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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 drives2016Ingår i: IEEE transactions on industrial electronics (1982. Print), ISSN 0278-0046, E-ISSN 1557-9948, Vol. 63, nr 8, s. 5176-5185Artikel i tidskrift (Refereegranskat)
  • 2.
    Antonopoulos, Antonios
    et al.
    KTH, Skolan för elektro- och systemteknik (EES), Elektrisk energiomvandling.
    Ängquist, Lennart
    KTH, Skolan för elektro- och systemteknik (EES), Elektrisk energiomvandling.
    Harnefors, Lennart
    KTH, Skolan för elektro- och systemteknik (EES), Elektrisk energiomvandling. ABB, Sweden.
    Ilves, Kalle
    KTH, Skolan för elektro- och systemteknik (EES), Elektrisk energiomvandling.
    Nee, Hans-Peter
    KTH, Skolan för elektro- och systemteknik (EES), Elektrisk energiomvandling.
    Global Asymptotic Stability of Modular Multilevel Converters2014Ingår i: IEEE transactions on industrial electronics (1982. Print), ISSN 0278-0046, E-ISSN 1557-9948, Vol. 61, nr 2, s. 603-612Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Modular multilevel converters require that the controller is designed so that the submodule capacitor voltages are equalized and stable, independent of the loading conditions. Assuming that the individual capacitor-voltage sharing is managed effectively, an open-loop strategy has been designed to ensure that the total amount of energy stored inside the converter always will be controlled. This strategy, using the steady-state solutions of the dynamic equations for controlling the total stored energy in each converter arm, has proven to be effective. The intention of this paper is to explain in a rigorous way the mechanism behind the suggested strategy and to prove that, when this open-loop strategy is used, the system becomes globally asymptotically stable. Experimental verification on a three-phase 10-kVA prototype is presented.

  • 3.
    Bessman, Alexander
    et al.
    KTH, Skolan för kemivetenskap (CHE), Kemiteknik, Tillämpad elektrokemi.
    Soares, Rúdi
    KTH, Skolan för elektro- och systemteknik (EES), Elkraftteknik.
    Vadivelu, Sunilkumar
    KTH, Skolan för elektro- och systemteknik (EES), Elkraftteknik.
    Wallmark, Oskar
    KTH, Skolan för elektro- och systemteknik (EES), Elkraftteknik.
    Svens, Pontus
    KTH, Skolan för kemivetenskap (CHE), Kemiteknik, Tillämpad elektrokemi.
    Ekström, Henrik
    KTH, Skolan för kemivetenskap (CHE), Kemiteknik, Tillämpad elektrokemi.
    Lindbergh, Göran
    KTH, Skolan för kemivetenskap (CHE), Kemiteknik, Tillämpad elektrokemi.
    Challenging Sinusoidal Ripple-Current Charging of Lithium-Ion Batteries2018Ingår i: IEEE transactions on industrial electronics (1982. Print), ISSN 0278-0046, E-ISSN 1557-9948, Vol. 65, nr 6, s. 4750-4757Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Sinusoidal ripple-current charging has previously been reported to increase both charging efficiency and energy efficiency and decrease charging time when used to charge lithium-ion battery cells. In this paper, we show that no such effect exists in lithium-ion battery cells, based on an experimental study of large-size prismatic cells. Additionally, we use a physics-based model to show that no such effect should exist, based on the underlying electrochemical principles.

  • 4.
    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 drives2010Ingår i: IEEE transactions on industrial electronics (1982. Print), ISSN 0278-0046, E-ISSN 1557-9948, Vol. 57, nr 3, s. 986-993Artikel i tidskrift (Refereegranskat)
  • 5.
    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 drives2009Ingår i: IEEE transactions on industrial electronics (1982. Print), ISSN 0278-0046, E-ISSN 1557-9948, Vol. 56, nr 6, s. 1925-1936Artikel i tidskrift (Refereegranskat)
  • 6.
    Eriksson, Markus
    et al.
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Armendariz, Mikel
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Vasilenko, Oleg
    Ericsson Innovations Russia.
    Saleem, Arshad
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Nordström, Lars
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Multiagent-Based Distribution AutomationSolution for Self-Healing Grids2015Ingår i: IEEE transactions on industrial electronics (1982. Print), ISSN 0278-0046, E-ISSN 1557-9948, Vol. 62, nr 4, s. 2620-2628Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    A multiagent-based distribution automationsolution is proposed to be used in the distribution of selfhealinggrids to solve the service restoration part of theFault Location, Isolation and Service Restoration (FLISR)task. The solution reduces the grid topology to an undirectedweighted graph and executes a distributed implementationof Prim’s minimum spanning tree algorithm tosolve the problem. The solution is compliant with state-ofthe-art standards within smart grids, including but not limitedto IEC61850. To test the performance of the algorithm,a testbed is assembled consisting of a physical dc gridmodel and several Arduino microcontrollers and RaspberryPi computers. The test results show that the proposedalgorithm can handle complex FLISR scenarios.

  • 7.
    Gradin, Henrik
    et al.
    KTH, Skolan för elektro- och systemteknik (EES), Mikrosystemteknik.
    Braun, Stefan
    Stemme, Göran
    KTH, Skolan för elektro- och systemteknik (EES), Mikrosystemteknik.
    Wijngaart, Wouter van der
    KTH, Skolan för elektro- och systemteknik (EES), Mikrosystemteknik.
    SMA Microvalves for Very Large Gas Flow Control Manufactured Using Wafer-Level Eutectic Bonding2012Ingår i: IEEE transactions on industrial electronics (1982. Print), ISSN 0278-0046, E-ISSN 1557-9948, Vol. 59, nr 12, s. 4895-4906Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    This paper presents a novel gas microvalve design concept, in which a flow control gate is opened by a pneumatic pressure and closed by a shape memory alloy actuator, allowing large flow control. Two different design variations were fabricated using a novel wafer-level Au-Si eutectic bonding process for TiNi to silicon integration. The resulting microvalves demonstrate a record pneumatic performance per footprint area; a microvalve with a footprint of only 1 x 3.3 mm(2) successfully controls a flow difference of 3100 sccm at a pressure drop of 70 kPa using a power of 0.35 W.

  • 8. Green, A.
    et al.
    Severinson Eklundh, Kerstin.
    KTH, Tidigare Institutioner                               , Numerisk analys och datalogi, NADA.
    Designing for learnability in human-robot communication2003Ingår i: IEEE transactions on industrial electronics (1982. Print), ISSN 0278-0046, E-ISSN 1557-9948, Vol. 50, nr 4, s. 644-650Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    In a future scenario where many devices can be controlled using the voice, easy and intuitive access will be crucial for avoiding cognitive overload when users are faced with many different systems and interaction models. We propose a model for interaction with spoken language interfaces applied to heterogeneous tasks for service robots, based on the idea of using a family of lifelike characters,, We argue that we can signal important features of the speech interface by using certain visual cues. The aim is to facilitate learning and transfer between interfaces. We discuss challenges for dialogue design affecting learnability in the light of the speech interface constructed for our full-scale robot prototype CERO.

  • 9.
    Harnefors, Lennart
    et al.
    KTH, Skolan för elektro- och systemteknik (EES), Elektrisk energiomvandling.
    Antonopoulos, Antonios
    KTH, Skolan för elektro- och systemteknik (EES), Elektrisk energiomvandling.
    Norrga, Staffan
    KTH, Skolan för elektro- och systemteknik (EES), Elektrisk energiomvandling.
    Ängquist, Lennart
    KTH, Skolan för elektro- och systemteknik (EES), Elektrisk energiomvandling.
    Nee, Hans-Peter
    KTH, Skolan för elektro- och systemteknik (EES), Elektrisk energiomvandling.
    Dynamic Analysis of Modular Multilevel Converters2013Ingår i: IEEE transactions on industrial electronics (1982. Print), ISSN 0278-0046, E-ISSN 1557-9948, Vol. 60, nr 7, s. 2526-2537Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Theory for the dynamics of modular multilevel converters is developed in this paper. It is shown that the sum capacitor voltage in each arm often can be considered instead of the individual capacitor voltages, thereby significantly reducing the complexity of the system model. Two selections of the so-called insertion indices, which both compensate for the sum-capacitor-voltage ripples, are considered. The dynamic systems which respectively result from these selections are analyzed. An effective dc-bus model, which takes into account the contribution from the submodule capacitors, is obtained. Finally, explicit formulas for the stationary sum-capacitor-voltage ripples are derived.

  • 10. Harnefors, Lennart
    et al.
    Jansson, Magnus
    Ottersten, Rolf
    Pietiläinen, Kai
    Unified Sensorless Vector Control of Synchronous and Induction Motors2003Ingår i: IEEE transactions on industrial electronics (1982. Print), ISSN 0278-0046, E-ISSN 1557-9948, IEEE transactions on industrial electronics, Vol. 50, nr 1, s. 153-160Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    In this paper, a unified theory for sensorless fluxestimation and vector control of induction motors and nonsalientpermanent-magnet synchronous motors (PMSMs) is developed.It is shown that an estimator and vector controller for one of themotor types can also be applied to the other, with only minormodifications necessary. Two candidate estimators are considered:a variant of the well-known “voltage model” (VM) and aphase-locked-loop-type speed and position estimator. These areapplied to both motor types, and evaluated experimentally. Forthe nonsalient PMSM, an important result is that synchronizationcan be guaranteed from any initial rotor position.

  • 11.
    Harnefors, Lennart
    et al.
    KTH, Skolan för elektro- och systemteknik (EES), Elektrisk energiomvandling.
    Nee, Hans-Peter
    KTH, Skolan för elektro- och systemteknik (EES), Elektrisk energiomvandling.
    A general algorithm for speed and position estimation of AC motors2000Ingår i: IEEE transactions on industrial electronics (1982. Print), ISSN 0278-0046, E-ISSN 1557-9948, Vol. 47, nr 1, s. 77-83Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    A computationally efficient speed and position estimation algorithm, generally applicable to AC motor drives, is designed and analyzed. Applications include: (a) sensorless permanent-magnet and reluctance synchronous motor drives using the fundamental excitation as information source; (b) sensorless drives using saliency and signal injection; and (c) sensored drives using resolvers. Particular attention is given for case (a). Low parameter sensitivity in the entire speed range (except at low speeds for the reluctance motor)-implying a small position estimation error-and good dynamic properties at nominal speeds are verified.

  • 12. Harnefors, Lennart
    et al.
    Pietiläinen, Kai
    Gertmar, Lars
    Torque-Maximizing Field-Weakening Control: Design, Analysis, and Parameter Selection2001Ingår i: IEEE transactions on industrial electronics (1982. Print), ISSN 0278-0046, E-ISSN 1557-9948, Vol. 48, nr 1, s. 161-168Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    The torque-maximizing field-weakening controlscheme proposed by Kim and Sul is developed further. Theperformance under imperfect field orientation conditions isinvestigated, and it is shown that an overestimated—rather thanan underestimated—model leakage inductance should be used. Aslightly modified algorithm, which offers better robustness andreduced computational complexity, is presented. The importance,for good performance, of combining the scheme with currentand speed controllers featuring antiwindup and improved disturbancerejection is emphasized. The dynamics of the resultingclosed-loop system are analyzed. Obtained in the process are rulesfor selection of all controller parameters, allowing tuning withouttrial-and-error steps. Good performance of the resulting systemis verified experimentally.

  • 13.
    Harnefors, Lennart
    et al.
    KTH, Skolan för elektro- och systemteknik (EES), Elektriska energisystem. ABB Corporate Research, Västerås, Sweden .
    Yepes, Alejandro G.
    Vidal, Ana
    Doval-Gandoy, Jesus
    Passivity-Based Controller Design of Grid-Connected VSCs for Prevention of Electrical Resonance Instability2015Ingår i: IEEE transactions on industrial electronics (1982. Print), ISSN 0278-0046, E-ISSN 1557-9948, Vol. 62, nr 2, s. 702-710Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    The time delay in the current control loop of a grid-connected voltage-source converter (VSC) may cause destabilization of electrical resonances in the grid or in the VSC's input filter. Instability is prevented if the input admittance of the VSC can be made passive. This paper presents an analytical controller design method for obtaining passivity. The method is equally applicable to single-and three-phase systems, i.e., in the latter case, for both stationary-and synchronous-frame control. Simulations and experiments verify the theoretical results.

  • 14. Jansson, Magnus
    et al.
    Harnefors, L.
    Wallmark, Oskar
    Leksell, Mats
    KTH, Skolan för elektro- och systemteknik (EES), Elektriska maskiner och effektelektronik.
    Synchronization at startup and stable rotation reversal of sensorless nonsalient PMSM drives2006Ingår i: IEEE transactions on industrial electronics (1982. Print), ISSN 0278-0046, E-ISSN 1557-9948, Vol. 53, nr 2, s. 379-387Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    In this paper, a variant of the well-known voltage model is applied to rotor position estimation for sensorless control of nonsalient permanent-magnet synchronous motors (PMSMs). Particular focus is on a low-speed operation. It is shown that a guaranteed synchronization from any initial rotor position and stable reversal of rotation can be accomplished, in both cases under load. Stable rotation reversal is accomplished by making the estimator insensitive to the stator resistance. It is also shown that the closed-loop speed dynamics are similar to those of a sensored drive for speeds above approximately 0.1 per unit, provided that the model stator inductance is underestimated. Experimental results support the theory.

  • 15.
    Jin, Lebing
    et al.
    KTH, Skolan för elektro- och systemteknik (EES), Elkraftteknik.
    Norrga, Staffan
    KTH, Skolan för elektro- och systemteknik (EES), Elkraftteknik.
    Wallmark, Oskar
    KTH, Skolan för teknikvetenskap (SCI), Farkost och flyg.
    Apostolopoulos, Nikolaos
    Communication-Based Distributed Control of the Stacked Polyphase Bridges Converter2018Ingår i: IEEE transactions on industrial electronics (1982. Print), ISSN 0278-0046, E-ISSN 1557-9948, Vol. 65, nr 2, s. 1011-1020Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    The stacked polyphase bridges converter has gained increasing interest in recent years due to its modular design and easy adaption to different power levels. The real-time control and dynamic data transmission of a stacked polyphase bridges converter consisting of a number of submodules are challenging tasks. For the reason that the distributed control architecture can maintain the benefit of modularity, such an approach dedicated for the stacked polyphase bridges converter is presented in this paper. Suitable communication techniques and synchronization techniques for the presented architecture are discussed. In addition, based on a dynamic model of the converter, the sensitiveness of the distributed control system to communication bandwidth and delay is studied on an experimental prototype.

  • 16.
    Jin, Lebing
    et al.
    KTH, Skolan för elektro- och systemteknik (EES), Elkraftteknik.
    Staffan, Norrga
    KTH, Skolan för elektro- och systemteknik (EES), Elkraftteknik.
    Wallmark, Oskar
    KTH, Skolan för elektro- och systemteknik (EES), Elkraftteknik.
    Communication-based distributed control of the stacked polyphase bridges converterIngår i: IEEE transactions on industrial electronics (1982. Print), ISSN 0278-0046, E-ISSN 1557-9948Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    The stacked polyphase bridges (SPB) converter has gained increasing interest in recent years due to its modular design and easy adaption to different power levels. The realtime control and dynamic data transmission of an SPB converter consisting of a number of submodules are challenging tasks. For the reason that the distributed control architecture can maintain the benefit of modularity, such an approach, dedicated for the SPB converter is presented in this paper. Suitable communication techniques and synchronization techniques for the presented architecture are discussed. In addition, based on a dynamic model of the converter, the sensitiveness of the distributed control system to communication bandwidth and delay is studied on an experimental prototype.

  • 17. Liu, Kun
    et al.
    Fridman, Emilia
    Johansson, Karl H.
    KTH, Skolan för elektro- och systemteknik (EES), Reglerteknik.
    Xia, Yuanqing
    Quantized Control Under Round-Robin Communication Protocol2016Ingår i: IEEE transactions on industrial electronics (1982. Print), ISSN 0278-0046, E-ISSN 1557-9948, Vol. 63, nr 7, s. 4461-4471Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    This paper analyzes the exponential stability of a discrete-time linear plant in feedback control over a communication network with N sensor nodes, dynamic quantization, large communication delays, variable sampling intervals, and round-robin scheduling. The closedloop system is modeled as a switched system with multiple-ordered time-varying delays and bounded disturbances. We propose a time-triggered zooming algorithm implemented at the sensors that preserves exponential stability of the closed-loop system. A direct Lyapunov approach is presented for initialization of the zoom variable. The proposed framework can be applied to the plants with polytopic type uncertainties. The effectiveness of the method is illustrated on cart-pendulum and quadruple-tank processes.

  • 18.
    Massmoudi, N.
    et al.
    LEII, Département de Génie Electrique, École Nationale d'Ingenieurs de Sfax.
    M'baïri, Felix D.
    LEII, Département de Génie Electrique, École Nationale d'Ingenieurs de Sfax.
    Allard, B.
    CEGELY CNRS UPRESA 5005, INSA de Lyon.
    Morel, H.
    CEGELY CNRS UPRESA 5005, INSA de Lyon.
    On the validity of the standard SPICE model of the diode for the simulation in power electronics2001Ingår i: IEEE transactions on industrial electronics (1982. Print), ISSN 0278-0046, E-ISSN 1557-9948, Vol. 48, nr 4, s. 864-867Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    A systematic study of the standard SPICE model of the diode in the case of simulations of power diodes in power electronic applications shows the limits of accuracy with respect to experiments. Therefore, the interest in such a model in power electronic applications is comparable to the high-low resistance model.

  • 19.
    Millinger, Jonas
    et al.
    KTH, Skolan för elektroteknik och datavetenskap (EECS), Elkraftteknik. Atlas Copco Industrial Technique AB.
    Bacco, Giacomo
    Manzolini, Virginia
    Wallmark, Oskar
    KTH, Skolan för elektroteknik och datavetenskap (EECS), Elkraftteknik. KTH, Skolan för teknikvetenskap (SCI), Farkost och flyg.
    Bianchi, Nicola
    Design and Evaluation of a Short-Circuit Rotor-Ring for Enhanced Self-Sensing Capability in a Slotless PM Motor2019Ingår i: IEEE transactions on industrial electronics (1982. Print), ISSN 0278-0046, E-ISSN 1557-9948Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    This paper deals with the design and evaluation of a short-circuit rotor-ring for enhanced self-sensing capability in a 2-pole slotless permanent-magnet motor. High-frequency rotor anisotropy is enabled by adding as hort-circuited rotor-ring. Optimal ring-dimensions are determined by parametric numerical studies. An effective high-frequency saliency of up to 1.8 is demonstrated. The steady-state estimation error is within ±2◦, practically unaffected by current level (in contrast to slotted self-sensing electrical machinery) due to the large effective air-gap. The proposed observer performs properly also during dynamic load changes. Fall-times from 3000 to 0 rpm in less than 50 ms with negligible overshoot are demonstrated. Also parasitic effects such as power losses, heating and torque ripple are analyzed.

  • 20.
    Millinger, Jonas
    et al.
    KTH, Skolan för elektroteknik och datavetenskap (EECS), Elkraftteknik.
    Wallmark, Oskar
    KTH, Skolan för elektroteknik och datavetenskap (EECS), Elkraftteknik. KTH, Skolan för teknikvetenskap (SCI), Farkost och flyg.
    Soulard, Juliette
    Warwick University.
    Investigation of Harmonic Losses in a 2-PoleSlotless Permanent-Magnet Motor due to WideBand-Gap Inverter Supply2019Ingår i: IEEE transactions on industrial electronics (1982. Print), ISSN 0278-0046, E-ISSN 1557-9948Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    The recent emerge of wide band-gap powerdevices enables higher switching frequencies in electric motor drives. The subsequent possibility for higher efficiencyand smaller size requires accurate prediction of harmonic losses in motors. Therefore this paper presents an original analysis of harmonic losses arising in inverter-fed 2-pole slotless permanent-magnet machines with axially segmented ring magnets. The developed three-dimensional time-efficient numerical model is successfully validated under high-speed no-load operation using a silicon-carbide based three-phase inverter and rotors carrying a broad range of magnet segment thicknesses (3–12.6 mm). The model enables harmonic loss prediction capability (including loss separation) with an accuracy of 15 % over a wide frequency range (8–120 kHz), which is a unique contribution. The sensitivity analysis primarily emphasizes the importance of taking into account the axial segmentation, and secondarily the rotor-shaft magneto-elasticity effects for accurate modeling of harmonic losses. The conducted case-study demonstrates that wide band-gap transistors effectively can contribute to eliminating the need for inductive filters in motor drives.

  • 21.
    Modeer, Tomas
    et al.
    KTH, Skolan för elektro- och systemteknik (EES), Elektrisk energiomvandling.
    Norrga, Staffan
    KTH, Skolan för elektro- och systemteknik (EES), Elektrisk energiomvandling.
    Nee, Hans-Peter
    KTH, Skolan för elektro- och systemteknik (EES), Elektrisk energiomvandling.
    High-Voltage Tapped-Inductor Buck Converter Utilizing an Autonomous High-Side Switch2015Ingår i: IEEE transactions on industrial electronics (1982. Print), ISSN 0278-0046, E-ISSN 1557-9948, Vol. 62, nr 5, s. 2868-2878Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    A high-voltage tapped-inductor buck converter utilizing a novel autonomous high-voltage valve is presented in this paper. Its application as auxiliary power supply for high-power cascaded-converter submodules is discussed, followed by a presentation of the most challenging problems in designing a low-power high-voltage step-down converter. The TI-buck converter topology is analyzed, which together with the novel autonomous high-voltage valve overcomes most of the problems. Analytical expressions describing the operation as well as circuit simulations are presented. Finally, an experimental evaluation of a 3-kV 70-W prototype converter utilizing the proposed autonomous high-voltage valve with series-connected super-junction MOSFETs is presented.

  • 22.
    Moghaddam, Reza Rajabi
    et al.
    KTH, Skolan för elektro- och systemteknik (EES), Elektriska maskiner och effektelektronik.
    Magnussen, Freddy
    Sadarangani, Chandur
    KTH, Skolan för elektro- och systemteknik (EES), Elektriska maskiner och effektelektronik.
    Theoretical and Experimental Reevaluation of Synchronous Reluctance Machine2010Ingår i: IEEE transactions on industrial electronics (1982. Print), ISSN 0278-0046, E-ISSN 1557-9948, Vol. 57, nr 1, s. 6-13Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    This paper theoretically introduces and develops a new operation diagram (OPD) and parameter estimator for the synchronous reluctance machine (SynRM). The OPD demonstrates the behavior of the machine's main performance parameters, such as torque, current, voltage, frequency, flux, power factor (PF), and current angle, all in one graph. This diagram can easily be used to describe different control strategies, possible operating conditions, both below- and above-rated speeds, etc. The saturation effect is also discussed with this diagram by finite-element-method calculations. A prototype high-performance SynRM is designed for experimental studies, and then, both machines' [corresponding induction machine (IM)] performances at similar loading and operation conditions are tested, measured, and compared to demonstrate the potential of SynRM. The laboratory measurements (on a standard 15-kW Eff1 IM and its counterpart SynRM) show that SynRM has higher efficiency, torque density, and inverter rating and lower rotor temperature and PF in comparison to IM at the same winding-temperature-rise condition. The measurements show that the torque capability of SynRM closely follows that of IM.

  • 23. Mosskull, Henrik
    et al.
    Galic, Johann
    Wahlberg, Bo
    KTH, Skolan för elektro- och systemteknik (EES), Centra, ACCESS Linnaeus Centre. KTH, Skolan för elektro- och systemteknik (EES), Reglerteknik.
    Stabilization of induction motor drives with poorly damped input filters2007Ingår i: IEEE transactions on industrial electronics (1982. Print), ISSN 0278-0046, E-ISSN 1557-9948, Vol. 54, nr 5, s. 2724-2734Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Efficient torque control of induction motor drives in combination with resonant dc-link input filters can lead to a type of stability problem that is known as negative impedance instability. An often-proposed solution to this problem is the nonlinear system stabilizing controller (NSSC). Stability is usually analyzed under the simplifying assumption of perfect torque control. This indicates that the NSSC stabilizes the drive at any operating point. In this paper, however, we show power laboratory experiments where the NSSC stabilization fails. An improved framework for stability analysis and synthesis of stabilization, based on a linear. feedback model of the drive, is therefore proposed. With this approach, effects of time delays can easily be included, and stability margins can be directly established from measurements. To solve the indicated problems with NSSC, a stabilization controller that considers the practical limitations of torque control is derived. In the design of the stabilization controller, the tradeoff between damping and acceptable torque control is also explicitly taken into account. The proposed stabilization scheme is implemented and evaluated on a hardware-in-the-loop simulator as well as in a power laboratory. The results show that the proposed method outperforms the NSSC method.

  • 24.
    Nategh, Shafigh
    et al.
    KTH, Skolan för elektro- och systemteknik (EES), Elektrisk energiomvandling.
    Krings, Andreas
    KTH, Skolan för elektro- och systemteknik (EES), Elektrisk energiomvandling.
    Wallmark, Oskar
    KTH, Skolan för elektro- och systemteknik (EES), Elektrisk energiomvandling.
    Leksell, Mats
    KTH, Skolan för elektro- och systemteknik (EES), Elektrisk energiomvandling.
    Evaluation of Impregnation Materials for Thermal Management of Liquid-Cooled Electric Machines2014Ingår i: IEEE transactions on industrial electronics (1982. Print), ISSN 0278-0046, E-ISSN 1557-9948, Vol. 61, nr 11, s. 5956-5965Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    In this paper, the thermal impact of using different impregnation materials on high-performance liquid-cooled electric machines is studied. In this regard, varnish, Epoxylite, and a silicone-based thermally conductive material are considered. To study thermal effects of using different impregnation materials in theory, an advanced lumped-parameter thermal model of the studied electric machines is developed. In addition to the simulation studies, three identical induction machines using the aforementioned materials are manufactured and evaluated. Experimental tests are carried out at a wide range of current magnitudes and cooling conditions. A good agreement between the temperature measurements and corresponding simulation results is observed. It is demonstrated that using innovative thermally conductive materials in the stator slots and the end winding bodies of liquid-cooled electric machines results in a significant reduction in the winding hot spot temperature. Additionally, the influence of the critical parameters on the impregnation material performance, e. g., impregnation goodness and slot fill factor, is studied.

  • 25. Nategh, Shafigh
    et al.
    Zhang, Hui
    KTH, Skolan för elektroteknik och datavetenskap (EECS), Elkraftteknik.
    Wallmark, Oskar
    KTH, Skolan för elektroteknik och datavetenskap (EECS), Elkraftteknik.
    Aldo, Boglietti
    Nassen, Tobias
    Bombardier Transportat, SE-72214 Vasteras, Sweden.
    Bazant, Martin
    Bombardier Transportat, CH-8050 Zurich, Switzerland.
    Transient thermal modeling and analysis of railway traction motors2018Ingår i: IEEE transactions on industrial electronics (1982. Print), ISSN 0278-0046, E-ISSN 1557-9948, Vol. 66, nr 1, s. 79-89, artikel-id 8328892Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    This paper presents a practical approach to modeland analyze transient thermal effects in open air-cooled electrictraction motors. The developed thermal modeling method enablesaccurate estimation of temperature in critical parts of the motorincluding winding and bearing. Advantages of both numericaland analytical modelling methods are exploited with the aim ofrealizing accurate estimation of hot spot temperatures in tractionmotors while keeping the computation time within a reasonablerange. Computational fluid dynamics (CFD) simulations arecarried out to model the cooling fan’s performance and airflow distribution in the motor in order to provide heat transferboundary inputs to the developed combined finite element (FE)and lumped parameter (LP) thermal model. The combinationof the FE and LP models keeps the size of the model relativelysmall and enables running transient calculations reasonably fast.Also, the developed model provides the possibility to studythe influence of stator and rotor duct blockages on the motorthermal performance which is a common root of failure intraction applications during operation in dirty environments. Theproposed thermal model is verified using experimental results ona traction motor equipped with temperature sensors in motorcritical parts and a good agreement between estimated andmeasured temperatures is achieved. Finally, a calibrated fullyanalytical model using the abovementioned developed model isimplemented to further reduce simulation running time andcalculate motor temperature under normal running condition.

  • 26.
    Onori, Mauro
    et al.
    KTH, Skolan för industriell teknik och management (ITM), Industriell produktion.
    Barata da Oliveira, Jose
    UNINOVA.
    Evolvable Production Systems: New domains within mechatronic production equipment2010Ingår i: IEEE transactions on industrial electronics (1982. Print), ISSN 0278-0046, E-ISSN 1557-9948, s. 2653-2657Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Current major roadmapping efforts have all clearly underlined that true industrial sustainability will require far higher levels of systems’ autonomy and adaptability. In accordance with these recommendations, the Evolvable Production Systems (EPS) has aimed at developing such technological solutions and support mechanisms. Since its inception in 2002 as a next generation of production systems, the concept is being further developed and tested to emerge as a production system paradigm. Characteristically, Evolvable systems have distributed control, and are composed of intelligent modules with embedded control. A concerted effort is being exerted through European research projects in collaboration with manufacturers, technology/equipment suppliers, and universities. After introducing EPS, this paper presents current developments and applications, with specific emphasis on principles and mechatronic applications.

  • 27. Park, Pangun
    et al.
    Di Marco, Piergiuseppe
    KTH, Skolan för elektro- och systemteknik (EES), Centra, ACCESS Linnaeus Centre.
    Johansson, Karl H.
    KTH, Skolan för elektro- och systemteknik (EES), Centra, ACCESS Linnaeus Centre. KTH, Skolan för elektro- och systemteknik (EES), Reglerteknik.
    Cross-Layer Optimization for Industrial Control Applications Using Wireless Sensor and Actuator Mesh Networks2017Ingår i: IEEE transactions on industrial electronics (1982. Print), ISSN 0278-0046, E-ISSN 1557-9948, Vol. 64, nr 4, s. 3250-3259Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    When multiple control processes share a common wireless network, the communication protocol must provide reliable performance in order to yield stability of the overall system. In this paper, the novel cross-layer optimized control (CLOC) protocol is proposed for minimizing the worst case performance loss of multiple industrial control systems. CLOC is designed for a general wireless sensor and actuator network where both sensor to controller and controller to actuator connections are over a multihop mesh network. The design approach relies on a constrained max-min optimization problem, where the objective is to maximize the minimum resource redundancy of the network and the constraints are the stability of the closed-loop control systems and the schedulability of the communication resources. The optimal operation point of the protocol is automatically set in terms of the sampling rate, scheduling, and routing, and is achieved by solving a linear programming problem, which adapts to system requirements and link conditions. The protocol has been experimentally implemented and evaluated on a testbed with off-the-shelf wireless sensor nodes, and it has been compared with a traditional network design and a fixed-schedule approach. Experimental results show that CLOC indeed ensures control application stability and fulfills communication constraints while maximizing the worst case redundancy gain of the system performance.

  • 28. Pietiläinen, Kai
    et al.
    Harnefors, Lennart
    Petersson, Andreas
    Nee, Hans-Peter
    KTH, Skolan för elektro- och systemteknik (EES).
    DC-Link Stabilization and Voltage Sag Ride-Through of Inverter Drives2006Ingår i: IEEE transactions on industrial electronics (1982. Print), ISSN 0278-0046, E-ISSN 1557-9948, Vol. 53, nr 4, s. 1261-1268Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Previous results concerning instability of the dc linkin inverter drives fed from a dc grid or via a rectifier are extended.It is shown that rectifier–inverter drives equipped with small (film)dc-link capacitors may need active stabilization. The impact oflimited bandwidth and switching frequency in the inverter–motorcurrent control loop is considered, and recommendations forselection of the dc-link capacitor, the switching frequency, andthe dc-link stabilization control law in relation to each other aregiven. This control law is incorporated in a field-weakening (toenhance voltage sag ride-through) current controller for whichdesign recommendations are presented.

  • 29.
    Sadik, Diane-Perle
    et al.
    KTH, Skolan för elektro- och systemteknik (EES), Elektrisk energiomvandling.
    Colmenares, Juan
    KTH, Skolan för elektro- och systemteknik (EES), Elektrisk energiomvandling.
    Tolstoy, Georg
    KTH, Skolan för elektro- och systemteknik (EES), Elektrisk energiomvandling.
    Peftitsis, Dimosthenis
    KTH, Skolan för elektro- och systemteknik (EES), Elektrisk energiomvandling.
    Bakowski, Mietek
    Rabkowski, Jacek
    KTH, Skolan för elektro- och systemteknik (EES), Elektrisk energiomvandling.
    Nee, Hans-Peter
    KTH, Skolan för elektro- och systemteknik (EES), Elektrisk energiomvandling.
    Short-Circuit Protection Circuits for Silicon Carbide Power Transistors2016Ingår i: IEEE transactions on industrial electronics (1982. Print), ISSN 0278-0046, E-ISSN 1557-9948, ISSN 0278-0046, Vol. 63, nr 4, s. 1995-2004, artikel-id ITIEDArtikel i tidskrift (Refereegranskat)
    Abstract [en]

    An experimental analysis of the behavior under short-circuit conditions of three different siliconcarbide (SiC) 1200-V power devices is presented. It is found that all devices take up a substantial voltage, which is favorable for detection of short circuits. A transient thermal device simulation was performed to determine the temperature stress on the die during a short-circuit event, for the SiC MOSFET. It was found that, for reliability reasons, the short-circuit time should be limited to values well below Si IGBT tolerances. Guidelines toward a rugged design for short-circuit protection (SCP) are presented with an emphasis on improving the reliability and availability of the overall system. A SiC device driver with an integrated SCP is presented for each device-type, respectively, where a shortcircuit detection is added to a conventional driver design in a simple way. The SCP driver was experimentally evaluated with a detection time of 180 ns. For all devices, short-circuit times well below 1 µs were achieved.

  • 30. Wallmark, Oskar
    et al.
    Harnefors, L.
    Carlson, O.
    An improved speed and position estimator for salient permanent-magnet synchronous motors2005Ingår i: IEEE transactions on industrial electronics (1982. Print), ISSN 0278-0046, E-ISSN 1557-9948, Vol. 52, nr 1, s. 255-262Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    In this paper, an improved phase-locked-loop-type speed and position estimator for permanent-magnet synchronous motor (PMSM) drives is considered. Particular attention is put on salient-rotor PMSMs with fast mechanical dynamics. A method is presented, whereby significantly improved tracking is achieved. While saliency makes nominal-speed stability more difficult to guarantee (an analysis of this is presented), a benefit is that signal-injection methods can be used at low speeds for accurate position estimation, which is also included in the modified estimator.

  • 31. Wallmark, Oskar
    et al.
    Harnefors, Lennart
    Sensorless control of salient PMSM drives in the transition region2006Ingår i: IEEE transactions on industrial electronics (1982. Print), ISSN 0278-0046, E-ISSN 1557-9948, Vol. 53, nr 4, s. 1179-1187Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    This paper considers speed and position estimation of salient permanent-magnet synchronous machines (PMSMs). An estimator of phase-locked loop (PLL) type is considered. Signal injection techniques are used in the zero-speed and low-speed regions, while information found in the back electromotive force (EMF) is used for higher speeds. Particular focus is put on the transition region, i.e., the speed region where the estimator switches between signal-injection and back-EMF-based methods. It is shown that the estimator may become unstable for certain setups of machine parameters and operating conditions if the transition region is determined incorrectly. To avoid this instability, design rules for how the transition region should be determined, as well as recommended selections for all parameters introduced, are given. The results of the analysis are also supported with experimental results.

  • 32.
    Wallmark, Oskar
    et al.
    KTH, Skolan för elektro- och systemteknik (EES), Elektriska maskiner och effektelektronik.
    Harnefors, Lennart
    Carlson, Ola
    Control algorithms for a fault-tolerant PMSM drive2007Ingår i: IEEE transactions on industrial electronics (1982. Print), ISSN 0278-0046, E-ISSN 1557-9948, Vol. 54, nr 4, s. 1973-1980Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    This paper proposes control algorithms for a fault-tolerant permanent-magnet synchronous motor (PMSM) drive. In order to improve the reliability of the drive, an algorithm for achieving a sensorless control that operates properly also in fault mode is proposed. Furthermore, it is shown how a closed-loop field-weakening controller needs to be modified in order to operate properly in fault mode. Automotive applications are in mind and the algorithms presented are verified with experimental results using an in-wheel PMSM. With the proposed modifications, the reliability of the drive can be improved.

  • 33.
    Wang, Jian
    et al.
    Univ Elect Sci & Technol China, Chengdu 611731, Sichuan, Peoples R China..
    Guo, Shize
    Univ Elect Sci & Technol China, Chengdu 611731, Sichuan, Peoples R China..
    Chen, Zhe
    Univ Elect Sci & Technol China, Chengdu 611731, Sichuan, Peoples R China..
    Li, Yubai
    Univ Elect Sci & Technol China, Chengdu 611731, Sichuan, Peoples R China..
    Lu, Zhonghai
    KTH, Skolan för elektroteknik och datavetenskap (EECS), Elektronik, Elektronik och inbyggda system.
    A New Parallel CODEC Technique for CDMA NoCs2018Ingår i: IEEE transactions on industrial electronics (1982. Print), ISSN 0278-0046, E-ISSN 1557-9948, Vol. 65, nr 8, s. 6527-6537Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Code division multiple access (CDMA) network-on-chip (NoC) has been proposed for many-core systems due to its data transfer parallelism over communication channels. Consequently, coder-decoder (CODEC) module, which greatly impacts the performance of CDMA NoCs, attracted growing attention in recent years. In this paper, we propose a new parallel CODEC technique for CDMA NoCs. In general, by using a few simple logic circuits with small penalties in area and power, our new parallel (NPC) CODEC can execute the encoding/decoding process in parallel and thus reduce the data transfer latency. To reveal the benefits of our method for on-chip communication, we apply our NPC to CDMA NoCs and perform extensive experiments. From the results, we can find that our method outperforms existing parallel CODECs, such as Walsh-based parallel CODEC (WPC) and overloaded parallel CODEC (OPC). Specifically, it improves the critical point of communication latency (7.3% over WPC and 13.5% over OPC), reduces packet latency jitter by about 17.3% (against WPC) and 71.6% (against OPC), and improves energy efficiency by up to 41.2% (against WPC) and 59.2% (against OPC).

  • 34. Yang, Tao
    et al.
    Lu, Jie
    Wu, Di
    Wu, Junfeng
    KTH, Skolan för elektro- och systemteknik (EES), Reglerteknik. KTH, Skolan för elektro- och systemteknik (EES), Centra, ACCESS Linnaeus Centre.
    Shi, Guodong
    Meng, Ziyang
    Johansson, Karl Henrik
    KTH, Skolan för elektro- och systemteknik (EES), Reglerteknik. KTH, Skolan för elektro- och systemteknik (EES), Centra, ACCESS Linnaeus Centre.
    A Distributed Algorithm for Economic Dispatch Over Time-Varying Directed Networks With Delays2017Ingår i: IEEE transactions on industrial electronics (1982. Print), ISSN 0278-0046, E-ISSN 1557-9948, Vol. 64, nr 6, s. 5095-5106Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    In power system operation, the economic dispatch problem (EDP) aims to minimize the total generation cost while meeting the demand and satisfying generator capacity limits. This paper proposes an algorithm based on the gradient push-sum method to solve the EDP in a distributed manner over communication networks potentially with time-varying topologies and communication delays. This paper shows that the proposed algorithm is guaranteed to solve the EDP if the time-varying directed communication network is uniformly jointly strongly connected. Moreover, the proposed algorithm is also able to handle arbitrarily large but bounded time-varying delays on communication links. Numerical simulations are used to illustrate and validate the proposed algorithm.

  • 35.
    Zhang, Zhi
    et al.
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Elektroniksystem. KTH, Skolan för informations- och kommunikationsteknik (ICT), Centra, VinnExcellence Center for Intelligence in Paper and Packaging, iPACK.
    Lu, Zhonghai
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Elektroniksystem.
    Saakian, Vardan
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Elektroniksystem.
    Chen, Qiang
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Elektroniksystem.
    Yan, Xiaolang
    Institute of VLSI Design, Zhejiang University.
    Zheng, Li-Rong
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Elektroniksystem.
    Item-Level Indoor Localization With Passive UHF RFID Based on Tag Interaction Analysis2013Ingår i: IEEE transactions on industrial electronics (1982. Print), ISSN 0278-0046, E-ISSN 1557-9948, Vol. 61, nr 4, s. 2122-2135Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Radio-frequency identification (RFID) with a received signal strength indicator (RSSI) is a low-cost and low-complexity approach for item-level indoor localization. Although RSSI-based algorithms suffer from multipath effect and other environmental factors, reference tags and RSSI changes can be utilized to further improve the localization accuracy. However, the current algorithms lack deep analysis of the influence of tag interaction on localization accuracy and faces the challenge of simultaneously locating multiple close targets. In this paper, we propose an analysis method about how tag interaction affects a tag antenna radiation pattern and an RSSI change. The tag interaction analysis guides us to improve the design of RSSI-based localization algorithms. We take the k-nearest neighbor (k-NN) algorithm and the Simplex algorithm as two examples. The experimental results show that the revised k-NN and the revised Simplex algorithms are robust to different numbers, spacing, and materials of target objects, and they are superior to other RFID localization schemes, considering cost, capability of simultaneous localization of multiple targets, and location estimation errors.

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