Klosse R.,DEWI GmbH
European Wind Energy Conference and Exhibition 2010, EWEC 2010 | Year: 2010
The main changing's in the technical guideline TR3, which are resulting out of the German renewable energy feed in law extension (SDLWindV), are measurements of the reactive power capability, the ramp rate limitation after grid false and the set point control for active and reactive power in accuracy and reconnection time. The most complex and costly part is the documentation about the behavior during grid false. It is not only required to ride through a voltage dip (LVRT) also the turbine has to deliver a high value of reactive power immediately after the voltage is dropped down. In the new German feed in law for renewables from 2009 the system stability is considered substantial. The main focus is that especially the wind turbine generators are work more and more like big power station. The requirements of the German Transmission Code from 2007 for high volt connections and for the medium voltage connection (BDEW Richtlinie) from 2008 are legitimate by the law and are precised in some topics by in the extension of the EEG the SDLWindV form summer 2009. For that wind turbine how fulfill all requirements the fee will increase. Turbines connected after June of 2010 have to fulfill everything anyway. But how to ensure the availability of the new requirements? For that the handling of power quality measurement has change. The technical guideline TR3 of the power quality measurement of the Fordergesellschaft Windenergie (FGW, fund association wind energy) gets the now the new 20th revision. This TR3 is related mainly to the IEC 61400-21 ed. 2 but has some significant extensions. Additional two new technical guidelines the TR4 for modeling and the TR8 for certification are introduced and are now in the revision 4 and revision 1. Out of the fact that this guidelines still under development new changing's are expected up to the end of 2009 or at the beginning of 2010. Out of the changing's of the IEC 61400-21 from edition 1 to edition 2 the MEASNET procedure was adduced as well. MEASNET is a cluster of international measurement institutions in Europe and USA for to harmonizes measurements procedures. DEWI will presents the most important changing's of these guidelines in the actual version at time of presenting. As well this presentation will gives an overview about there experience to perform such measurement. The main changing's in the technical guideline TR3, which are resulting out of the German renewable energy feed in law extension (SDLWindV), are measurements of the reactive power capability, the ramp rate limitation after grid false and the set point control for active and reactive power in accuracy and reconnection time. The most complex and costly part is the documentation about the behavior during grid false. It is not only required to ride through a voltage dip (LVRT) also the turbine has to deliver a high value of reactive power immediately after the voltage is dropped down. Source
Foreman R.J.,Karlsruhe Institute of Technology |
Emeis S.,Karlsruhe Institute of Technology |
Canadillas B.,DEWI GmbH
Boundary-Layer Meteorology | Year: 2014
A turbulence parametrization for wind speed in the stable boundary layer consisting of a single empirical parameter is proposed without the use of the eddy viscosity concept or turbulent kinetic energy equation. Instead, a drag-coefficient-type formulation as a function of the bulk Richardson number has been found to be able to reproduce observed stable boundary-layer wind speeds as effectively as a model based on the eddy viscosity approach. The advantage of this simpler approach is that the model can, in theory, be modified more easily for certain applications, such as the effects of large-scale wind parks on mesoscale meteorology. © 2014, Springer Science+Business Media Dordrecht. Source
Agency: Cordis | Branch: FP7 | Program: CP-FP | Phase: ENERGY-2007-2.3-03 | Award Amount: 2.68M | Year: 2008
One of the major causes of failures of mechanical systems (e.g. drive trains, pitch systems, and yaw systems) in wind turbines is insufficient knowledge of the loads acting on these components. The objective of this pre-normative project is to set up a methodology that enables better specification of design loads for the mechanical components. The design loads will be specified at the interconnection points where the component can be isolated from the entire wind turbine structure (for gearboxes for instance the interconnection points are the shafts and the attachments to the nacelle frame). The focus will be on developing guidelines for measuring load spectra at the interconnection points during prototype measurements and to compare them with the initial design loads. Ultimately, the new procedures for the mechanical components will be brought at the same high level as the state-of-the-art procedures for designing and testing rotor blades and towers which are critical to safety. A well balanced consortium, consisting of a turbine manufacturer, component manufacturer, certification institute, and R&D institutes will describe the current practice for designing and developing mechanical components. Based on this starting point, the project team will draft improved procedures for determining loads at the interconnection points. The draft procedures will be applied to three case studies with each a different focus, viz. determining loads at the drive train, pitch system, and yaw system; the latter one taking into account complex terrain. The procedures will be assessed by the project team and depending on the outcome the procedures will be updated accordingly and disseminated. All partners will incorporate the new procedures in their daily practices for designing turbines and components, certifying them, and carrying out prototype measurements. Project results will be submitted to relevant standardisation committees.
Agency: Cordis | Branch: H2020 | Program: IA | Phase: LCE-03-2015 | Award Amount: 17.11M | Year: 2016
In ELICAN, a strong team of complementary European companies with worldwide leading presence in the Wind Energy industry join forces to provide the market with a disruptive high-capacity and cost-reducing integrated substructure system for deep offshore wind energy. The technology is exceptionally fitted to meet the technical and logistical challenges of the sector as it moves into deeper locations with larger turbines, while allowing for drastic cost reduction. This project will design, build, certify and fully demonstrate in operative environment a deep water substructure prototype supporting Adwens 5MW offshore wind turbine, the be installed in the Southeast coast of Las Palmas (Canary Islands). It will become the first bottom-fixed offshore wind turbine in all of Southern Europe and the first one worldwide to be installed with no need of heavy-lift vessels. The revolutionary substructure consists in an integrated self-installing precast concrete telescopic tower and foundation that will allow for crane-free offshore installation of the complete substructure and wind turbine, thus overcoming the constraints imposed by the dependence on heavy-lift vessels. It will allow for a full inshore preassembly of the complete system, which is key to generate a highly industrialized low-cost manufacturing process with fast production rates and optimized risk control. The main benefits to be provided by this ground-breaking technology are: Significant cost reduction (>35%) compared with current solutions. Direct scalability in terms of turbine size, water depth, infrastructure and installation means. Complete independence of heavy-lift vessels Excellently suited for fast industrialized construction. Robust and durable concrete substructure for reduced OPEX costs and improved asset integrity. Suitable for most soil conditions, including rocky seabeds. Enhanced environmental friendliness regarding both impact on sea life and carbon footprint.
DEWI GmbH | Date: 2014-03-27
Watches, watch cases, buckles and clasps for watch straps, movements for timepieces, watch straps, watch dials, winding rings, alarm clocks, clocks,wall clocks, watch boxes, pocket watches; jewelry, namely bracelets, rings, necklaces, earrings, pendants, brooches, cufflinks; all the aforesaid goods with the exception of a so-called napolon coin or an imitation thereof.