energy storage systems (BESS) are becoming increasingly widespread in modern power systems, thanks to the important benefits they can provide to the electricity grid. Indeed, BESS can be used in time shifting applications, storing energy during off-peak periods and discharging during peak times (when the cost of electricity is high). When BESS are used for peak shaving purposes, they also contribute to relieve peak demand charges, thus ensuring a saving for the consumers. This paper describes a peak load shaving strategy defined within the DEMAND project. The strategy is able to guarantee the flattest daily power diagram and the maximum benefit for the electricity consumers, reducin…
Nuoren vieraan kielen opettajan pedagogisen ajattelun ja ammatillisen asiantuntijuuden kehittyminen
2009
Opiskeluaikainen epävarmuus ja itseen kohdistuvat voimakkaat odotukset saattavat ennakoida sitä, että opettaja ei vielä ole valmis työelämään. Tämä kävi ilmi FL Tarja Nymanin väitöstutkimuksessa, jonka tavoitteena oli selvittää, mitkä tekijät vaikuttavat vieraan kielen opettajan pedagogisen ajattelun ja ammatillisen asiantuntijuuden kehittymiseen hänen siirtyessään opinnoista työelämään.- Opiskelijat tulevat koulutukseen erilaisine taustoineen, odotuksineen ja valmiuksineen. Koska opettajan ammatillinen kehittyminen työelämässä on ennustettavissa jo koulutuksen aikana, pitäisi opiskelijoiden yksilöllistä kehittymistä tukea, Nyman huomauttaa.Tarpeiden mukainen koulutus tukee jaksamista myös …
Caring in space: the boundaries between public and private spaces in Finnish adult foster care homes
2020
AbstractThe purpose of this article is to explore a hybrid community-based form of care for older people called adult foster care. In the article, the nature of the foster care home as a place of care is explored from the foster carers’ point-of-view. It is based on an interview study of 12 foster carers. In this article, the theoretical frameworks from human geography and work–family research are combined in order to analyse the boundaries between private family-life and public work-life in the particular space of the foster care home. The research questions are: What kinds of public and private spaces exist in adult foster care homes? What kinds of boundaries separate (a) the public and p…
Experimental test of the performances of a photovoltaic modules model
2015
In this paper, a measurement-based modeling technique for PV panels oriented to power electronics design is proposed. The proposed modelling approach aims at an accurate modeling of the whole PV curve and not only around a few remarkable points. The proposed approach is based on an experimental characterization of the module under test. In fact, the incompleteness of manufacturers' data and the knowledge of physical parameters are the main source of inaccuracy in existing modelling approaches. The proposed approach is applied to a four lumped parameters model of a Conergy E215P solar module. Tests are performed under natural light. The parameter identification procedure is described in deta…
Extending the Power Range of a Solar Inverter
2018
Solar inverters feature a minimum and maximum limit of the maximum power point voltage. Overcoming these limits leads to a disconnection of the power equipment, thus wasting the solar energy. In this paper, a solution to extend the power range of a solar inverter is presented. The proposed solution extends he minimum maximum power point limit of a commercial solar inverter by means of a battery energy storage system, including a DC/DC power converter. The battery energy storage system is connected in series to the photovoltaic module. If the photovoltaic module voltage drops below the minimum maximum power point limit, the battery energy storage system is enabled thus boosting the input vol…
Laser Beam Induced Current measurements on Dye Sensitized Solar Cells and thin film CIG(S,SE)2 modules
2017
Calculating the efficiency of a solar cell depends on a precise knowledge of its area. Indeed, the photoresponse uniformity is essential to improve the manufacturing process. In this work we report on Laser Beam Induced Current measurements performed on CIG(S,Se)2 modules and Dye Sensitized Solar Cells. These measurements, performed via a green and a red HeNe lasers both operating at an optical irradiance of 1 Sun, allowed to obtain an accurate photoresponse map of the specimens and highlighted the non-uniformities with a spatial resolution of 400 μm and 80 μm, respectively.
Ecological and social impacts of photovoltaic solar power plants and optimization of their locations in northern Chile
2017
Large scale photovoltaic (PV) solar power plants are gaining popularity in Chile. Solar energy potential in northern Chile is one of the best worldwide and true deserts are considered ideal environments for solar power plant projects. Atacama Desert is one of the driest places on earth. Nevertheless, northern Chile is home for many endemic species with 40 different vegetation types. The thesis presents studies of ecological effects (I-II) and location optimization of PV solar power plants in northern Chile (III). For ecological impacts two types of PV solar power plant technologies were studied: fixed mount solar plant and solar- tracking mounts. Study units were placed below the mounts or …
Eiropas Savienības aģentūras,to izveidošana un pilnvarošana
2018
Eiropas Savienības aģentūras ieņem aizvien nozīmīgāku lomu Eiropas Savienības administrācijā. To kopskaits šobrīd pārsniedz četrdesmit un tām piešķirto pilnvaru apjoms pēdējo desmit gadu laikā ir ievērojami palielinājies. Šā darba mērķis ir noskaidrot, kas ir Eiropas Savienības aģentūras, kāda ir to loma Eiropas Savienības administrācijā un kādi ir ierobežojumi šo aģentūru izveidošanai un pilnvarošanai. Mērķa sasniegšanai tika aplūkots Eiropas Savienības aģentūras jēdziens Komisijas dokumentos un arī juridiskajā literatūrā. Tāpat tika analizēta arī EST prakse un juridiskā literatūra saistībā ar Eiropas Savienības aģentūru izveidošanu un pilnvaru nodošanu tām. Darba noslēgumā tika noskaidrot…
Multi-objective Optimization for Computation Offloading in Fog Computing
2018
Fog computing system is an emergent architecture for providing computing, storage, control, and networking capabilities for realizing Internet of Things. In the fog computing system, the mobile devices (MDs) can offload its data or computational expensive tasks to the fog node within its proximity, instead of distant cloud. Although offloading can reduce energy consumption at the MDs, it may also incur a larger execution delay including transmission time between the MDs and the fog/cloud servers, and waiting and execution time at the servers. Therefore, how to balance the energy consumption and delay performance is of research importance. Moreover, based on the energy consumption and delay,…