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  • 1. Gan, Chun
    et al.
    Wu, Jianhua
    Sun, Qingguo
    Yang, Shiyou
    Hu, Yihua
    Jin, Lebing
    KTH, School of Electrical Engineering (EES), Electric power and energy systems.
    Low-cost direct instantaneous torque control for switched reluctance motors with bus current detection under soft-chopping mode2016In: IET Power Electronics, ISSN 1755-4535, E-ISSN 1755-4543, Vol. 9, no 3, p. 482-490Article in journal (Refereed)
    Abstract [en]

    This study proposed a low-cost torque distribution function (TSF)-based direct instantaneous torque control (DITC) technique for switched reluctance motors (SRMs) by bus current detection under soft-chopping mode. A three-phase 12/8-pole prototype SRM is employed to analyse the phase currents and operation states, and a new converter connection with bus current sensor placement strategy is presented to replace the phase current sensors in each phase leg. Considering that the conventional bus current contains both the chopping current and demagnetisation current, the current sensor is placed in a new bus to remove all the needless demagnetisation currents. To obtain the chopping current information from the bus current for DITC implementation, pulse-width modulation signals with extremely short turn-off time are injected into the lower transistors to insert the chopping current detection states for brief intervals during each fundamental frequency cycle. The DITC scheme is implemented directly on the detected chopping currents from bus current based on a sinusoidal TSF. The proposed DITC system is more compact and low cost by using just a bus current sensor. The effectiveness of the proposed technique is verified by the simulation and experimental results.

  • 2.
    Jin, Lebing
    KTH, School of Electrical Engineering (EES), Electric power and energy systems.
    Integrated Compact Drives for Electric and Hybrid Electric Vehicles2016Doctoral thesis, comprehensive summary (Other academic)
    Abstract [en]

    To develop more competitive solutions, one of the trends in the development of drive systems for electric and hybrid electric vehicles (EVs/HEVs) is to integrate the power electronic converter and the electric motor. This thesis aims to investigate the performance and the operation of modular converters in integrated motor drive systems for EVs/HEVs.

    In the first part, the concept of integrated modular motor drive systems for EVs/HEVs is introduced. Three suitable modular converter topologies, namely, the stacked polyphase bridges (SPB) converter, the parallel-connected polyphase bridges (PPB) converter and the modular high frequency (MHF) converter, are evaluated and compared with conventional electric drives in terms of power losses, energy storage requirements, and semiconductor costs.

    In the second part of the thesis, the harmonic content of the dc-link current of the SPB converter is analyzed. By adopting an interleaving modulation the size of the dc-link capacitor can be reduced without increasing the switching frequency, which is beneficial for achieving a compact integrated system. This method allows for around 80% reduction of the dc-link capacitance for vehicle drives, resulting in a significant size reduction of the power converter and improved integration.

    Finally, a communication-based distributed control system for the SPB converter is presented. The communication delay arising from the serial communication is inevitable, thus a timing analysis is also presented. It has been found that stability is maintained even when the baud rate of the SPI communication is lower than 1 Mbps, indicating that other communication protocols with lower bandwidths can also be adopted for this topology.

    The analytical investigations provided in this thesis are validated by experiments on a four-submodule laboratory prototype. Experimental results verify the correctness of the theoretical analysis, as well as the dynamic performance of the distributed control system.

  • 3.
    Jin, Lebing
    et al.
    KTH, School of Electrical Engineering (EES), Electric Power and Energy Systems.
    Norrga, Staffan
    KTH, School of Electrical Engineering (EES), Electric Power and Energy Systems.
    Wallmark, Oskar
    KTH, School of Electrical Engineering (EES), Electric Power and Energy Systems.
    Analysis of power losses in power MOSFET based stacked polyphase bridges converters2016In: 2016 IEEE 8th International Power Electronics and Motion Control Conference (IPEMC-ECCE Asia), Institute of Electrical and Electronics Engineers (IEEE), 2016, p. 3050-3055Conference paper (Refereed)
    Abstract [en]

    The ability to accurately predict power semiconductor losses is essential for converter design and can provide a reference for thermal management. Based on a stacked polyphase bridges converter, a simplified but accurate loss model is used in this paper to calculate the power losses of power MOSFETs and experimentally verified. A special focus of the analysis is the ringing loss calculation since it is inevitable in the switching process of power MOSFETs. In addition, this paper presents a comparison of power losses between Si MOSFET and GaN FET based converters by using the analytical model.

  • 4.
    Jin, Lebing
    et al.
    KTH, School of Electrical Engineering (EES), Electric Power and Energy Systems.
    Norrga, Staffan
    KTH, School of Electrical Engineering (EES), Electric Power and Energy Systems.
    Wallmark, Oskar
    KTH, School of Electrical Engineering (EES), Electric Power and Energy Systems.
    Serial communication based distributed control of the stacked polyphase bridges converter2016In: 8th IET International Conference on Power Electronics, Machines and Drives (PEMD 2016), IET , 2016Conference paper (Refereed)
    Abstract [en]

    In recent years, the stacked polyphase bridges converter has gained increasing interest due to its modularity and scalability for different power and voltage levels. To maintain the advantages from this architecture, distributed control system is required instead of centralized control system. A serial communication protocol based distributed control architecture for an SPB converter consisting of four submodules is presented and experimentally verified in this paper. Moreover, the sensitiveness of the distributed control system to modulation effect, communication delay, and communication speed is also investigated.

  • 5.
    Jin, Lebing
    et al.
    KTH, School of Electrical Engineering (EES), Electric Power and Energy Systems.
    Norrga, Staffan
    KTH, School of Electrical Engineering (EES), Electric Power and Energy Systems.
    Wallmark, Oskar
    KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering.
    Apostolopoulos, Nikolaos
    Communication-Based Distributed Control of the Stacked Polyphase Bridges Converter2018In: IEEE transactions on industrial electronics (1982. Print), ISSN 0278-0046, E-ISSN 1557-9948, Vol. 65, no 2, p. 1011-1020Article in journal (Refereed)
    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.

  • 6.
    Jin, Lebing
    et al.
    KTH, School of Electrical Engineering (EES), Electric Power and Energy Systems.
    Norrga, Staffan
    KTH, School of Electrical Engineering (EES), Electric Power and Energy Systems.
    Wallmark, Oskar
    KTH, School of Electrical Engineering (EES), Electric Power and Energy Systems.
    Apostolopoulos, Nikolaos
    KTH, School of Electrical Engineering (EES), Electric Power and Energy Systems.
    Modulation and Power Losses of a Stacked Polyphase Bridges Converter2017In: IEEE Journal of Emerging and Selected Topics in Power Electronics, ISSN 2168-6777, E-ISSN 2168-6785, Vol. 5, no 1, p. 409-418Article in journal (Refereed)
    Abstract [en]

    This paper presents and analyzes modulation and power losses of a stacked polyphase bridges converter - a modular topology potentially allowing increased compactness and fault tolerance for automotive drive systems. In particular, an analysis of the impact of modulation on the harmonic content of the dc-link current of the converter is made. Due to the possibility of using higher switching frequency devices, the current ripple of the stacked polyphase bridges converter can be smaller than that of the two-level three-phase converter with the same dclink capacitor. However, higher switching frequency will result in higher switching losses per fundamental period. Therefore, this paper also investigates the reduction in the dc-link ripple current achieved by interleaving the modulation between the different converter submodules. The amount of reduction can be predicted using an analytical model whose results are demonstrated to be in good agreement with results from corresponding simulations and from an experimental setup. Furthermore, based on the experimentally verified analysis, the stacked polyphase bridges converter in a typical automotive drive system is discussed and compared to a conventional two-level three-phase converter.

  • 7.
    Jin, Lebing
    et al.
    KTH, School of Electrical Engineering (EES), Electrical Energy Conversion.
    Norrga, Staffan
    KTH, School of Electrical Engineering (EES), Electrical Energy Conversion.
    Wallmark, Oskar
    KTH, School of Electrical Engineering (EES), Electrical Energy Conversion.
    Nikouei Harnefors, Mojgan
    KTH, School of Electrical Engineering (EES), Electrical Energy Conversion.
    Control and modulation of the stacked polyphase bridges inverter2014In: IEEE Energy Conversion Congress and Exposition, IEEE, 2014, p. 3023-3029Conference paper (Refereed)
    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.

  • 8.
    Jin, Lebing
    et al.
    KTH, School of Electrical Engineering (EES), Electric power and energy systems.
    Norrga, Staffan
    KTH, School of Electrical Engineering (EES), Electric power and energy systems.
    Zhang, Hui
    KTH, School of Electrical Engineering (EES), Electric power and energy systems.
    Wallmark, Oskar
    KTH, School of Electrical Engineering (EES), Electric power and energy systems.
    Evaluation of a Multiphase Drive System in EV and HEV Applications2015In: 2015 IEEE INTERNATIONAL ELECTRIC MACHINES & DRIVES CONFERENCE (IEMDC), Institute of Electrical and Electronics Engineers (IEEE), 2015, p. 941-945Conference paper (Refereed)
    Abstract [en]

    Multiphase machine drive systems have been applied in many electric propulsion fields such as aerospace and electric vehicle applications. With the development of SiC semiconductors, its superior characteristic makes compact multiphase converters possible. Moreover, by using a single chip in each switch, problems caused by an uneven current split between paralleled devices can be avoided. This paper presents a performance evaluation for a 50 kW multiphase EV/HEV drive system with 1.2 kV SiC MOSFETs. Power loss calculation, cost comparison and system simulation are provided to illustrate the feasibility of the proposed concept.

  • 9.
    Jin, Lebing
    et al.
    KTH, School of Electrical Engineering (EES), Electric power and energy systems.
    Staffan, Norrga
    KTH, School of Electrical Engineering (EES), Electric power and energy systems.
    Wallmark, Oskar
    KTH, School of Electrical Engineering (EES), Electric power and energy systems.
    Communication-based distributed control of the stacked polyphase bridges converterIn: IEEE transactions on industrial electronics (1982. Print), ISSN 0278-0046, E-ISSN 1557-9948Article in journal (Refereed)
    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.

  • 10.
    Jin, Lebing
    et al.
    KTH, School of Electrical Engineering (EES), Electric power and energy systems.
    Zhang, Hui
    KTH, School of Electrical Engineering (EES), Electric power and energy systems.
    Wallmark, Oskar
    KTH, School of Electrical Engineering (EES), Electric power and energy systems.
    Norrga, Staffan
    KTH, School of Electrical Engineering (EES), Electric power and energy systems.
    Comparison and Evaluation of Modular Integrated Electric Drives for Automotive Traction ApplicationsIn: IEEE Transactions on Transportation Electrification, ISSN 2332-7782Article in journal (Refereed)
    Abstract [en]

    In order to increase the competitiveness of the integrated motor drives (IMDs), alternative topologies have been developed for electric and hybrid electric vehicles. Within this framework, the integrated modular motor drive (IMMD) concept has been proposed, aiming to make the system more compact and fault-tolerant. Potential converter topologies for an IMMD are reviewed in this paper, with particular focus on the stacked polyphase bridges converter, the parallel-connected polyphase bridges converter and the modular high frequency converter. The machine topologies that are the best candidates to be used in such drive systems are also presented. Based on the FreedomCar 2020 specifications, a comparative evaluation of the studied topologies is presented and discussed in terms of machine design, power losses, energy storage requirements, and cell redundancy. The conventional two-level three-phase drive system is utilized as the reference. Finally, predicted costs of the studied drive systems are compared for both fault-tolerant designs and non-fault tolerant designs.

  • 11.
    Nikouie Harnefors, Mojgan
    et al.
    KTH, School of Electrical Engineering (EES), Electrical Energy Conversion.
    Jin, Lebing
    KTH, School of Electrical Engineering (EES), Electrical Energy Conversion.
    Harnefors, Lennart
    ABB Corporate Research, Västerås, Sweden.
    Wallmark, Oskar
    KTH, School of Electrical Engineering (EES), Electrical Energy Conversion.
    Leksell, Mats
    KTH, School of Electrical Engineering (EES), Electrical Energy Conversion.
    Norrga, Staffan
    KTH, School of Electrical Engineering (EES), Electrical Energy Conversion.
    Analysis of the dc-link stability for the stacked polyphase bridges converter2015In: 2015 17th European Conference on Power Electronics and Applications (EPE'15 ECCE-Europe), IEEE , 2015Conference paper (Refereed)
    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.

  • 12.
    Nikouie Harnefors, Mojgan
    et al.
    KTH, School of Electrical Engineering (EES), Electric Power and Energy Systems.
    Wallmark, Oskar
    KTH, School of Electrical Engineering (EES), Electric Power and Energy Systems.
    Jin, Lebing
    KTH, School of Electrical Engineering (EES), Electric Power and Energy Systems.
    Harnefors, Lennart
    ABB, Corporate Research, Sweden.
    Nee, Hans-Peter
    KTH, School of Electrical Engineering (EES), Electric Power and Energy Systems.
    DC-link stability analysis and controller design for the stacked polyphase bridges converter2017In: IEEE transactions on power electronics, ISSN 0885-8993, E-ISSN 1941-0107, Vol. 32, no 2, p. 1666-1674, article id 7451258Article in journal (Refereed)
    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.

  • 13.
    Norrga, Staffan
    et al.
    KTH, School of Electrical Engineering (EES), Electrical Energy Conversion.
    Jin, Lebing
    KTH, School of Electrical Engineering (EES), Electrical Energy Conversion.
    Wallmark, Oskar
    KTH, School of Electrical Engineering (EES), Electrical Energy Conversion.
    Mayer, Anna
    Universität der Bundeswehr München.
    Ilves, Kalle
    KTH, School of Electrical Engineering (EES), Electrical Energy Conversion.
    A Novel Inverter Topology for Compact EV and HEV Drive Systems2013In: 39th Annual Conference of the IEEE Industrial Electronics Society, IECON 2013, IEEE , 2013, p. 6590-6595Conference paper (Refereed)
    Abstract [en]

    This paper describes a new modular inverter topol­ogy suitable for compact drive systems in electric road vehicles. The topology is based on dc-side cascading of three-phase two ­level inverter bridges, each feeding a set of three-phase windings of a motor. This topology is compared by calculation to the known modular high-frequency (MHF) converter, and is found to have similar losses and semiconductor expenditure requirements. Simulations verify the dynamic and static properties of the converter in a realistic application.

  • 14.
    Zhang, Hui
    et al.
    KTH, School of Electrical Engineering (EES), Electric Power and Energy Systems.
    Jin, Lebing
    KTH, School of Electrical Engineering (EES), Electric Power and Energy Systems.
    Wallmark, Oskar
    KTH, School of Electrical Engineering (EES), Electric Power and Energy Systems.
    Norrga, Staffan
    KTH, School of Electrical Engineering (EES), Electric Power and Energy Systems.
    Evaluation of Modular Integrated Electric Drive Concepts for Automotive Traction Applications2017In: IEEE Transactions on Transportation ElectrificationArticle in journal (Other academic)
    Abstract [en]

    In order to achieve compactness and realize a certain level of fault tolerance in integrated motor drives, a number of integrated modular motor drive concepts have been proposed in recent years. In this paper, converter topology candidates suitable for an IMMD are considered with particular focus on the stacked polyphase bridges cconverter; the parallel-connected polyphase bridges converter, and the modular high frequency converter. A comparative evaluation of the studied topologies is presented and discussed in terms of machine design aspects, power losses, capacitor energy storage requirements, costs, and cell redundancy using the conventional two-level three-phase drive system as reference.

  • 15.
    Zhang, Hui
    et al.
    KTH, School of Electrical Engineering (EES), Electrical Energy Conversion.
    Wallmark, Oskar
    KTH, School of Electrical Engineering (EES), Electrical Energy Conversion.
    Leksell, Mats
    KTH, School of Electrical Engineering (EES), Electrical Energy Conversion.
    Norrga, Staffan
    KTH, School of Electrical Engineering (EES), Electrical Energy Conversion.
    Harnefors, Mojgan
    KTH, School of Electrical Engineering (EES), Electrical Energy Conversion.
    Jin, Lebing
    KTH, School of Electrical Engineering (EES), Electrical Energy Conversion.
    Machine design considerations for an MHF/SPB-converter based electric drive2014In: 2014 The 40th Annual Conference of the IEEE Industrial Electronics Society, IECON 2014, 2014, p. 3849-3854Conference paper (Refereed)
    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 - 15 of 15
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