EPE Association: EPE 2018 - LS3d: Electric Vehicle Propulsion systems and their Energy Storage

EPE 2018 - LS3d: Electric Vehicle Propulsion systems and their Energy Storage
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2018 ECCE Europe - Conference > EPE 2018 - Topic 08: Electric Vehicle Propulsion Systems and their Energy Storage > EPE 2018 - LS3d: Electric Vehicle Propulsion systems and their Energy Storage

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   Active Mitigation of Transformer Saturation in a Dual-Active-Bridge Converter for Electric Vehicle Chargers
By Seyed Amir ASSADI [View]
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Abstract: Transformer saturation presents a constant challenge in isolated converter designs, especially when aiming for high power density. This paper presents a non-linear active transformer saturation mitigation technique suitable for Dual-Active-Bridge dc-dc converters, commonly used in on-board Electric Vehicle (EV) battery chargers. The proposed technique detects the variation in the current slope near the boundary of saturation and requires only one low-cost current sensor. The control scheme is demonstrated experimentally on a 450 V, 6.6 kW on-board EV charger, where the DAB transformer is intentionally operated near the limit of saturation and the controller performs the necessary corrective actions. In comparison with the existing active transformer protection methods that sense and control the average current from each DAB full-bridge, the proposed control provides a fast and simple way to detect transformer saturation and take corrective action through duty-cycle control from only one full-bridge. The detection and reaction speed of the proposed controller allows for a reduced safety margin to be used in the transformer design, ultimately leading to an increase in core utilization and converter density.

   Evaluation of Quasi-resonant DC Link Topologies for Soft Switching of Multiple DC-inputs Three Phase Inverter
By Matiss STUNDA [View]
[Download]

Abstract: Possible soft-switching solutions for a Multiple DC-inputs Direct Electric Power Converter are investigated. Quasi-Resonant DC link circuits are considered for the task. By optimizing the resulting combination, a novel topology is developed. The resonant operation in combination with multiple powersources is modelled. Equations for the resonant circuit trip current calculation are adjusted to supportdual input operation.

   Highly Efficient Integrated Low-Voltage Multi-Phase Inverter for ISCAD Application
By Benjamin RUBEY [View]
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Abstract: Low-voltage inverters become more and more attractive due to their superior electrical safety functions.But in general, low-voltage inverters are limited in their maximum electrical output power. Thus, thispaper presents an integrated inverter for 48 V automotive applications based on the ISCAD technologywith a maximum electrical output power of 250 kW.

   Low Voltage Power Supply in Modular Multilevel Converter based Split Battery Systems for Electrical Vehicles
By Florian HELLING [View]
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Abstract: Usually the low voltage power supply in electric vehicles is generated out of the high voltage DC-BUSby a dedicated DC/DC converter. When substituting the conventional drive train/motor converter by amodular multilevel converter with split batteries, this DC-BUS is obliterated. In this paper weintroduce an approach to generate this low voltage supply efficiently based on the modular concept.By adding just, a single capacitor based module to each converter arm, a solution for an efficientbidirectional energy exchange between the low voltage power supply and the traction battery can berealized.The comparison to state-of-the art solutions shows that the new approach enables an efficientintegration not only of the low voltage power supply, but of any energy consumer and producer intosplit Battery Storage Systems. It will be shown by simulations and measurements on a first prototype,that an implementation based on that technology enables a power exchange in any operation point ofthe electrical vehicle.

EPE 2018 - LS3d: Electric Vehicle Propulsion systems and their Energy Storage
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2018 ECCE Europe - Conference > EPE 2018 - Topic 08: Electric Vehicle Propulsion Systems and their Energy Storage > EPE 2018 - LS3d: Electric Vehicle Propulsion systems and their Energy Storage
	[return to parent folder]

	Active Mitigation of Transformer Saturation in a Dual-Active-Bridge Converter for Electric Vehicle Chargers By Seyed Amir ASSADI	[View] [Download]
Abstract: Transformer saturation presents a constant challenge in isolated converter designs, especially when aiming for high power density. This paper presents a non-linear active transformer saturation mitigation technique suitable for Dual-Active-Bridge dc-dc converters, commonly used in on-board Electric Vehicle (EV) battery chargers. The proposed technique detects the variation in the current slope near the boundary of saturation and requires only one low-cost current sensor. The control scheme is demonstrated experimentally on a 450 V, 6.6 kW on-board EV charger, where the DAB transformer is intentionally operated near the limit of saturation and the controller performs the necessary corrective actions. In comparison with the existing active transformer protection methods that sense and control the average current from each DAB full-bridge, the proposed control provides a fast and simple way to detect transformer saturation and take corrective action through duty-cycle control from only one full-bridge. The detection and reaction speed of the proposed controller allows for a reduced safety margin to be used in the transformer design, ultimately leading to an increase in core utilization and converter density.

	Evaluation of Quasi-resonant DC Link Topologies for Soft Switching of Multiple DC-inputs Three Phase Inverter By Matiss STUNDA	[View] [Download]
Abstract: Possible soft-switching solutions for a Multiple DC-inputs Direct Electric Power Converter are investigated. Quasi-Resonant DC link circuits are considered for the task. By optimizing the resulting combination, a novel topology is developed. The resonant operation in combination with multiple powersources is modelled. Equations for the resonant circuit trip current calculation are adjusted to supportdual input operation.

	Highly Efficient Integrated Low-Voltage Multi-Phase Inverter for ISCAD Application By Benjamin RUBEY	[View] [Download]
Abstract: Low-voltage inverters become more and more attractive due to their superior electrical safety functions.But in general, low-voltage inverters are limited in their maximum electrical output power. Thus, thispaper presents an integrated inverter for 48 V automotive applications based on the ISCAD technologywith a maximum electrical output power of 250 kW.

	Low Voltage Power Supply in Modular Multilevel Converter based Split Battery Systems for Electrical Vehicles By Florian HELLING	[View] [Download]
Abstract: Usually the low voltage power supply in electric vehicles is generated out of the high voltage DC-BUSby a dedicated DC/DC converter. When substituting the conventional drive train/motor converter by amodular multilevel converter with split batteries, this DC-BUS is obliterated. In this paper weintroduce an approach to generate this low voltage supply efficiently based on the modular concept.By adding just, a single capacitor based module to each converter arm, a solution for an efficientbidirectional energy exchange between the low voltage power supply and the traction battery can berealized.The comparison to state-of-the art solutions shows that the new approach enables an efficientintegration not only of the low voltage power supply, but of any energy consumer and producer intosplit Battery Storage Systems. It will be shown by simulations and measurements on a first prototype,that an implementation based on that technology enables a power exchange in any operation point ofthe electrical vehicle.