Searched for: author:"Ferreira, J.A."
(1 - 20 of 47)

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Liu, D. (author), Polinder, H. (author), Abrahamsen, Asger B. (author), Ferreira, J.A. (author)
This paper aims at assessing the potential of partially superconducting generators for 10 MW direct-drive wind turbines by investigating their performance for a very wide range of excitation currents. Performance indicators such as shear stress and efficiency and other generator characteristics are compared for 12 different generator topologies....
journal article 2017
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Prasanth, V. (author), Bandyopadhyay, S. (author), Bauer, P. (author), Ferreira, J.A. (author)
This paper deals with a generic methodology to evaluate the magnetic parameters of contactless power transfer systems. Neumann's integral has been used to create a matrix method that can model the magnetics of single coils (circle, square, rectangle). The principle of superposition has been utilized to extend the theory to multi-coil...
journal article 2017
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Strous, T.D. (author), Shipurkar, U. (author), Polinder, H. (author), Ferreira, J.A. (author)
In this paper, the brushless DFIM based wind turbine drive-train topology is compared to the DFIG based and PM generator based drive-train topologies, that are most commonly applied in modern wind turbines. The comparison will be based on a 3:2MW case study wind turbine. By using FE based multi-objective optimization, optimized generator designs...
journal article 2016
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Liu, D. (author), Polinder, H. (author), Abrahamsen, Asger Bech (author), Ferreira, J.A. (author)
Superconducting synchronous generators (SCSGs) are being proposed for 10-MW direct-drive wind turbines, because of their advantages of low weight and compactness. So far, however, there has not been a commonly accepted design philosophy of SCSGs and various possibilities with many tradeoffs remain for study. Partially SCSGs are considered a...
conference paper 2016
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Mackay, L.J. (author), Hailu, T.G. (author), Chandra Mouli, G.R. (author), Ramirez Elizondo, L.M. (author), Ferreira, J.A. (author), Bauer, P. (author)
The traditional ac power system is challenged by the increased amount of distributed energy resources. Enormous changes and investments are necessary in order to achieve an ac smart grid capable of coping with the challenges introduced. In dc, solutions seem to be more straightforward since most of the distributed energy sources and most of the...
conference paper 2015
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Bang, D. (author), Jang, G.W. (author), Hwang, S.H. (author), Han, P.W. (author), Kim, J.W. (author), Koo, D.H. (author), Polinder, H. (author), Ferreira, J.A. (author)
conference paper 2014
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Ferreira, J.A. (author)
Electrical power converter for converting electrical power of a power source connected or connectable at an input to electrical DC-power at an output, wherein between the input and the output a first circuit of submodules is provided, wherein said first circuit of submodules and the power source form a primary power loop and wherein each...
patent 2014
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Cvoric, D. (author), Lahaye, D. (author), De Haan, S.W.H. (author), Ferreira, J.A. (author)
Due to increasing levels of fault currents, Fault Current Limiters (FCLs) are expected to play an important role in the protection of future power grids. Inductive saturable FCLs are particularly interesting due to their inherent reaction on the fault. Many different configurations have been proposed in literature. Being difficult or impossible...
report 2013
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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
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Vu Xuan, H. (author), Lahaye, D. (author), Polinder, H. (author), Ferreira, J.A. (author)
The use of slotted stator permanent-magnet machines with concentrated windings is increasing in industry. In this paper, the effect of the slot opening on flux linkage, internal voltage, mean torque, rotor eddy current loss and stator iron losses is evaluated. This gives new insight into the influence of slotting on the performance of machines...
report 2012
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Van der Pijl, F.F.A. (author), Ferreira, J.A. (author), Bauer, P. (author), Castilla, M. (author)
The invention relates to an adaptive controlling method for controlling energy- supplied by an electrical source (14) to a resonance tank (Cr, Lr) that is connectable to an electric load (13a, 13b). The method comprises the step of determining an energy amount to be supplied to the tank (Cr, Lr), based on information of energy in the resonance...
patent 2011
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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
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Baalbergen, F. (author), Bauer, P. (author), Ferreira, J.A. (author)
Diesel generators in small electricity grids are mostly not used in a very efficient way. The reason for this is twofold. First of all, the efficiency of a diesel generator is dependent on the ratio determined by the average power divided by the peak power of the generator. The smaller this ratio is, the lower the efficiency. Furthermore, some...
journal article 2009
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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
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Bang, D. (author), Polinder, H. (author), Shrestha, G. (author), Ferreira, J.A. (author)
conference paper 2009
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Zhou, Y. (author), Bauer, P. (author), Ferreira, J.A. (author), Pierik, J. (author)
Doubly fed induction generator (DFIG) still shares a large part in today's wind power market. It provides the benefits of variable speed operation cost-effectively, and can control its active and reactive power independently. Crowbar protection is often adopted to protect the rotor-side voltage source converter (VSC) from transient overcurrent...
journal article 2009
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Zhao, D. (author), Ferreira, J.A. (author), Roc'h, A. (author), Leferink, F. (author)
Filters used in electromagnetic interference suppression are often described in literature on drive systems and have become a standard solution in industry. The effect of the commercial off-the-shelf filter depends significantly on how it is installed. A model that includes the installation parameters is made first and then the parameters of the...
journal article 2009
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Ferreira, J.A. (author), Yuan, Z. (author), De Haan, S.W.H. (author)
The invention relates to a power flow controller, comprising at least one first converter coupled with a power transmission line, and at least one second converter coupled with a power source, wherein said power source operates at a predeter-mined first frequency and connects to the power transmission line, said controller further comprising...
patent 2008
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Kruit, P. (author), Ferreira, J.A. (author)
The invention relates to compensation device for a magnetic field generated through electric traction in a tram or train transport system that comprises an overhead line and rails, the overhead line and rails during operation being live, wherein a predetermined section of the overhead line and rails is provided with adjacent circuits, each of...
patent 2007
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Bang, D.J. (author), Polinder, H. (author), Ferreira, J.A. (author), van Rooij, R.P.J.O.M. (author)
conference paper 2007
Searched for: author:"Ferreira, J.A."
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