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  • 1.
    Jin, Lebing
    et al.
    KTH, Skolan för elektro- och systemteknik (EES), Elektrisk energiomvandling.
    Norrga, Staffan
    KTH, Skolan för elektro- och systemteknik (EES), Elektrisk energiomvandling.
    Wallmark, Oskar
    KTH, Skolan för elektro- och systemteknik (EES), Elektrisk energiomvandling.
    Nikouei Harnefors, Mojgan
    KTH, Skolan för elektro- och systemteknik (EES), Elektrisk energiomvandling.
    Control and modulation of the stacked polyphase bridges inverter2014Inngår i: IEEE Energy Conversion Congress and Exposition, IEEE, 2014, s. 3023-3029Konferansepaper (Fagfellevurdert)
    Abstract [en]

    In order to meet the requirements of future electric vehicle (EV) drive systems, new converter topologies are required. The stacked polyphase bridges (SPB) inverter is a new topology which is well adapted to the needs for future EVs. In addition to low power losses, the SPB inverter also has fault tolerance ability and good dynamic behavior. This paper presents a further analysis of the control and modulation concept of the SPB inverter. Simulation results are used to verify the analysis conclusions.

  • 2.
    Nikouei Harnefors, Mojgan
    et al.
    KTH, Skolan för elektro- och systemteknik (EES).
    Wallmark, Oskar
    KTH, Skolan för elektro- och systemteknik (EES).
    Harnefors, Lennart
    KTH, Skolan för elektro- och systemteknik (EES).
    Nee, Hans-Peter
    KTH, Skolan för elektro- och systemteknik (EES).
    Operation Under Fault Conditions of the Stacked Polyphase Bridges Converter2016Konferansepaper (Fagfellevurdert)
    Abstract [en]

    The stacked polyphase bridges converter consists of several submodules that, on the input dc side, all are connected in series. Whereas controller designs presented in previous studies have been found promising for realizing equal voltage sharing between submodules, the survival and stability under fault conditions have not been studied. This paper presents a control strategy that enables survival of the converter after the occurrence of a sudden short circuit of a single transistor switch. The results are verified by simulations.

  • 3.
    Nikouie Harnefors, Mojgan
    et al.
    KTH, Skolan för elektro- och systemteknik (EES), Elektrisk energiomvandling.
    Jin, Lebing
    KTH, Skolan för elektro- och systemteknik (EES), Elektrisk energiomvandling.
    Harnefors, Lennart
    ABB Corporate Research, Västerås, Sweden.
    Wallmark, Oskar
    KTH, Skolan för elektro- och systemteknik (EES), Elektrisk energiomvandling.
    Leksell, Mats
    KTH, Skolan för elektro- och systemteknik (EES), Elektrisk energiomvandling.
    Norrga, Staffan
    KTH, Skolan för elektro- och systemteknik (EES), Elektrisk energiomvandling.
    Analysis of the dc-link stability for the stacked polyphase bridges converter2015Inngår i: 2015 17th European Conference on Power Electronics and Applications (EPE'15 ECCE-Europe), IEEE , 2015Konferansepaper (Fagfellevurdert)
    Abstract [en]

    This paper presents an analysis of the capacitor voltage stability for a stacked polyphase bridges (SPB)

    type converter. The SPB converter comprises of several submodules which are connected in series.

    Therefore, stability of the dc-link voltage is very important to investigate. From the analysis, a corresponding

    controller and an analytical expression for stability are derived. The proposed controller and

    the associated stability condition are verified in a simulation environment and on a small experimental

    setup.

  • 4.
    Nikouie Harnefors, Mojgan
    et al.
    KTH, Skolan för elektro- och systemteknik (EES), Elkraftteknik.
    Wallmark, Oskar
    KTH, Skolan för elektro- och systemteknik (EES), Elkraftteknik.
    Jin, Lebing
    KTH, Skolan för elektro- och systemteknik (EES), Elkraftteknik.
    Harnefors, Lennart
    ABB, Corporate Research, Sweden.
    Nee, Hans-Peter
    KTH, Skolan för elektro- och systemteknik (EES), Elkraftteknik.
    DC-link stability analysis and controller design for the stacked polyphase bridges converter2017Inngår i: IEEE transactions on power electronics, ISSN 0885-8993, E-ISSN 1941-0107, Vol. 32, nr 2, s. 1666-1674, artikkel-id 7451258Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The stacked polyphase bridges (SPB) converter consists of several submodules that all are connected in series to a voltage source. The total dc-link voltage should split in a balanced way among the submodules. This does not always occur inherently. This paper presents an analysis of the capacitor voltage stability for the SPB converter. From the analysis, criteria for stability are derived and three alternatives of a suitable balancing controller are designed. The proposed controller alternatives and their associated stability properties are verified on an experimental setup and by simulation.

  • 5.
    Nikouie, Mojgan
    KTH, Skolan för elektro- och systemteknik (EES).
    A highly integrated electric drive systems for Tomorrow's EVs and HEVs2017Konferansepaper (Fagfellevurdert)
  • 6.
    Wallmark, Oskar
    et al.
    KTH, Skolan för elektroteknik och datavetenskap (EECS), Elektroteknik, Elkraftteknik.
    Nikouei Harnefors, Mojgan
    KTH, Skolan för elektroteknik och datavetenskap (EECS), Elektroteknik, Elkraftteknik.
    Dc-link and machine design considerations for resonant controllers adopted in automotive PMSM drives2020Inngår i: IET ELECTRICAL SYSTEMS IN TRANSPORTATION, ISSN 2042-9738, Vol. 10, nr 1, s. 75-80Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    This study presents an analysis of the harmonic content on the dc-link (battery) side in electric drives with permanent-magnet synchronous machines (PMSMs) adopting fractional-slot concentrated windings (FSCWs) which can have a significant harmonic content. An analytical expression for predicting the ripple content in the dc-link (battery) current utilising data from a two-dimensional finite element method (2D-FEM) based model is presented and found to be in good agreement with corresponding experimental results. The FEM model is also used to demonstrate that the resulting harmonic content in the phase currents when operating at speeds well above the bandwidth of a conventional proportional + integral type controller can result in a substantial increase in magnet losses. Finally, a previously reported, experimentally evaluated model of an automotive traction battery and the associated battery cable is combined with an implemented model of the FSCW-PMSM (utilising data from the 2D-FEM model), converter and control to predict the resulting harmonic content in the battery current. The presented methods can be utilised when analysing the impact of harmonics on both the ac and dc sides of an automotive electric drive system.

  • 7.
    Wallmark, Oskar
    et al.
    KTH, Skolan för elektroteknik och datavetenskap (EECS), Elkraftteknik.
    Nikouei Harnefors, Mojgan
    KTH, Skolan för elektroteknik och datavetenskap (EECS), Elkraftteknik.
    DC-link and machine design considerationsfor resonant controllers adopted in automotive PMSM drivesInngår i: Artikkel i tidsskrift (Fagfellevurdert)
  • 8.
    Zhang, Hui
    et al.
    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.
    Norrga, Staffan
    KTH, Skolan för elektro- och systemteknik (EES), Elektrisk energiomvandling.
    Harnefors, Mojgan
    KTH, Skolan för elektro- och systemteknik (EES), Elektrisk energiomvandling.
    Jin, Lebing
    KTH, Skolan för elektro- och systemteknik (EES), Elektrisk energiomvandling.
    Machine design considerations for an MHF/SPB-converter based electric drive2014Inngår i: 2014 The 40th Annual Conference of the IEEE Industrial Electronics Society, IECON 2014, 2014, s. 3849-3854Konferansepaper (Fagfellevurdert)
    Abstract [en]

    This paper identifies suitable phase/slot/pole combinationsfor fractional-slot concentrated winding (FSCW)permanent-magnet machines when forming an integrated electricdrive together with a modular high frequency (MHF) converteror a stacked polyphase bridge (SPB) converter.

1 - 8 of 8
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