EPE Association: EPE 2018 - DS3k: Batteries Management Systems, Battery Chargers

EPE 2018 - DS3k: Batteries Management Systems, Battery Chargers
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 - DS3k: Batteries Management Systems, Battery Chargers

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   A 50 kW Compact and Efficient Charger Prototype Utilizing SiC Power Modules and Nanocrystalline Magnetic Materials
By Saeid HAGHBIN [View]
[Download]

Abstract: Operating frequency of a power converter is the key factor to achieve a compact design. However, increasing the switching frequency increases loss components in semiconductors and magnetic materials. Power modules based on SiC and magnetic materials based on nanocrystalline have lower losses compared to classical devices such as silicon based power modules or ferrite magnetic materials in a certain frequency range. A 50 kW compact and efficient prototype for fast charging is designed and constructed that SiC power modules and naocrystalline magnetic materials are utilized in the converter to achieve a compact and efficient converter. The constructed hardware and some practical aspects of the design are presented in this paper.

   A 7.5 kW OFF-BOARD THREE-PHASE FAST CHARGER PROTOTYPE FOR ELECTRIC VEHICLES
By Camilo SUAREZ [View]
[Download]

Abstract: This paper describes the implementation of a7.5 kW off-board Electric Vehicle (EV) fast charger prototype. It is composed by a three-phase hybrid rectifier with power factor correction (AC/DC stage), followed by an interleaved buck converter (DC/DC stage). At AC/DC stage, sinusoidal input phase currents are imposed, and consequently low Total Harmonic Distortion (THD) is obtained by the use of Zero Current Switching (ZCS) SEPIC rectifiers when applying a simple hysteresis control. These converters manage a fraction of the total power delivered by the hybrid rectifier, reducing the semiconductors current stress and allowing the use of this topology for high power levels. The interleaved buck converter is controlled by Pulse Width Modulation (PWM), allowing Constant Current - Constant Voltage (CCCV) charging technique, typically used in Lithium-ion (Li) batteries and Supercapacitors (SC).

   Bi-directional Power Transfer of a Contactless Electric Vehicle Charger Using Direct Three-Phase to Single-Phase AC/AC Converter
By Ferdi Perdana KUSUMAH [View]
[Download]

Abstract: This paper explains a bi-directional power transfer operation of an inductive charger using a direct three-phase to single-phase AC/AC converter. The converter has a fewer switches than a matrix converter with the same functionality and uses a resonant circuit to utilize zero-current switching. The charger is designed to charge electric vehicle battery, and the transfer operation will be applied to support power grid through a vehicle-to-grid application. The paper focuses on power transfer analysis of a series-series inductive power system with a switching frequency generated from a resonant current. Equivalent circuit and steady-state equations were developed to predict system behavior. Analytical calculations were compared with simulation outcomes for validation purposes. The analysis shows that the coupled system has three resonant frequencies, and power transfer capacity is affected by circuit coupling factor and battery voltage level.

   On-board impedance diagnostics method of Li-ion traction batteries using pseudo-random binary sequences
By Zeyang GENG [View]
[Download]

Abstract: This work deals with the on-board impedance measurements of Li-ion batteries on hybrid electric vehicles/electric vehicles by using pseudo-random binary sequences (PRBSs). The impedance of the battery can be related to its state of charge (SOC) and state of health (SOH). However the battery impedance is frequency dependent which makes it difficult to perform the measurement on a pack level in the vehicles. By using an excitation signal like PRBS, it is possible to extract the impedance information of the battery packs.Experiments are performed with different set-ups to verify the PRBS method. A non-parametric method is used to process the data and extract the impedance measurement. Experiments in the laboratory at different state of charge levels and temperatures are made to validate the PRBS method. It is shown that the PRBS method can produce a valid electrochemical impedance spectrum in a limited frequency range, similar to the result from a high accuracy laboratory impedance analyzer. The method is stable atdifferent SOC levels and temperatures.A simulation of the excitation signal in the vehicle is performed where the electric motor is used as theload. It shows that it is possible to some extent to use the driveline in a hybrid electric vehicle/electric vehicle to perform an on-board battery impedance measurement.

   Solar powered e-bike charging station with AC, DC and contactless charging
By Gautham Ram CHANDRA MOULI [View]
[Download]

Abstract: Charging electric vehicles from solar energy provides a sustainable means of transportation. This paper shows the design of solar powered e-bike charging station that provides AC, DC and contactless charging of e-bikes. The DC charger allows direct DC charging of the e-bike from the DC power of the photovoltaic panels (PV) without the need for an external AC charger adapter. In case of the contactless charger, the bike can be charged without the use of any cables providing maximum convenience to the user. Finally, the charging station has an integrated battery that allows for both grid-connected and off-grid operation.

   Wireless Inductive Power Transfer: Design and Control for An optimal Operation
By Mustapha DEBBOU [View]
[Download]

Abstract: Wireless power transfer (WPT) using magnetic resonance is the technology which could set human free from the annoying wires and allow charging Electric Vehicle (EV) during its motion. WPT technology is developing rapidly in recent years. At kilowatts power level, the power transfer distance increases from several millimeters to several hundred millimeters with a requirement for grid to load efficiency above 90\%. The advances make the WPT very attractive to the electric vehicle (EV) charging applications in both stationary and dynamic charging scenarios. This paper treats the design, modelling and control strategy of an innovative dynamic WPT system. Simulation and experimental tests are carried out to demonstrate the validity of the proposed power electronic converter topology.

EPE 2018 - DS3k: Batteries Management Systems, Battery Chargers
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 - DS3k: Batteries Management Systems, Battery Chargers
	[return to parent folder]

	A 50 kW Compact and Efficient Charger Prototype Utilizing SiC Power Modules and Nanocrystalline Magnetic Materials By Saeid HAGHBIN	[View] [Download]
Abstract: Operating frequency of a power converter is the key factor to achieve a compact design. However, increasing the switching frequency increases loss components in semiconductors and magnetic materials. Power modules based on SiC and magnetic materials based on nanocrystalline have lower losses compared to classical devices such as silicon based power modules or ferrite magnetic materials in a certain frequency range. A 50 kW compact and efficient prototype for fast charging is designed and constructed that SiC power modules and naocrystalline magnetic materials are utilized in the converter to achieve a compact and efficient converter. The constructed hardware and some practical aspects of the design are presented in this paper.

	A 7.5 kW OFF-BOARD THREE-PHASE FAST CHARGER PROTOTYPE FOR ELECTRIC VEHICLES By Camilo SUAREZ	[View] [Download]
Abstract: This paper describes the implementation of a7.5 kW off-board Electric Vehicle (EV) fast charger prototype. It is composed by a three-phase hybrid rectifier with power factor correction (AC/DC stage), followed by an interleaved buck converter (DC/DC stage). At AC/DC stage, sinusoidal input phase currents are imposed, and consequently low Total Harmonic Distortion (THD) is obtained by the use of Zero Current Switching (ZCS) SEPIC rectifiers when applying a simple hysteresis control. These converters manage a fraction of the total power delivered by the hybrid rectifier, reducing the semiconductors current stress and allowing the use of this topology for high power levels. The interleaved buck converter is controlled by Pulse Width Modulation (PWM), allowing Constant Current - Constant Voltage (CCCV) charging technique, typically used in Lithium-ion (Li) batteries and Supercapacitors (SC).

	Bi-directional Power Transfer of a Contactless Electric Vehicle Charger Using Direct Three-Phase to Single-Phase AC/AC Converter By Ferdi Perdana KUSUMAH	[View] [Download]
Abstract: This paper explains a bi-directional power transfer operation of an inductive charger using a direct three-phase to single-phase AC/AC converter. The converter has a fewer switches than a matrix converter with the same functionality and uses a resonant circuit to utilize zero-current switching. The charger is designed to charge electric vehicle battery, and the transfer operation will be applied to support power grid through a vehicle-to-grid application. The paper focuses on power transfer analysis of a series-series inductive power system with a switching frequency generated from a resonant current. Equivalent circuit and steady-state equations were developed to predict system behavior. Analytical calculations were compared with simulation outcomes for validation purposes. The analysis shows that the coupled system has three resonant frequencies, and power transfer capacity is affected by circuit coupling factor and battery voltage level.

	On-board impedance diagnostics method of Li-ion traction batteries using pseudo-random binary sequences By Zeyang GENG	[View] [Download]
Abstract: This work deals with the on-board impedance measurements of Li-ion batteries on hybrid electric vehicles/electric vehicles by using pseudo-random binary sequences (PRBSs). The impedance of the battery can be related to its state of charge (SOC) and state of health (SOH). However the battery impedance is frequency dependent which makes it difficult to perform the measurement on a pack level in the vehicles. By using an excitation signal like PRBS, it is possible to extract the impedance information of the battery packs.Experiments are performed with different set-ups to verify the PRBS method. A non-parametric method is used to process the data and extract the impedance measurement. Experiments in the laboratory at different state of charge levels and temperatures are made to validate the PRBS method. It is shown that the PRBS method can produce a valid electrochemical impedance spectrum in a limited frequency range, similar to the result from a high accuracy laboratory impedance analyzer. The method is stable atdifferent SOC levels and temperatures.A simulation of the excitation signal in the vehicle is performed where the electric motor is used as theload. It shows that it is possible to some extent to use the driveline in a hybrid electric vehicle/electric vehicle to perform an on-board battery impedance measurement.

	Solar powered e-bike charging station with AC, DC and contactless charging By Gautham Ram CHANDRA MOULI	[View] [Download]
Abstract: Charging electric vehicles from solar energy provides a sustainable means of transportation. This paper shows the design of solar powered e-bike charging station that provides AC, DC and contactless charging of e-bikes. The DC charger allows direct DC charging of the e-bike from the DC power of the photovoltaic panels (PV) without the need for an external AC charger adapter. In case of the contactless charger, the bike can be charged without the use of any cables providing maximum convenience to the user. Finally, the charging station has an integrated battery that allows for both grid-connected and off-grid operation.

	Wireless Inductive Power Transfer: Design and Control for An optimal Operation By Mustapha DEBBOU	[View] [Download]
Abstract: Wireless power transfer (WPT) using magnetic resonance is the technology which could set human free from the annoying wires and allow charging Electric Vehicle (EV) during its motion. WPT technology is developing rapidly in recent years. At kilowatts power level, the power transfer distance increases from several millimeters to several hundred millimeters with a requirement for grid to load efficiency above 90\%. The advances make the WPT very attractive to the electric vehicle (EV) charging applications in both stationary and dynamic charging scenarios. This paper treats the design, modelling and control strategy of an innovative dynamic WPT system. Simulation and experimental tests are carried out to demonstrate the validity of the proposed power electronic converter topology.