EPE Association: EPE 2018 - DS1i: Industry specific Energy Conversion and Conditioning Technologies

EPE 2018 - DS1i: Industry specific Energy Conversion and Conditioning Technologies
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2018 ECCE Europe - Conference > EPE 2018 - Topic 09: Industry-Specific Energy Conversion and Conditioning Technologies > EPE 2018 - DS1i: Industry specific Energy Conversion and Conditioning Technologies

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   A Bias Supply Scheme for a Self-Powered EMS for Battery-less IoT Applications Powered by Electromagnetic Energy Harvesters
By Mahmoud SHOUSHA [View]
[Download]

Abstract: This paper presents a bias supply scheme for a self-powered energy management system (EMS) for internet of things (IoT) applications powered by ultra-low-voltage electromagnetic energy harvesters (EMEHs). The bias supply scheme utilizes the first two cycle of the EMEH voltage to provide a start-up voltage, with the help of a two-stage Villard charge pump, to the control circuit. Then, it utilizes the unregulated intermediate voltage of the EMS alongside a single stage charge pump with a floating capacitor to sustain the operation of the system. The bias supply scheme is completely passive and can be implemented with off-shelf discrete components or on a standard technology node. The EMS is also capable of providing a tight output voltage regulation using a tiny magnetic substrate based dc-dc converter. Experimental results show the effectiveness of the presented solution to operate with an ultra-low-voltage EMEH that has a damped voltage characteristics from 0.8V to 10mV. Also, the tiny magnetic substrate based dc-dc converter provides a tight regulated voltage of 1.2V at 5mA for group of wireless sensors while achieving efficiency around 83\% for load currents between 100µA and 200mA.

   Auxiliary Large Power Converter Supplying with 2.1 … 4.7 kV DC Contact Line for Russian Railways
By Valery MELESHIN [View]
[Download]

Abstract: In Russia, railways work with some AC and DC contact voltages, including 3 kV DC. This paper examines the design work of an auxiliary converter with large power (235 kW) on the trade-off procedure. A solution suggests a two- and three- sectional variant of the auxiliary power converter (APC) permitting the ability to lower the dimensions of the design, to make a simpler, more reliable and maintainable a high-voltage part. Redundancy has been considered, including one section of an electrical locomotive and between other sections as well. The actions of the APC under strong effects of an input voltage should keep the design with normally operating without damaging any components of a power mesh. Some other important items developing the APC, such as reserve controller, digital filters, and EMI points are also examined. Modeling and experiment results verify an analysis.

   Comparison of core material of high frequency transformer
By Taiga SAMEJIMA [View]
[Download]

Abstract: In this paper, we will try to improve the efficiency of high frequency transformers. Loss is increased by increasing the frequency, so losses are reduced using various methods. There are several ways to reduce the loss, but in this paper we will focus on the iron core material of the transformer. We prepare several transformers made of four kinds of materials and measure and compare the losses. Measure the winding resistance in the high frequency region, confirm the skin effect and the proximity effect.

   Development of a high-resolution digital firing system for Static Var Compensators
By Zoi BLATSI [View]
[Download]

Abstract: Static Var Compensators (SVCs) are electrical installations, which assure the power quality of an electrical network, by providing voltage support, harmonic filtering and reactive power compensation. They are particularly interesting for distribution network of a particle accelerator, since the quality on the network voltage has a direct impact on the particle beam. A controller prototype was realized with standard CERN control crate electronics, with an embedded Digital Signal Processor (DSP) implementing regulation and firing algorithms. The proposed controller architecture addresses solutions to several challenges inherent in an SVC firing system, such as accurate synchronization with the network voltage and high resolution of the firing pulses. Hardware-in-the-loop (HIL) simulation results validate the proposed scheme.

   Development of Low Loss Inverter System adopted Lower Harmonic Losses Technology, and Ultra Compact Inverters adopted High Power Density SiC Module
By Hiroshi KOGURE [View]
[Download]

Abstract: We have developed energy-efficient traction power supply systems and traction systems through the use of compact inverters that use low-loss power devices based on a new material, SiC, as well as electric motors designed for lower harmonic losses and the development of PWM control techniques. The energy consumption rate for a railway vehicle achieved by using SiC modules, induction motors with lower harmonic losses, and PWM control, and by expanding the area outputting regeneration torque, was 37.1\% lower relative to conventional systems when tested on existing rolling stock operating on suburban and commuter lines. We developed new 3.3 kV/800 A SiC power modules. The weight of the developed inverter has been reduced by 55\% of a conventional IGBT inverter, by adopting a SiC module, a compact cooler and a lightweight oil-free capacitor.

   Differences in dimensioning SiC MOSFETs and Si IGBTs for Traction Inverters
By Tobias KESTLER [View]
[Download]

Abstract: This paper describes, how the dimensioning of SiC MOSFETs and Si IGBTs for light railway differs in various aspects due to their specific electrical and thermal properties. Instead of comparing IGBT and SiC modules with the same nominal current, the output current during a load cycle is scaled to identify the maximum output capability for a given power cycling lifetime. Furthermore, it is shown which specific properties of the SiC MOSFET lead to the significantly increased current density in comparison to Si IGBT modules.

   Hybrid Power Source Three-level Inveter System Using Overhead Line and Storage Battery in Combination
By Katsumi ISHIKAWA [View]
[Download]

Abstract: The world's first development of a hybrid power source three-level inverter system using overhead line and storage battery in combination for railway vehicles is proposed. In this system, the method for managing the stored electric energy has been clarified, and it was revealed that according to calculations, the highest energy saving effect can be achieved when the voltage of the storage battery is set to about 1300V, and that there is a 13\% increase in the power regenerative consumption rate compared to the conventional two-level inverter system. The proposed method is verified by the experimental tests with a scaled-down model.

   SiC MOSFET based Auxiliary Power Supply for rail vehicles
By Martin HELSPER [View]
[Download]

Abstract: This article describes the motivation and introduction of SiC MOSFET technology for Auxiliary Power Supplies (APS) in railway applications. The results show that its utilization is promising by using an innovative system dimensioning. Presented results of investigations and the realization of an APS prototype prove the expected benefits especially in terms of higher efficiency und higher power-weight ratio.

EPE 2018 - DS1i: Industry specific Energy Conversion and Conditioning Technologies
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2018 ECCE Europe - Conference > EPE 2018 - Topic 09: Industry-Specific Energy Conversion and Conditioning Technologies > EPE 2018 - DS1i: Industry specific Energy Conversion and Conditioning Technologies
	[return to parent folder]

	A Bias Supply Scheme for a Self-Powered EMS for Battery-less IoT Applications Powered by Electromagnetic Energy Harvesters By Mahmoud SHOUSHA	[View] [Download]
Abstract: This paper presents a bias supply scheme for a self-powered energy management system (EMS) for internet of things (IoT) applications powered by ultra-low-voltage electromagnetic energy harvesters (EMEHs). The bias supply scheme utilizes the first two cycle of the EMEH voltage to provide a start-up voltage, with the help of a two-stage Villard charge pump, to the control circuit. Then, it utilizes the unregulated intermediate voltage of the EMS alongside a single stage charge pump with a floating capacitor to sustain the operation of the system. The bias supply scheme is completely passive and can be implemented with off-shelf discrete components or on a standard technology node. The EMS is also capable of providing a tight output voltage regulation using a tiny magnetic substrate based dc-dc converter. Experimental results show the effectiveness of the presented solution to operate with an ultra-low-voltage EMEH that has a damped voltage characteristics from 0.8V to 10mV. Also, the tiny magnetic substrate based dc-dc converter provides a tight regulated voltage of 1.2V at 5mA for group of wireless sensors while achieving efficiency around 83\% for load currents between 100µA and 200mA.

	Auxiliary Large Power Converter Supplying with 2.1 … 4.7 kV DC Contact Line for Russian Railways By Valery MELESHIN	[View] [Download]
Abstract: In Russia, railways work with some AC and DC contact voltages, including 3 kV DC. This paper examines the design work of an auxiliary converter with large power (235 kW) on the trade-off procedure. A solution suggests a two- and three- sectional variant of the auxiliary power converter (APC) permitting the ability to lower the dimensions of the design, to make a simpler, more reliable and maintainable a high-voltage part. Redundancy has been considered, including one section of an electrical locomotive and between other sections as well. The actions of the APC under strong effects of an input voltage should keep the design with normally operating without damaging any components of a power mesh. Some other important items developing the APC, such as reserve controller, digital filters, and EMI points are also examined. Modeling and experiment results verify an analysis.

	Comparison of core material of high frequency transformer By Taiga SAMEJIMA	[View] [Download]
Abstract: In this paper, we will try to improve the efficiency of high frequency transformers. Loss is increased by increasing the frequency, so losses are reduced using various methods. There are several ways to reduce the loss, but in this paper we will focus on the iron core material of the transformer. We prepare several transformers made of four kinds of materials and measure and compare the losses. Measure the winding resistance in the high frequency region, confirm the skin effect and the proximity effect.

	Development of a high-resolution digital firing system for Static Var Compensators By Zoi BLATSI	[View] [Download]
Abstract: Static Var Compensators (SVCs) are electrical installations, which assure the power quality of an electrical network, by providing voltage support, harmonic filtering and reactive power compensation. They are particularly interesting for distribution network of a particle accelerator, since the quality on the network voltage has a direct impact on the particle beam. A controller prototype was realized with standard CERN control crate electronics, with an embedded Digital Signal Processor (DSP) implementing regulation and firing algorithms. The proposed controller architecture addresses solutions to several challenges inherent in an SVC firing system, such as accurate synchronization with the network voltage and high resolution of the firing pulses. Hardware-in-the-loop (HIL) simulation results validate the proposed scheme.

	Development of Low Loss Inverter System adopted Lower Harmonic Losses Technology, and Ultra Compact Inverters adopted High Power Density SiC Module By Hiroshi KOGURE	[View] [Download]
Abstract: We have developed energy-efficient traction power supply systems and traction systems through the use of compact inverters that use low-loss power devices based on a new material, SiC, as well as electric motors designed for lower harmonic losses and the development of PWM control techniques. The energy consumption rate for a railway vehicle achieved by using SiC modules, induction motors with lower harmonic losses, and PWM control, and by expanding the area outputting regeneration torque, was 37.1\% lower relative to conventional systems when tested on existing rolling stock operating on suburban and commuter lines. We developed new 3.3 kV/800 A SiC power modules. The weight of the developed inverter has been reduced by 55\% of a conventional IGBT inverter, by adopting a SiC module, a compact cooler and a lightweight oil-free capacitor.

	Differences in dimensioning SiC MOSFETs and Si IGBTs for Traction Inverters By Tobias KESTLER	[View] [Download]
Abstract: This paper describes, how the dimensioning of SiC MOSFETs and Si IGBTs for light railway differs in various aspects due to their specific electrical and thermal properties. Instead of comparing IGBT and SiC modules with the same nominal current, the output current during a load cycle is scaled to identify the maximum output capability for a given power cycling lifetime. Furthermore, it is shown which specific properties of the SiC MOSFET lead to the significantly increased current density in comparison to Si IGBT modules.

	Hybrid Power Source Three-level Inveter System Using Overhead Line and Storage Battery in Combination By Katsumi ISHIKAWA	[View] [Download]
Abstract: The world's first development of a hybrid power source three-level inverter system using overhead line and storage battery in combination for railway vehicles is proposed. In this system, the method for managing the stored electric energy has been clarified, and it was revealed that according to calculations, the highest energy saving effect can be achieved when the voltage of the storage battery is set to about 1300V, and that there is a 13\% increase in the power regenerative consumption rate compared to the conventional two-level inverter system. The proposed method is verified by the experimental tests with a scaled-down model.

	SiC MOSFET based Auxiliary Power Supply for rail vehicles By Martin HELSPER	[View] [Download]
Abstract: This article describes the motivation and introduction of SiC MOSFET technology for Auxiliary Power Supplies (APS) in railway applications. The results show that its utilization is promising by using an innovative system dimensioning. Presented results of investigations and the realization of an APS prototype prove the expected benefits especially in terms of higher efficiency und higher power-weight ratio.