EPE Association: EPE 2023 - LS4a: Focus Topic 4

EPE 2023 - LS4a: Focus Topic 4 - Electric Vehicles
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2023 ECCE Europe - Conference > EPE 2023 - Topic 11: Focus Topics > EPE 2023 - LS4a: Focus Topic 4 - Electric Vehicles

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   Adaptive Control of a Synchronous Reluctance Traction Drive for Electric Vehicles
By Nikolay DJAGAROV, Hristo MILUSHEV, Julia DJAGAROVA, Dimitar TSVETANOV, Frede BLAABJERG [View]
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Abstract: Environmental requirements to reduce greenhouse gases caused the appearance of regulatory documents and decisions of international organizations for the development and widespread use of electric traction in cars. One of the most important parts of electric cars is the traction drive, using a different type of electric motors. One of the most promising electric motors is the synchronous reluctance motor (SynRM). The paper proposes a new adaptive control of reluctance traction drive combining the use of two control loops: a conventional loop and an adaptive control loop based on an optimal singular adaptive observer. This control compensates for the delay of the signal in the conventional control loop, as a result of which the quality of speed regulation is improved under various disturbances and when the speed reference is changed. A mathematical model of this drive was created, with the help of which different modes were studied and some of the obtained results were presented.

   Driving Cycle Power Loss Analysis of SiC-MOSFET and Si-IGBT Traction Inverters for Electric Vehicles
By Michael SCHLUETER, Marius GENTEJOHANN, Sibylle DIECKERHOFF [View]
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Abstract: This paper presents the calculation process for a detailed and fast analysis of EV traction inverter losses applying either MOSFETs or IGBTs in arbitrary driving cycles. An open-source tool was developed and every step of the calculation - starting with the driving cycle, the driving resistances, the set points of the permanent magnet synchronous motor, the modulation scheme, and finally the inverter loss calculation - is presented. A SiC-MOSFET and a Si-IGBT-based inverter with similar ratings and identical housing are compared exemplarily for various driving cycles. Static and dynamic losses derived from double-pulse tests of the SiC-MOSFET and continuous measurements from a dynamometer test bench are compared to datasheet values and calculation results. In all analyzed operation points, the SiC-MOSFET has lower losses than the Si-IGBT, although the performance advantage of the SiC-device is higher for driving cycles with a high amount of partial-load operation points. For high-power operation points or driving cycles with high power demands the advantage is less pronounced.

   Ultra-Wide Voltage Gain Hybrid Modulated CLLC Converter for Electric Vehicle
By Akshay MAHAJAN, Yam SIWAKOTI, Christof WITTWER [View]
[Download]

Abstract: Improved modulation and control methods for the same topology yield significant efficiency improvements, reduction of passive component dimensions and help to achieve high power density. In this paper, a hybrid modulation scheme is proposed for an isolated CLLC converter for a portable EV battery charging system. Wide output voltage (150 V - 950 V) with decent flat efficiency is achieved without additional power processing stage.

EPE 2023 - LS4a: Focus Topic 4 - Electric Vehicles
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2023 ECCE Europe - Conference > EPE 2023 - Topic 11: Focus Topics > EPE 2023 - LS4a: Focus Topic 4 - Electric Vehicles
	[return to parent folder]

	Adaptive Control of a Synchronous Reluctance Traction Drive for Electric Vehicles By Nikolay DJAGAROV, Hristo MILUSHEV, Julia DJAGAROVA, Dimitar TSVETANOV, Frede BLAABJERG	[View] [Download]
Abstract: Environmental requirements to reduce greenhouse gases caused the appearance of regulatory documents and decisions of international organizations for the development and widespread use of electric traction in cars. One of the most important parts of electric cars is the traction drive, using a different type of electric motors. One of the most promising electric motors is the synchronous reluctance motor (SynRM). The paper proposes a new adaptive control of reluctance traction drive combining the use of two control loops: a conventional loop and an adaptive control loop based on an optimal singular adaptive observer. This control compensates for the delay of the signal in the conventional control loop, as a result of which the quality of speed regulation is improved under various disturbances and when the speed reference is changed. A mathematical model of this drive was created, with the help of which different modes were studied and some of the obtained results were presented.

	Driving Cycle Power Loss Analysis of SiC-MOSFET and Si-IGBT Traction Inverters for Electric Vehicles By Michael SCHLUETER, Marius GENTEJOHANN, Sibylle DIECKERHOFF	[View] [Download]
Abstract: This paper presents the calculation process for a detailed and fast analysis of EV traction inverter losses applying either MOSFETs or IGBTs in arbitrary driving cycles. An open-source tool was developed and every step of the calculation - starting with the driving cycle, the driving resistances, the set points of the permanent magnet synchronous motor, the modulation scheme, and finally the inverter loss calculation - is presented. A SiC-MOSFET and a Si-IGBT-based inverter with similar ratings and identical housing are compared exemplarily for various driving cycles. Static and dynamic losses derived from double-pulse tests of the SiC-MOSFET and continuous measurements from a dynamometer test bench are compared to datasheet values and calculation results. In all analyzed operation points, the SiC-MOSFET has lower losses than the Si-IGBT, although the performance advantage of the SiC-device is higher for driving cycles with a high amount of partial-load operation points. For high-power operation points or driving cycles with high power demands the advantage is less pronounced.

	Ultra-Wide Voltage Gain Hybrid Modulated CLLC Converter for Electric Vehicle By Akshay MAHAJAN, Yam SIWAKOTI, Christof WITTWER	[View] [Download]
Abstract: Improved modulation and control methods for the same topology yield significant efficiency improvements, reduction of passive component dimensions and help to achieve high power density. In this paper, a hybrid modulation scheme is proposed for an isolated CLLC converter for a portable EV battery charging system. Wide output voltage (150 V - 950 V) with decent flat efficiency is achieved without additional power processing stage.