Advantages of a variable DC-link voltage by using a DC-DC converter in hybrid-electric vehicles

Schoenen, Timo; Kunter, Markus S.; Hennen, Martin D.; Doncker, Rik W. De

doi:10.1109/vppc.2010.5729003

Cited by 77 publications

(26 citation statements)

References 9 publications

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“…This topology has been developed and successfully validated within a full electric vehicle in the publicly funded projects Europahybrid [11] and e performance [23]. The biggest advantage of this propulsion system architecture is its modularity.…”

Section: Next Generation Power Converter Architecturementioning

confidence: 99%

“…In contrast to the battery, the inverter and electric machine can be operated most efficiently at an adjustable dc-link voltage with the aid of dc-to-dc converters [5,] [11], [12]. This is because the switching losses of the inverter can be significantly reduced by dynamic adjustment of the dc-link voltage as function of speed of the machine, which enables lower PWM switching frequencies, lower noise and even transition into six-step operation [13].…”

Section: Introductionmentioning

confidence: 99%

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Key Components of Modular Propulsion Systems for Next Generation Electric Vehicles

et al. 2017

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Abstract-The objective of this paper is to provide an overview of emerging technologies for modular power converter architectures for electric vehicles. Nowadays, the most common electrical drive-train architecture exhibits one single inverter which is directly tied to the battery. As a consequence, only one high-voltage battery module can be applied and the dc-link voltage of the inverter and its apparent power rating is directly dependent on the available battery voltage. To overcome this restriction, modern power converter architectures with a higher degree of freedom have been proposed. These architectures exhibit modular dc-dc converters to allow different battery technologies to be linked to drive inverters operating independently from each other. To make this development feasible, new components and technologies are evolving which enhance the efficiency over mission cycles while ensuring further integration of the power-converter architectures.Wide-bandgap power semiconductors enable high switching frequencies and miniaturization of passive devices. Smart topology enhancements and control methods allow a significant loss reduction, in particular at light loads, resulting in a higher efficiency of the drive train over the entire driving cycle. Highly integrated bidirectional battery charger systems with intelligent charging strategies inhibit battery degradation and provide opportunities for grid stabilization. It is demonstrated how these technologies are realized and implemented to contribute to the development of future electric vehicles.

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Section: Next Generation Power Converter Architecturementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Key Components of Modular Propulsion Systems for Next Generation Electric Vehicles

et al. 2017

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“…By varying the DC-bus voltage, the overall system can obtain higher efficiency in certain regions of operation [15,16,17,18,19,20,22,23]. This topic is the main focus of this paper and will be further explored in the next section.…”

Section: Expanding the Torque Speed Envelopementioning

confidence: 99%

“…It can be seen that before the base speed the MI of S2 is maintained at a higher value compared to S1. Therefore it is expected that there will be improvements in terms of efficiency in the low RPM region [15,16,17,18,19,20].…”

Section: Increasing the System Efficiency Using A Dc-dc Convertermentioning

confidence: 99%

Implementation of an Adjustable Target Modulation Index for a Variable DC Voltage Control in an Electric Delivery Truck

Najmabadi

Humphries

Boulet

2016

WEVJ

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SummaryThis paper introduces an alternative control strategy for the variable voltage control of an electric drivetrain for a Class 4 medium-duty delivery truck and compares the resulting vehicle energy consumption over standardized drive cycles. The baseline system, S1, uses a standard electric drivetrain without a DC-DC and a battery at 460 V. The proposed system, S2, contains a DC-DC converter and a lower voltage battery with three voltage options being investigated: 200 V, 230 V, and 300 V. Previous work has shown that using a bi-directional DC-DC converter, the Fixed Target Modulation Index (FTMI) of the power electronics can be optimized in order to reduce the energy consumption across a drive cycle. In this study an Adjustable Target Modulation Index (ATMI) is proposed, which combines the best aspects of the fixed target modulation index control to attempt to improve efficiency even further. The new control strategy is shown to improve the energy consumption by up to 2.34% over a vehicle with a conventional electric drivetrain, depending on the required drive cycle.

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“…In charging mode the EMS controls the individual battery charging currents. A further task of the EMS is the adaption of the voltage-level of the HV-DC link to the speed dependent voltage requests of the inverters in order to minimize switching losses in the converters [7]. To prevent the drivetrain from overloading the batteries, the EMS also calculates a power limit which must not be exceeded while accelerating or braking.…”

Section: Description Of the Energy Management Systemmentioning

confidence: 99%

Development and Validation of an Energy Management System for an Electric Vehicle with a split Battery Storage System

Becker¹,

Schaeper²,

Rothgang³

et al. 2013

Journal of Electrical Engineering and Technology

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-Within the project 'e performance' supported by the German Ministry of Education and Research (BMBF) an electric vehicle, powered by two lithium-ion battery packs of different capacity and voltage has been developed. The required Energy Management System (EMS) in this system controls the current flows of both packs independently by means of two individual dc-dc converters. It acts as an intermediary between energy storage (battery management systems-BMS) and the drivetrain controller on the vehicle control unit (VCU) as well as the on-board charger. This paper describes the most important tasks of the EMS and its interfaces to the BMS and the VCU. To validate the algorithms before integrating them into the vehicle prototype, a detailed Matlab / Simulink-model was created in the project. Test procedures and results from the simulation as well as experiences and comparisons from the real car are presented at the end.

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Advantages of a variable DC-link voltage by using a DC-DC converter in hybrid-electric vehicles

Cited by 77 publications

References 9 publications

Key Components of Modular Propulsion Systems for Next Generation Electric Vehicles

Key Components of Modular Propulsion Systems for Next Generation Electric Vehicles

Implementation of an Adjustable Target Modulation Index for a Variable DC Voltage Control in an Electric Delivery Truck

Development and Validation of an Energy Management System for an Electric Vehicle with a split Battery Storage System

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