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  • 1.
    Antonello, R.
    et al.
    University of Padova.
    Carraro, M.
    University of Padova.
    Peretti, L.
    ABB Corporate Research.
    Zigliotto, M.
    University of Padova.
    Hierarchical scaled–states direct predictive control of synchronous reluctance motor drives2016In: IEEE transactions on industrial electronics (1982. Print), ISSN 0278-0046, E-ISSN 1557-9948, Vol. 63, no 8, p. 5176-5185Article in journal (Refereed)
  • 2.
    Antonello, R.
    et al.
    University of Padova.
    Peretti, L.
    ABB Corporate Research.
    Tinazzi, F.
    University of Padova.
    Zigliotto, M.
    University of Padova.
    Self-commissioning calculation of dynamic models for synchronous machines with magnetic saturation using flux as state variable2018Conference paper (Refereed)
  • 3.
    Antonello, Riccardo
    et al.
    University of Padova.
    Peretti, Luca
    KTH, School of Electrical Engineering and Computer Science (EECS), Electric Power and Energy Systems.
    Tinazzi, Fabio
    University of Padova.
    Zigliotto, Mauro
    University of Padova, Italy.
    Self-commissioning calculation of dynamic models for synchronous machines with magnetic saturation using flux as state variable2019In: The Journal of Engineering, ISSN 1872-3284, E-ISSN 2051-3305, no 17, p. 3609-3613Article in journal (Refereed)
    Abstract [en]

    This paper deals with the non-linear modelling of synchronous machines by using the flux linkage as a state variable.The model is inferred from a conventional set of measurements where the relation between the currents and the flux linkages inthe rotating reference frame (also known as dq reference frame) are known by measurements or estimated through finite-element simulations. In particular, the contribution of this paper is twofold: first, it proposes a method to extract the non-linearmodel information which can be easily implemented in electric drives, without the need of offline post-processing of the data.Second, it mathematically demonstrates that the method converges to the final result in a stable way. An example based onexperimental measurements of the current-to-flux look-up tables of an 11-kW synchronous reluctance machine is shown,proving the feasibility of the proposed method.

  • 4.
    Bernard, C.
    et al.
    University of Padova.
    Bolognani, S.
    University of Padova.
    Peretti, L.
    University of Padova.
    Zigliotto, M.
    University of Padova.
    Steering chain HIL simulator for steer-by-wire systems2006Conference paper (Refereed)
  • 5.
    Bianchi, N.
    et al.
    University of Padova.
    Bolognani, S.
    University of Padova.
    Pré, M. Dai
    University of Padova.
    Tomasini, M.
    University of Padova.
    Peretti, L.
    University of Udine.
    Zigliotto, M.
    University of Udine.
    The steering effect - PM motor drives for automotive systems2008In: IEEE Industry Applications Magazine, ISSN 1077-2618, Vol. 14, no 2, p. 40-48Article in journal (Refereed)
  • 6.
    Bolognani, S.
    et al.
    University of Padova.
    Faggion, A.
    University of Padova.
    Peretti, L.
    University of Padova.
    Sgarbossa, L.
    University of Padova.
    Modelling and design of a direct-drive lift control with rope elasticity and estimation of starting torque2007In: IECON 2007 - 33rd Annual Conference of the IEEE Industrial Electronics Society, IEEE conference proceedings, 2007, p. 828-832Conference paper (Refereed)
    Abstract [en]

    This paper deals with position control of a direct drive rope-based lift system at mechanical brake releasing. The electrical equipment includes a high-torque, low-speed permanent magnet synchronous motor with external rotor directly connected to the rope pulley. The drive uses only stator current sensors for torque control and an incremental encoder on the motor shaft. A detailed model of the system, which comprises also rope elasticity, is presented, as wells as a load torque estimation algorithm and a feedforward action on the torque reference signal. Such reference is used to reduce the cabin falling down at brake releasing below a perceptible threshold. Final experimental results support the mathematical theory outlined in the paper, validating the proposed control strategy.

  • 7.
    Bolognani, S.
    et al.
    University of Padova.
    Faggion, A.
    University of Padova.
    Peretti, L.
    University of Padova.
    Zigliotto, M.
    University of Padova.
    Parameter sensitivity analysis of two low-cost sensorless induction motor drives2008In: Proceedings of the 39th IEEE Power Electronics Specialists Conference, 2008, p. 43-49Conference paper (Refereed)
  • 8.
    Bolognani, S.
    et al.
    University of Padova.
    Faggion, A.
    University of Padova.
    Peretti, L.
    University of Padova.
    Zigliotto, M.
    University of Padova.
    Sensorless V-type vector-controlled IM drive with inherent flux-weakening capability2008In: 4th IET International Conference on Power Electronics, Machines and Drives (PEMD 2008)2008, 2008, p. 465-469Conference paper (Refereed)
  • 9.
    Bolognani, S.
    et al.
    University of Padova.
    Peretti, L.
    University of Padova.
    Sgarbossa, L.
    University of Padova.
    Zigliotto, M.
    University of Padova.
    Improvements in power line communication reliability for electric drives by random PWM techniques2006In: Proceedings of the 32nd Annual Conference of the IEEE Industrial Electronics Society (IECON), 2006, p. 2307-2312Conference paper (Refereed)
  • 10.
    Bolognani, S.
    et al.
    University of Padova.
    Peretti, L.
    University of Padova.
    Zigliotto, M.
    University of Padova.
    A novel open-loop speed estimation technique for low-cost IM drives2007In: Proceedings of the International Aegean Conference on Electrical Machines and Power Electronics (ACEMP) and ELECTROMOTION 2007 Joint Conference, 2007, p. 754-759Conference paper (Refereed)
  • 11.
    Bolognani, S.
    et al.
    University of Padova.
    Peretti, L.
    University of Padova.
    Zigliotto, M.
    University of Padova.
    Combined speed and current model predictive control with inherent field weakening features for PMSM drives2008Conference paper (Refereed)
  • 12.
    Bolognani, S.
    et al.
    University of Padova.
    Peretti, L.
    University of Padova.
    Zigliotto, M.
    University of Padova.
    High dynamic electromechanical conversion model for PMSM drives2007Conference paper (Refereed)
  • 13.
    Bolognani, S.
    et al.
    University of Padova.
    Peretti, L.
    University of Padova.
    Zigliotto, M.
    University of Padova.
    Inverter non-idealities override by repetitive control2007Conference paper (Refereed)
  • 14.
    Bolognani, S.
    et al.
    University of Padova.
    Peretti, L.
    University of Padova.
    Zigliotto, M.
    University of Padova.
    Online MTPA Control Strategy for DTC Synchronous-Reluctance-Motor Drives2011In: IEEE transactions on power electronics, ISSN 0885-8993, E-ISSN 1941-0107, Vol. 26, no 1, p. 20-28Article in journal (Refereed)
  • 15.
    Bolognani, S.
    et al.
    University of Padova.
    Peretti, L.
    University of Padova.
    Zigliotto, M.
    University of Padova.
    Parameter sensitivity analysis of an improved open-loop speed estimate for induction motor drives2008In: IEEE transactions on power electronics, ISSN 0885-8993, E-ISSN 1941-0107, Vol. 23, no 4, p. 2127-2135Article in journal (Refereed)
  • 16.
    Bolognani, S.
    et al.
    University of Padova.
    Peretti, L.
    University of Padova.
    Zigliotto, M.
    University of Padova.
    Repetitive-control-based self-commissioning procedure for inverter non-idealities compensation2008In: IEEE transactions on industry applications, Vol. 44, no 5, p. 1587-1596Article in journal (Refereed)
  • 17.
    Bolognani, S.
    et al.
    University of Padova.
    Peretti, L.
    University of Padova.
    Zigliotto, M.
    University of Padova.
    Bertotto, E.
    REEL S.p.A..
    Commissioning of electromechanical conversion models for high dynamic PMSM drives2010In: IEEE transactions on industrial electronics (1982. Print), ISSN 0278-0046, E-ISSN 1557-9948, Vol. 57, no 3, p. 986-993Article in journal (Refereed)
  • 18.
    Bolognani, Saverio
    et al.
    University of Padova.
    Bolognani, Silverio
    University of Padova.
    Peretti, L.
    University of Padova.
    Zigliotto, M.
    University of Padova.
    Design and implementation of model predictive control for electrical motor drives2009In: IEEE transactions on industrial electronics (1982. Print), ISSN 0278-0046, E-ISSN 1557-9948, Vol. 56, no 6, p. 1925-1936Article in journal (Refereed)
  • 19.
    Carraro, M.
    et al.
    University of Padova.
    Zigliotto, M.
    University of Padova.
    Peretti, L.
    ABB Corporate Research.
    FPGA-based hierarchical finite-states predictive control for PMSM drives2014Conference paper (Refereed)
  • 20.
    Costabeber, A.
    et al.
    University of Padova.
    Mattavelli, P.
    University of Padova.
    Peretti, L.
    University of Padova.
    Zigliotto, M.
    University of Padova.
    A speed loop autotuning method based on signal injection for electrical drives2010Conference paper (Refereed)
  • 21.
    Fazia, L.
    et al.
    E-Brain S.r.L..
    Peretti, L.
    University of Padova.
    Zigliotto, M.
    University of Padova.
    Repetitive control and virtual bleeder resistor for AC generator sets with harmonic-sensitive loads2008In: Proceedings of the 4th IET Power Electronics, Machines and Drives (PEMD) International Conference, 2008, p. 144-148Conference paper (Refereed)
  • 22.
    Ikram ul Haq, O.
    et al.
    ABB Corporate Research.
    Peretti, L.
    ABB Corporate Research.
    Robust automatic segregation of harmonics in electric drives by means of the Mahalanobis distance2017In: 2017 IEEE International Electric Machines and Drives Conference (IEMDC), 2017, p. 1-8Conference paper (Refereed)
    Abstract [en]

    This paper discusses the use of the Mahalanobis distance as a solution for a robust and automatic segregation of harmonics in the signals measured in electric drives, as for example the phase currents or the mechanical speed. The Mahalanobis distance is used during real-time operation to clean the results of an on-line frequency analysis, reducing the uncertainties related to frequency resolution, spectral leakage and background noise. At the same time, it is a powerful tool to classify the known harmonics from the unknown ones, thus providing the drive with valuable information that can be used for further decisional control actions. The overall theoretical background is reviewed as well as its implementation in an operational drive system. Experimental results are provided, proving the validity of the concept.

  • 23.
    Lendenmann, H.
    et al.
    ABB Corporate Research.
    Kanchan, R.
    ABB Corporate Research.
    Zelaya De La Parra, H.
    ABB Corporate Research.
    Peretti, Luca
    ABB Corporate Research.
    Method and apparatus for control of electrical machines2011Patent (Other (popular science, discussion, etc.))
    Abstract [en]

    A method for finding an operating point of an electric motor which includes the steps of generating a perturbation signal, combining the perturbation signal with a current magnitude related to a drive system of the motor or combining the perturbation signal with a power magnitude related to the motor, yielding a combined signal, and sending, based on the combined signal, a flux adjustment signal to adjust a flux of the motor. An apparatus for finding an operating point of an electric motor comprising is also presented.A method for finding an operating point of an electric motor which includes the steps of generating a perturbation signal, combining the perturbation signal with a current magnitude related to a drive system of the motor or combining the perturbation signal with a power magnitude related to the motor, yielding a combined signal, and sending, based on the combined signal, a flux adjustment signal to adjust a flux of the motor. An apparatus for finding an operating point of an electric motor comprising is also presented.

  • 24.
    Pathmanathan, M.
    et al.
    ABB Corporate Research.
    Peretti, Luca
    ABB Corporate Research.
    Real-time signal frequency analysis in variable speed drives using the sparse fast Fourier transform (sFFT)2017In: 2017 IEEE International Conference on Industrial Technology (ICIT), IEEE, 2017, p. 1053-1058Conference paper (Refereed)
    Abstract [en]

    This paper investigates the implementation and the use of the sparse fast Fourier transform algorithm in the converter control of a variable speed drive. The algorithm is proposed due to the reduction in computational complexity compared to the conventional fast Fourier transform for the special case of sparse signals. After discussing the theory and a simulation model, experimental results obtained using a field programmable gate array (FPGA) implementation are presented, showing the effectiveness of the proposed solution.

  • 25.
    Peretti, Luca
    ABB Corporate Research, Vasteras, Sweden .
    Active torque harmonic compensation for wind turbine drive trains2014In: 7th IET International Conference on Power Electronics, Machines and Drives (PEMD 2014), 2014, p. 1-6Conference paper (Refereed)
    Abstract [en]

    This paper presents a torque harmonic compensation algorithm for wind turbine applications, where the presence of a converter managing the energy conversion can be also exploited for active compensation purposes. A general scenario is described first. The algorithm is then described with its mathematical background. A modification of the algorithm is proposed in order to overcome the problem of unknown phase shift between the variables to compensate and those steering the compensation. Simulations and experimental results prove the effectiveness of the solution.

  • 26.
    Peretti, Luca
    ABB Corporate Research, Sweden.
    Digital integrators for condition monitoring: a DC and multitone signal analysis2014In: 2014 International Power Electronics Conference, IPEC-Hiroshima - ECCE Asia 2014, IEEE Computer Society, 2014, p. 3111-3118, article id 6870129Conference paper (Refereed)
    Abstract [en]

    The digital implementation of the integral operator is a delicate part in electrical drives. Many solutions are available in the literature, which avoid the well-known output drift of ideal digital integrators when a spurious DC offset is present at their input. Such solutions try to extend the integration accuracy toward the zero frequency as well, aiming to broaden their usability range for real applications (low-speed region of electrical machines, for example). So far, very few investigations have been performed as regards to the performances of driftfree integrators for cases where the integration is used within estimation and conditioning monitoring algorithms. This paper aims to investigate different known digital offset-free integrals, in terms of their output accuracy with respect to DC and multitone input signals, for a specific application where they could be exploited for condition monitoring. Simulation and experimental results are presented as well.

  • 27.
    Peretti, Luca
    ABB Corporate Research.
    Method and controller for damping vibrations in a wind power system: Verfahren und Steuergerät zur Dämpfung von Schwingungen einer Windkraftanlage2013Patent (Other (popular science, discussion, etc.))
  • 28.
    Peretti, Luca
    et al.
    ABB Corporate Research.
    Pathmanathan, M.
    ABB Corporate Research.
    Ikram ul Haq, O.
    ABB Corporate Research.
    Sahoo, S.
    ABB Corporate Research.
    Method and controller for determining an undesired condition in an electrical drive system2016Patent (Other (popular science, discussion, etc.))
    Abstract [en]

    A method for determining an undesired condition in an electrical drive system including an electrical machine and an electrical drive, wherein the method includes a) obtaining a measured signal of an electrical or mechanical parameter, b) obtaining a frequency spectrum of the measured signal, that contains a measured frequency component, c) determining whether the measured frequency component is within a predetermined distance from a trend line, which trend line is associated with only one specific frequency component of the electrical or mechanical parameter present during a specific undesired condition, d) on the condition that the measured frequency component is within the predetermined distance from the trend line increasing a counter associated with the trend line, e) repeating steps a) to d), wherein in case the counter reaches a predetermined number determining that the electrical drive system is subjected to the undesired condition associated with the trend line.

  • 29.
    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.

  • 30.
    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.

  • 31.
    Peretti, Luca
    et al.
    ABB Corporate Research.
    Svechkarenko, D.
    ABB Corporate Research.
    Self-commissioning procedure for inductance estimation in an electrical machine2011Patent (Other (popular science, discussion, etc.))
    Abstract [en]

    A method of estimating inductances and flux linkages of an electrical machine supplied with drive currents via current regulators. Drive current values are measured and fed back to the regulators for closed-loop control. The method includes providing one current regulator with an alternating current value either for a direct axis current reference i*d or for a quadrature axis current reference i*q of the machine current vector, while providing another current regulator with a predetermined direct current value for the remaining one of the two current references i*d and i*q. After a predetermined time, a varying signal is superimposed onto an output signal generated by the current regulator in response to the AC value. Finally, a contribution signal, which corresponds to the contribution of the superimposed varying signal to the drive currents, is determined, and the machine inductances and flux linkages are estimated on the basis of the contribution signal.

  • 32.
    Peretti, Luca
    et al.
    ABB Corporate Research, Sweden.
    Särkimäki, V.
    ABB Corporate Research.
    Mechanical drive train emulation by means of electrical drives - a generalised approach2012In: IECON 2012 - 38th Annual Conference on IEEE Industrial Electronics Society, Institute of Electrical and Electronics Engineers (IEEE), 2012, p. 1878-1883, article id 6388913Conference paper (Refereed)
    Abstract [en]

    The emulation of mechanical systems by means of electrical systems is an application of electrical machines and drives which have received increased attention in the recent years. As power electronics-controlled machines are dynamically faster than conventional mechanical systems, it is widely recognised that the behaviour of the latter can be emulated by a proper electrical machine torque control. Different test benches with different emulation capabilities have been proposed in the literature, but few attention has been posed to two aspects: the requirements of the drive emulator in terms of rated torque and/or power and/or bandwidth, and the emulation of effects like mechanical resonances within test benches with rigid mechanical connection. The paper tries to focus on these two aspects with both simulation and experimental results, in order to depict a general approach to the design of a drive emulator.

  • 33.
    Peretti, Luca
    et al.
    ABB Corporate Research, Sweden.
    Särkimäki, V.
    ABB Corporate Research.
    Fabér, J.
    University of Žilina.
    A wind turbine emulator for generator control algorithm development2013In: 2013 IEEE International Conference on Industrial Technology (ICIT), Institute of Electrical and Electronics Engineers (IEEE), 2013, p. 228-233, article id 6505677Conference paper (Refereed)
    Abstract [en]

    The paper describes an emulator for wind turbines which aims to be a base for the development of control algorithms for wind turbine generators. The emulator is physically composed by two servomotors in a back-to-back configuration, each of them controlled by a 4-kW power electronics converter. A FPGA-based control board is employed to model the effects of the wind, both in terms of turbulence and harmonics, and to emulate the mechanical characteristics of a wind turbine drive train. The models generate torque reference signals for the torque control of one of the two machines, which acts as a wind turbine. The second machine is used as a generator, controlled by the same FPGA-based board. The specific tasks of a wind turbine emulator are presented, describing in detail how they could be replicated on a small-scale test bench. The features of the actual emulator shown in the paper are discussed. Experimental results are presented, showing the benefits of a small-scale system for algorithm development.

  • 34.
    Peretti, Luca
    et al.
    ABB Corporate Research.
    Zanuso, G.
    ABB Corporate Research.
    Method and controller for controlling a synchronous machine2016Patent (Other (popular science, discussion, etc.))
  • 35.
    Peretti, Luca
    et al.
    University of Udine, Italy.
    Zigliotto, M.
    University of Udine, Italy.
    A force feedback system for steer-by-wire applications based on low-cost MR fluids - design hints2006In: 3rd IET International Conference on Power Electronics, Machines and Drives (PEMD 2006, 2006, p. 469-473Conference paper (Refereed)
    Abstract [en]

    In the automotive research scenario, the main purpose of a steer-by-wire system is the elimination of all mechanical connections between wheels and the steering wheel. The driver gets just a virtual and configurable feedback through the steering wheel, which becomes a stand-alone component. Among the emerging alternatives, magnetorheological (MR) fluids exhibit interesting properties that could well fit for safe and reliable force feedback systems. Through the collected data, this paper offers the essential information for the realisation of a force feedback device for steer-by-wire application. The paper includes the design and test of a pre-industrialised system, exploited for the measurements of low-cost, homemade MR.

  • 36.
    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.

  • 37.
    Peretti, Luca
    et al.
    University of Žilina.
    Zigliotto, M.
    University of Padova.
    Combined current/voltage model with inductance mismatch compensation for on-line estimation of flux linkages in permanent magnet and synchronous reluctance motor drives2012In: 6th IET International Conference on Power Electronics, Machines and Drives (PEMD 2012), 2012, p. 1-6Conference paper (Refereed)
    Abstract [en]

    A flux linkage estimator for synchronous machines which combines a voltage and a current model is analysed, based on an original scheme with some modifications. The proposed schemes assure convergence at steady-state and better transient performances. Simulation and experimental results were performed for different combinations of control schemes and flux linkage estimators, validating the discussed theory.

  • 38.
    Peretti, Luca
    et al.
    University of Padova, Italy.
    Zigliotto, M.
    University of Padova.
    FPGA-based voltage measurements in AC drives2010In: 19th International Conference on Electrical Machines, ICEM 2010, 2010, p. 1-6Conference paper (Refereed)
    Abstract [en]

    In the modern sensorless and self-commissioning drives scenario, the availability of precise phase voltage measurement represents an undoubted advantage. But the task is not trivial, and few viable solutions are available. The present paper proposes an up-to-date digital method for the measurement of the instantaneous phase voltages of a three-phase PWM inverter. The phase-to-phase PWM inverter voltages are oversampled with respect to the switching period by fast A/D converters, which feed the FPGA-based digital integrator. The digital output is ready for further uses in any advanced control and estimation algorithm. Measurement repeatability, reduced size, tuning-free circuit are among the inherent side-advantages of the FPGA-based solution with respect to the existing analog ones. The paper includes design hints and a full batch of experimental tests and validations.

  • 39.
    Peretti, Luca
    et al.
    University of Padova, Italy.
    Zigliotto, M.
    University of Padova.
    Identification of mechanical load for electrical drive commissioning - labelling machine case study2009In: IEEE EUROCON 2009, 2009, p. 810-816Conference paper (Refereed)
    Abstract [en]

    The paper presents a result of the system identification theory applied to an industrial machine. The case study was a labelling machine driven by a permanent magnet synchronous motor drive. The identified system model has been used to tune the closed-loop speed control of the drive. A brief recall of the basic principles of power spectral density applied to model identification, hints for the practical implementation and experimental results are included in the paper

  • 40.
    Peretti, Luca
    et al.
    University of Padova.
    Zigliotto, M.
    University of Padova.
    Procedimento per stimare i parametri del circuito equivalente di un motore asincrono, particolarmente in un azionamento vettoriale sensorless2011Patent (Other (popular science, discussion, etc.))
  • 41.
    Petrella, R.
    et al.
    University of Udine.
    Tursini, M.
    University of L'Aquila.
    Peretti, Luca
    University of Padova, Italy.
    Zigliotto, M.
    University of Padova.
    Speed measurement algorithms for low-resolution incremental encoder equipped drives: a comparative analysis2007In: 2007 International Aegean Conference on Electrical Machines and Power Electronics, 2007, p. 780-787Conference paper (Refereed)
    Abstract [en]

    Precise motion control requires high-accuracy and high-bandwidth feedback speed information, often calculated by direct measurement of the rotor position available through the incremental encoder equipping the drive. The resolution of the encoder heavily affects the cost of the drive and the accuracy and bandwidth of the calculated speed. The limitations introduced by a low resolution encoder can be partially reduced by a proper speed calculation (or estimation) algorithm, that therefore plays a key role in modern drive systems. In this paper a comparative analysis of state-of-art speed measurement and estimation algorithms suitable for low-resolution incremental encoder equipped drives is presented, aiming at highlighting the specific feature of each one, both from the performance point of view, and from the computational requirements needed for actual implementation. The paper proposes itself as a guide for engineers in the complex choice of the best solution for each application.

  • 42.
    Rogg, T.
    et al.
    Karlsruhe Institute of Technology.
    Peretti, Luca
    ABB Corporate Research.
    Method and system for estimating differential inductances in an electrical machine2015Patent (Other (popular science, discussion, etc.))
    Abstract [en]

    A self-commissioning method for estimating differential inductances in an electric machine, such as e.g. a synchronous reluctance machine or interior permanent magnet machine, with cross-magnetization effects is provided. The electric machine is driven with PWM voltages to explore current plurality of operating points of the currents in the electric machine while keeping the electric machine at standstill or quasi-standstill. At each operating point PWM switching voltage transients are used as a small-signal excitation. Currents of the electric machine are measured by means of oversampling, which permit the reconstruction of the waveforms including the current ripple within a PWM period caused by the PWM switching transients. Finally, the differential inductances at each operating point are determined based on the determined direct and quadrature current waveforms and voltages.

  • 43.
    Sakata, K.
    et al.
    University of Padova.
    Fujimoto, H.
    University of Padova.
    Peretti, Luca
    University of Padova.
    Zigliotto, M.
    University of Padova.
    Enhanced speed and current Control of PMSM drives by perfect tracking algorithms2010In: 2010 International Power Electronics Conference - ECCE Asia -, IPEC 2010, Institute of Electrical and Electronics Engineers (IEEE), 2010, p. 587-592, article id 5543320Conference paper (Refereed)
    Abstract [en]

    Speed and current closed loops control represent the heart of any advanced AC servo drive. These inner loops usually feature high-dynamic feedback control, with possible axes decoupling and a straight feedforward action of the back-electromotive force (back-EMF). More sophisticated techniques as single-rate or multi-rate control could be exploited for both speed and current closed loops, and their performances compared to that of the classic cascade feedback controllers. This represents the goal of the present work, focusing on permanent magnet synchronous motor (PMSM) drives.

  • 44.
    Sandulescu, Paul
    et al.
    ABB Oy, Finland.
    Zanuso, Giovanni
    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.
    Method and device for detecting the presence of a permanent magnet of a rotor of a synchronous machine2016Patent (Other (popular science, discussion, etc.))
    Abstract [en]

    A method of detecting a permanent magnet rotor of a synchronous machine, includes: injecting a voltage waveform to the stator windings of the synchronous machine, measuring two phase currents in the stator winding, transforming the two phase currents to a rotor reference frame to obtain a current waveform, sampling the current waveform to obtain positive and negative portion values, constructing first and second periodic waveforms by using the sampled positive and negative portion values, performing a frequency analysis of a first and second spectrums of the periodic waveforms, and determining whether a permanent magnet is present in the synchronous machine based on the spectrums.

  • 45.
    Tenca, P.
    et al.
    ABB Corporate Research.
    Peretti, Luca
    ABB Corporate Research.
    Carrier-less fault-tolerant stochastic synthesis in multi-cell multi-level converters: a central limit approach to highly-dimensional power electronic systems2016In: IET Power Electronics, ISSN 1755-4535, E-ISSN 1755-4543, Vol. 9, no 6, p. 1153-1162Article in journal (Refereed)
    Abstract [en]

    As the number of cells in multi-level converters increase, issues related to the high number of subsystems enter the power electronics area. Within this frame, this study presents a carrier-less approach to the voltage synthesis across the series of several voltage-source cells in multi-level converter topologies. The key idea is the exploitation of a stochastic-based choice of the discrete cell output voltage, operating according to a local, independent random variable. When the number of cells is sufficiently high, the law of large numbers and the central limit theorem (CLT) of the probability theory guarantee that the synthesis of the total voltage lies in a known interval with high probability. Because of the CLT stochastic properties, an increased number of cells inherently leads to more robust and faulttolerant waveforms, also due to the reduced capacitors required in each cell. The absence of deterministic modulation reduces the hardware cost (cabling and control) and requires no reconfiguration in case of cell failures. This work focuses on the theoretical and hardware-in-the-loop validation of the main principle, including an analysis of the capacitance requirements for each cell. The method could be also applied to current-source multi-level converters based on parallel connections of current-source cells.

  • 46.
    Tenca, P.
    et al.
    ABB Corporate Research.
    Peretti, Luca
    ABB Corporate Research.
    Fault tolerant cost-effective carrierless stochastic synthesis of voltages and currents in multi-Cell multilevel converters via the central limit theorem2013In: 2013 IEEE Energy Conversion Congress and Exposition, ECCE 2013, 2013, p. 1732-1739, article id 6646916Conference paper (Refereed)
    Abstract [en]

    The paper presents with experimental evidence a highly fault tolerant, cost-effective and carrierless solution to synthesize voltages (or currents) across the series (or parallel) connection of several voltage-source (or current-source) cells. Hundreds of voltage-source cells already characterize modern multilevel HVDC converters and structures based on current-source cells could become industrially meaningful too, if sufficient advancements in semiconductor and magnetic materials will occur. Exactly by relying on a large number of cells, the key approach is characterized by an unconventional absence of any determinism. The voltages (or currents) of all cells are generated as discrete independent random variables whose distribution is parameterized by the desired reference waveform to be synthesized. This is a radical difference from the already existing random PWM modulations, where only the switching instants are aleatory. The essence of the proposed method lies in observing that multilevel converters, which synthesize the desired waveforms through additive linear combinations (e.g. the simplest sum) of several elementary contributions, become naturally ruled by the Central Limit Theorem of the theory of probablity. Such a fundamental law of nature assures also that the greater the number of cells, the more the waveform synthesis becomes inherently robust, fault-tolerant and accurate. This property strikingly differs from those of deterministic centrally ruled modulations and it is also achieved with reduced hardware complexity and cost. The proposed method benefits from emerging technologies employing smaller mass-produced cells based on devices capable of improved switching characteristics, like SiC or GaN, thereby suiting design philosophies characterized by a high number of cost-optimized standard elementary units. Equally important, the proposed synthesis eliminates most physical communication channels (e.g. optical fibers) among the controller and the switches, thereby greatly improving the system reliability. The paper introduces also a hybrid variant of the method conceived for fewer cells.

  • 47.
    Tinazzi, F.
    et al.
    University of Padova.
    Sandulescu, P.
    ABB Corporate Research.
    Peretti, Luca
    ABB Corporate Research. Sweden.
    Zigliotto, M.
    University of Padova.
    On the true maximum efficiency operations of synchronous motor drives2017In: Proceedings of the International Conference on Power Electronics and Drive Systems, Institute of Electrical and Electronics Engineers (IEEE), 2017, Vol. 2017, p. 1043-1048Conference paper (Refereed)
    Abstract [en]

    Energy efficient AC drives for synchronous machines are key components in modern mechatronic systems, including applications of renewable energy and transportation. It is possible that the next generation of synchronous motors may be of the reluctance-prevalent type, due to the ecological footprint and cost of permanent magnet materials. When a reluctance torque is available, the torque is usually regulated according to the maximum torque per ampere principle which minimises the copper losses for a given torque request. However, iron and additional losses also contribute to the total machine losses, although their influence on the best current vector trajectory for total loss minimisation is not clear yet. The aim of this paper is to discuss and quantitatively evaluate the effect of iron and additional losses on the efficiency of different synchronous machines, looking for the true maximum efficiency. An extended batch of measurements performed on different types of machines with low power rating are discussed in detail.

  • 48.
    Vitturi, S.
    et al.
    University of Padova.
    Peretti, Luca
    University of Padova, Italy.
    Seno, L.
    Italian National Research Council.
    Zigliotto, M.
    University of Padova.
    Zunino, C.
    Italian National Research Council.
    Real-time Ethernet networks for motion control2011In: Computer Standards & Interfaces, ISSN 0920-5489, E-ISSN 1872-7018, Vol. 33, no 5, p. 465-476Article in journal (Refereed)
    Abstract [en]

    Communication networks have been traditionally employed in motion control applications, especially within factory automation systems. While in the past they were merely used to exchange non time critical data (e.g. parameters and configuration data) nowadays they allow for much more powerful performance. In particular, the recently introduced Real-time Ethernet (RTE) networks, have been explicitly designed in order to cope with very tight timing constraints in terms of both determinism and real-time. In this paper we focus on two popular RTE networks, namely Ethernet POWERLINK and EtherCAT, and provide an example of their employment for a coordinated motion control application. In particular, we consider the tracking of a circular trajectory by the coordinated motion of two independent axes where the velocity set-points are transmitted to the electrical drives implementing the axis control by means of the RTE networks. After providing some essential features of the two networks, we describe the configurations adopted for the coordinated motion control application. Then we check the effectiveness of the solution proposed by means of numerical simulations which take into consideration possible error scenarios deriving from the adoption of the communication networks such as transmission errors, communication delays and cable breaks.

  • 49.
    Zanuso, G.
    et al.
    ABB Corporate Research.
    Peretti, Luca
    ABB Corporate Research, Västerås.
    Sandulescu, P.
    ABB Corporate Research.
    Model-based synchronous machine control with compensation of model inaccuracies and instantaneous flux weakening capabilities2016In: Proceedings of the 8th IET International Conference on Power Electronics, Machines and Drives (PEMD), Institution of Engineering and Technology, 2016, Vol. 2016, p. 1-6Conference paper (Refereed)
    Abstract [en]

    This paper proposes a model-based current/torque control strategy for synchronous machines, where the magnetic model mismatches are compensated in real time and the flux weakening operation is obtained without the need of an external voltage regulation loop. Starting from an initial (and potentially wrong) knowledge of the non-linear current-to-flux linkage relation in the form of a look-up-table, a combination of feedforward actions, compensating mechanisms and binary searches are used to achieve the target during real-time operation. The algorithm is implemented in a laboratory test bench and successfully verified with experiments on an 11-kW synchronous reluctance machine, proving the feasibility of the proposed approach.

  • 50.
    Zanuso, G.
    et al.
    ABB Corporate Research.
    Peretti, Luca
    ABB Corporate Research.
    Sandulescu, P.
    ABB Corporate Research.
    Stator reference frame approach for DC injection-based stator resistance estimation in electric drives2015In: Proceedings of the 11th IEEE International Conference on Power Electronics and Drive Systems (PEDS), Institute of Electrical and Electronics Engineers (IEEE), 2015, p. 867-872, article id 7203391Conference paper (Refereed)
    Abstract [en]

    This work discusses an online stator resistance estimation method for synchronous machines. Multiple improvements are provided with respect to a similar method already been used for induction machines. The method is based on the temporary injection of a DC voltage in the machine phases during normal operation. The stator resistance estimation is obtained by means of the Ohm's law. The proposed scheme works entirely in the stator fixed reference frame, without the need of any machine parameter. The selection of the DC injection level is discussed, as well as the countermeasures for reducing the spurious harmonics appearing in the currents and the torque when the machine is speed- and current-regulated. In particular, minimum electric loss and minimum torque ripple due to the injection is achieved. Moreover, as an alternative to conventional low-pass filtering of the measured signals, it is shown that the resistance estimation can be obtained by averaging the signals over few electric periods. Experiments prove the validity of the proposed approach.

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