Searched for: department%3A%22Electrical%255C%252BSustainable%255C%252BEnergy%22
(1 - 20 of 61)
- document
- Bang, D. (author), Polinder, H. (author), Shrestha, G. (author), Ferreira, J.A. (author) conference paper 2009
- document
-
Shrestha, G. (author), Polinder, H. (author), Bang, D. (author), Jassal, A.K. (author), Ferreira, J.A. (author)A direct drive generator used in wind turbine has high energy yield compared to other drivetrain topologies and low maintenance is expected as the technology matures. On the other hand direct drive generator weight and size increases rapidly when scaled up to larger units. This paper will investigate the possibility of weight reduction of large...conference paper 2009
- document
-
Veldman, E. (author), Geldtmeijer, D.A.M. (author), Slootweg, J.G. (author)The transition towards a more sustainable energ y supply system causes changes in the supply and demand of energ y. It requires a more flexible and efficient operation of the electricity distribution grids. It calls for a smart grid with intelligent control embedded in the grids to incorporate electricity storage and controllable loads. This...conference paper 2009
- document
-
Bajracharya, G. (author), Koltunowicz, T. (author), Negenborn, R.R. (author), Papp, Z. (author), Djairam, D. (author), De Schutter, B. (author), Smit, J.J. (author)In this paper, a model-predictive control based framework is proposed for modeling and optimization of the health state of power system equipment. In the framework, a predictive health model is proposed that predicts the health state of the equipment based on its usage and maintenance actions. Based on the health state, the failure rate of the...conference paper 2009
- document
-
Ani, S.O. (author), Polinder, H. (author), Ferreira, J.A. (author), Ockels, W.J. (author)This paper discusses the possibilities of applying high temperature superconducting (HTS) synchronous motor to Superbus, an alternative and sustainable type of public transportation developed at TU Delft. Two important factors within the Superbus drive that influence the operating range are weight and efficiency: increasing the weight results in...conference paper 2009
- document
-
Jäger, K. (author), Schulte, K. (author), Bittkau, K. (author), Ermes, A.M. (author), Zeman, M. (author), Pieters, B.E. (author)The scattering properties of transparent conductive oxide (TCO) layers are fundamentally related to the performance of thin film silicon solar cells. In this study we introduce an experimental technique to access light scattering properties at textured TCO-silicon interfaces. Therefore we prepared a sample with a polished microcrystalline...conference paper 2011
- document
-
Scorticati, D. (author), Skolski, J.Z.P. (author), Romer, G.R.B.E. (author), Huis in 't Veld, A.J. (author), Workum, M.J. (author), Theelen, M.J. (author), Zeman, M. (author)In this work, we studied the feasibility of surface texturing of thin molybdenum layers on a borosilicate glass substrate with Ultra-Short Laser Pulses (USLP). Large areas of regular diffraction gratings were produced consisting of Laserinduced periodic surface structures (LIPSS). A short pulsed laser source (230 fs-10 ps) was applied using a...conference paper 2012
- document
-
Isabella, O. (author), Battaglia, C. (author), Ballif, C. (author), Zeman, M. (author)Nano-scale randomly textured front transparent oxides are superposed on micro-scale etched glass substrates to form modulated surface textures. The resulting enhanced light scattering is implemented in single and double junction thin-film silicon solar cells.conference paper 2012
- document
-
Isabella, O. (author), Elshinawy, M.A.A. (author), Solntsev, S. (author), Zeman, M. (author)Superstrate thin-film silicon triple-junction solar cells on 2-D gratings were optimized using opto-electrical modeling. Tuning the thickness of intermediate and back reflectors and the band gap of the middle cell resulted in 17% initial efficiency.conference paper 2012
- document
-
Van der Geest, M. (author), Wolmarans, J.J. (author), Polinder, H. (author), Ferreira, J.A. (author), Zeilstra, D. (author)High speed fault tolerant permanent magnet machines have strong asynchronous airgap harmonics, making them susceptible to rotor eddy-current losses. These losses can be reduced by using novel high resistivity materials like plastic bonded magnets and carbon fiber reinforced retaining sleeves. This paper examines by numerical studies the...conference paper 2012
- document
-
Xue, H. (author), Popov, M. (author)Large transient overvoltages are normally caused by vacuum circuit breaker (VCB) switching operation during disconnection of induction motors. In this paper VCBs, cables, generators, busbars, induction motors and surge arresters are modeled by making use of ATP-EMTP. Switching transient overvoltages of four typical induction motors are analyzed...conference paper 2013
- document
-
Popov, M. (author), Rietveld, G. (author), Radojevic, Z. (author), Terzija, V. (author)This paper presents a fault location algorithm that can be used to accurately locate the fault at any place along mixed line-cable transmission corridors. The algorithm is an impedance based line/cable parameter dependent algorithm. The fault location algorithm is derived using distributed line model, modal transformation theory and Discrete...conference paper 2013
- document
-
Hoogendorp, G. (author), Popov, M. (author), Van der Sluis, L. (author)Transmission of electric energy at high voltage levels is mainly performed by overhead lines. Nowadays, an increasing amount of power grid operators are replacing overhead transmission lines by underground cables. Cable presence in power systems may have consequences for the behavior of the total system, since cables have much larger capacitance...conference paper 2013
- document
-
Rodrigues, S. (author), Bauer, P. (author), Pierik, J. (author)Although, only in recent years, northern European countries started to install large offshore wind farms, it is expected that by 2020, several dozens of far and large offshore wind farms (FLOWFs) will be built. These FLOWFs will be constituted of a considerable amount of wind turbines (WTs) packed together, leading to an energy density increase....conference paper 2013
- document
-
Kostopoulos, D. (author), Liu, D. (author), Genani, G. (author), Polinder, H. (author)Offshore wind is considered a vital component of the future large scale renewable generation portfolio. Intense R&D effort is occurring in both the technology and the supply chain aiming at cost reduction. The drivetrain of wind turbines is an area of continuous evolution with currently no one standard configuration in the industry. It is...conference paper 2013
- document
-
Zuijderduin, R. (author), Chevtchenko, O. (author), Smit, J.J. (author), Aanhaanen, G. (author), Ross, R. (author)The electricity grid of the Netherlands is changing. There is a call of society to use more underground cables, less overhead lines (OHL) and to reduce magnetic emissions. At the same time, parts of the future transmission grid need strengthening depending on the electricity demand in the coming decades [1]. Novel high temperature superconductor...conference paper 2014
- document
-
Abrahamsen, A.B. (author), Magnusson, N. (author), Jensen, B.B. (author), Liu, D. (author), Polinder, H. (author)An MgB2 race track coil intended for demonstrating a down scaled pole of a 10 MW direct drive wind turbine generator has been designed. The coil consists of 10 double pancake coils stacked into a race track coil with a cross section of 84 mm x 80 mm. The length of the straight section is 0.5 m and the diameter of the end sections is 0.3 m....conference paper 2014
- document
-
Simons, C.A.B.A.E. (author), Sanabria-Walter, C. (author), Polinder, H. (author)During the past decades, superconducting electrical machines have become more suitable to replace conventional iron based designs, because of their lower weight and higher torque density. These properties make them good candidates for use in More Electric Aircraft (MEA). Especially helicopter propulsion systems could benefit from the increased...conference paper 2014
- document
-
Hart, K. (author), McDonald, A. (author), Polinder, H. (author), Corr, E. (author), Carroll, J. (author)This paper investigates geared and direct-drive permanent magnet generators for a typical offshore wind turbine, providing a detailed comparison of various wind turbine drivetrain configurations in order to minimise the Cost of Energy. The permanent magnet generator topologies considered include a direct-drive machine and single stage, two-stage...conference paper 2014
- document
-
Abrahamsen, A.B. (author), Magnusson, N. (author), Liu, D. (author), Stehouwer, E. (author), Hendriks, B. (author), Polinder, H. (author)A superconducting direct drive generator based on field windings of MgB2 superconducting tape is proposed as a solution by mounting the generator in front of the blades using a king-pin nacelle design for offshore turbines with power ratings larger than 10 MW as investigated in the INNWIND.EU project.conference paper 2014
Searched for: department%3A%22Electrical%255C%252BSustainable%255C%252BEnergy%22
(1 - 20 of 61)