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  • 1.
    Harnefors, Lennart
    et al.
    Mälardalen University. Royal Institute of Technology (KTH), Stockholm, Sweden.
    Hinkkanen, M.
    Helsinki University of Technology, Espoo, Finland.
    Wallmark, O.
    Royal Institute of Technology (KTH), Stockholm, Sweden.
    Guest Editorial2016In: IET Electric Power Applications, ISSN 1751-8660, E-ISSN 1751-8679, Vol. 10, no 5Article in journal (Refereed)
  • 2.
    Harnefors, Lennart
    et al.
    KTH, School of Electrical Engineering (EES), Electric power and energy systems.
    Hinkkanen, Marko
    School of Electrical Engineering, Aalto University, Espoo, Finland.
    Wallmark, Oskar
    KTH, School of Electrical Engineering (EES), Electric power and energy systems.
    Guest editorial - Special issue on permanent-magnet synchronous reluctance machines and their applications2016In: IET Electric Power Applications, ISSN 1751-8660, E-ISSN 1751-8679, Vol. 10, no 5, p. 311-Article, review/survey (Other academic)
  • 3.
    Lundström, L.
    et al.
    Division for Electricity and Lightning Research, Uppsala University, Ångström Laboratory.
    Gustavsson, Rolf
    Vattenfall Research & Development.
    Aidanpää, Jan-Olov
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Mechanics of Solid Materials.
    Dahlbäck, N.
    Division for Electricity and Lightning Research, Uppsala University, Ångström Laboratory.
    Leijon, Mats
    Division for Electricity and Lightning Research, Uppsala University, Ångström Laboratory.
    Influence on the stability of generator rotors due to radial and tangential magnetic pull force2007In: IET Electric Power Applications, ISSN 1751-8660, E-ISSN 1751-8679, Vol. 1, no 1, p. 1-8Article in journal (Refereed)
    Abstract [en]

    Forces due to nonuniform airgaps in rotating electrical machines have been a research topic for over 100 years. However, most research in the area of rotating electrical machines has been performed on motors. Large forces in hydropower generators can lead to expensive damage and failures. Therefore, it is of interest to calculate the forces that arise in a large synchronous generator with an eccentric rotor and study the influence these forces have on the stability of the generator rotor. A 74 MVA synchronous hydropower generator was simulated with an eccentric rotor, using a time-stepping finite-element technique. The forces were calculated using Coulomb's virtual-work method and simulations were performed for no-load and load cases. The resulting force was found to be reduced significantly when a damper winding was taken into account. An interesting effect of the rotor damper winding was that it reduced the eccentricity force and introduced a force component perpendicular to the direction of eccentricity. The results from the finite-element simulations were used to determine how the forces affect the stability of the generator rotor. Damped natural eigenfrequencies and damping ratio for load and no-load conditions are presented. When applying the forces computed in the time-dependent model, the damped natural eigenfrequencies were found to increase and the stability of the generator rotor was found to be reduced compared with when the forces were computed in a stationary model.

  • 4.
    Parwal, Arvind
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences.
    Hjalmarsson, Johannes
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Electricity.
    Potapenko, Tatiana
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Electricity.
    Anttila, Sara
    Leijon, Jennifer
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Electricity.
    Kelly, James
    Temiz, Irina
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Electricity.
    Boström, Cecilia
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Electricity.
    Leijon, Mats
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Electricity.
    Grid Impact and Power quality Assessment in wave Energy Parks: Different layouts and Power Penetrations using Energy StorageIn: IET Electric Power Applications, ISSN 1751-8660, E-ISSN 1751-8679, ISSN 1751-8679Article in journal (Refereed)
  • 5.
    Peretti, Luca
    et al.
    ABB Corporate Research, Sweden.
    Pathmanathan, M.
    ABB Corporate Research.
    Ikram ul Haq, O.
    ABB Corporate Research.
    Sahoo, S.
    ABB Corporate Research.
    Robust harmonic detection, classification and compensation method for electric drives based on the sparse FFT and the Mahalanobis distance2017In: IET Electric Power Applications, ISSN 1751-8660, E-ISSN 1751-8679, Vol. 11, no 7, p. 1177-1186Article in journal (Refereed)
    Abstract [en]

    This work presents a method for the robust detection, classification and possible compensation of harmonics in electric drives during real-time operation, with the aim of providing a framework for monitoring and diagnostic without the need of additional hardware. The detection is performed with a sparse fast Fourier transform algorithm, for its lower computational effort when the signals are sparse (which, by definition, contain few meaningful spectral lines). The classification is performed on the results of the signal frequency analysis by means of the Mahalanobis distance concept, improving the robustness and noise rejection properties of the method. The compensation part relies on a family of regulators in parallel, each operating in the rotating reference frame of the harmonic to be cancelled. The theoretical background is followed by a discussion on the implementation and the interaction of the three blocks for a successful real-time operation. The system was tested in laboratory and proved to fulfil the requirements, by running in parallel to a vector control for synchronous machines. It was also found that the method is a useful tool to determine the presence of unknown harmonics in an electric drive system, thus potentially providing early warnings of unexpected failures.

  • 6.
    Peretti, Luca
    et al.
    ABB Corporate Research.
    Sandulescu, P.
    ABB Corporate Research.
    Zanuso, G.
    ABB Corporate Research.
    Self-commissioning of flux-linkage curves of synchronous reluctance machines in quasi-standstill condition2015In: IET Electric Power Applications, ISSN 1751-8660, E-ISSN 1751-8679, Vol. 9, no 9, p. 642-651Article in journal (Refereed)
    Abstract [en]

    This study presents a self-commissioning procedure for the estimation of the flux linkage curves of synchronous reluctance machines. The procedure exploits a quasi-standstill condition obtained by imposing fast torque oscillations. The flux linkage is calculated by means of a pure integration of the voltages and currents. With respect to the existing procedures, the proposed one tackles the problem of the limited knowledge of the core losses in the electrical machine, which is shown to induce erroneous estimation results for the case under investigation. A theoretical analysis supported by extensive laboratory measurements is shown, proving the effectiveness of the proposed approach.

  • 7.
    Peretti, Luca
    et al.
    ABB Corporate Research Center, Västerås, Sweden.
    Zigliotto, M.
    University of Padova, Italy.
    Automatic procedure for induction motors parameters estimation at standstill2012In: IET Electric Power Applications, ISSN 1751-8660, E-ISSN 1751-8679, Vol. 6, no 4, p. 214-224Article in journal (Refereed)
    Abstract [en]

    The study presents a self-commissioning procedure for the automatic parameter estimation of three-phase induction motor drives. The procedure consists of a step-by-step approach with different test signals to obtain the parameter values while maintaining the motor at standstill. The actual implementation is capable of mapping both inverter and motor parameters non-linearities, providing accurate data for the tuning of common current regulators and for advanced sensorless drives as well. Theoretical and experimental results are provided, proving the effectiveness of the procedure.

  • 8.
    Sjökvist, Stefan
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Electricity.
    Eklund, Petter
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Electricity.
    Eriksson, Sandra
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Electricity.
    Determining demagnetisation risk for two PM wind power generators with different PM material and identical stators2016In: IET Electric Power Applications, ISSN 1751-8660, E-ISSN 1751-8679, Vol. 10, no 7, p. 593-597Article in journal (Refereed)
    Abstract [en]

    Ways to utilise ferrite permanent magnets (PMs), in a better way has been in focus the last couple of years since the use of neodymium-iron-boron (NdFeB) PMs has been debated. While ferrite PMs offer a low-cost alternative to rare- earth PMs, it is a trade-off for lower energy density. Depending on the type of PM and if the PMs are surface mounted or buried, the risk of demagnetisation during a fault condition can vary significantly between machines. In this study, the demagnetisation risk of two electrically similar generators with identical stators has been studied during several short- circuit faults at different temperatures. The study is simulation-based, and the results show that the generator with the ferrite rotor will suffer from a small but not significant amount of demagnetisation in the worst, three-phase-neutral, short-circuit case at a temperature of 5°C, whereas the NdFeB PMs will suffer from partial demagnetisation if a fault occurs at 120°C. For operational temperatures between 20 and 60°C both generators will sustain a short-circuit event. 

  • 9.
    Theocharis, Andreas
    et al.
    Delft Univ Technol, Fac EEMCS, Mekelweg 4, NL-2628 CD Delft, Netherlands.
    Popov, M.
    Delft Univ Technol, Fac EEMCS, Mekelweg 4, NL-2628 CD Delft, Netherlands.
    Modelling of foil-type transformer windings for computation of terminal impedance and internal voltage propagation2015In: IET Electric Power Applications, ISSN 1751-8660, E-ISSN 1751-8679, Vol. 9, no 2, p. 128-137Article in journal (Refereed)
    Abstract [en]

    The goal of this work is to develop an efficient numerical model of foil-type windings. An equivalent lumped-parameter circuit model is presented, which is suitable for the computation of the terminal impedance within a broad frequency range and for internal voltage propagation studies. Owing to the special geometrical winding shape, particular attention has been paid to the calculation of the involved lumped parameters where efficient and accurate formulas for parameter determination are presented. The core influence is investigated for the broad frequency range by taking into account the frequency dependency of core material properties. Simulated results compared to measurements show that the proposed equivalent circuit in combination with the applied formulas for parameter determination can be used with full success for the computation of the terminal impedance and internal voltage distribution studies. © The Institution of Engineering and Technology 2015.

  • 10.
    Zanuso, G.
    et al.
    ABB Corporate Research.
    Peretti, Luca
    ABB Corporate Research.
    Zigliotto, M.
    University of Padova.
    Permanent magnet synchronous machines flux linkage estimation with zero steady-state error and its field-programmable gate array implementation2015In: IET Electric Power Applications, ISSN 1751-8660, E-ISSN 1751-8679, Vol. 9, no 4, p. 332-343Article in journal (Refereed)
    Abstract [en]

    The paper analyses a combined current model-voltage model estimator for flux linkages in permanent magnet synchronous machines, with the capability of converging to exact flux estimation even in presence of mismatches because of magnetic saturation. As a trend in next-generation electric drives, the whole algorithm, including both the flux estimator and the standard field-oriented control, has been implemented in a field-programmable gate array (FPGA) chip. Simulations and experimental tests, along with some figures for the FPGA selection, have been included in the study.

  • 11.
    Zanuso, Giovanni
    et al.
    KTH, School of Electrical Engineering and Computer Science (EECS), Electric Power and Energy Systems.
    Peretti, Luca
    KTH, School of Electrical Engineering and Computer Science (EECS), Electric Power and Energy Systems.
    Sandulescu, Paul
    ABB Oy, Finland.
    Model-based flux weakening strategy for synchronous machines without additional regulators2018In: IET Electric Power Applications, ISSN 1751-8660, E-ISSN 1751-8679, Vol. 12, no 9, p. 1283-1290Article in journal (Refereed)
    Abstract [en]

    This study proposes a model-based control strategy for flux weakening operation of a synchronous reluctance machine, with a methodology that is extendible to any synchronous machine. The strategy leverages in the presence of digital non-linear models that describe the relation between currents and flux linkages in the machine. Such models are usually needed for conventional maximum-torque-per-ampere control and sensorless control, but here they are exploited to achieve flux-weakening operation without the need of flux weakening regulators, ensuring a seamless transition between the operating regions of the machine. The external voltage regulation loop for flux weakening is thus eliminated and substituted by a combination of look-up tables and binary searches, which are executed within one digital control period and which generate the required current and voltage references that fulfil the drive limitations. The method can also be coupled with mechanisms to compensate for magnetic parameter inaccuracies, to achieve an accurate tracking of the reference torque. The proposed solution is simulated and validated in a laboratory test bench on an 11 kW synchronous reluctance machine.

1 - 11 of 11
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