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Annual Conference of Industrial electronics Society

作者： A. Emadi Power Electronics and Motor Drives Laboratory Electrical and Computer Engineering Department Illinois Institute of Technology Chicago IL USA

This paper presents a modular approach for the modelling and simulation of multi-converter DC power electronic systems based on the generalized state space averaging method. These systems may consist of many individual converters connected together to form large and complex systems. In addition to simplifying the analysis procedure, by using the proposed method, time step for analysis of the system can be increased. Therefore, required computation time and computer memory for complex systems can be reduced considerably. In this paper, after introducing the proposed method, results of applying the method to a representative system will be presented.

关键词： power system modeling power electronics Computational modeling State-space methods Circuit simulation computer simulation Vehicle dynamics System testing Aerospace electronics Hybrid power systems

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Performance analysis of automotive power systems: effects of power electronic intensive loads and electrically-assisted propulsion systems

Performance analysis of automotive power systems: effects of...

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IEEE Conference on Vehicular Technology (VTC)

作者： S.M. Lukic A. Emadi Power Electronics and Motor Drives Laboratory Electrical and Computer Engineering Department Illinois Institute of Technology Chicago IL USA

Demands for higher fuel economy, performance, and reliability as well as reduced emissions push the automotive industry to seek electrification of ancillaries and engine augmentations. In the future cars, throttle actuation, power steering, anti-lock braking, rear-wheel steering, air-conditioning, ride-height adjustment, active suspension, and electrically heated catalyst will all benefit from the electrical power system. Therefore, a higher system voltage, such as the proposed 42 V, is necessary to handle these new-introduced loads. On the other hand, due to the environmental concerns, there is a definite development towards new electrically-assisted propulsion systems that improve fuel economy. In this paper, the effects of the new introduced electrical systems including hotel and auxiliary loads on the electrical power systems of conventional and more electric cars are presented. Dynamic characteristics of electrical loads are defined for typical drive cycles. Finally, system level issues such as fuel economy and vehicle performances are addressed.

关键词： Performance analysis Automotive engineering power system analysis computing power electronics Propulsion power system reliability Fuel economy power system dynamics Engines power steering

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Modelling of power electronic loads in AC distribution systems using the generalized state space averaging method

Modelling of power electronic loads in AC distribution syste...

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Annual Conference of Industrial electronics Society

作者： A. Emadi Power Electronics and Motor Drives Laboratory Electrical and Computer Engineering Department Illinois Institute of Technology Chicago IL USA

Most of the loads in AC distribution systems have positive incremental impedance characteristic. However, power electronic loads, when tightly regulated, sink constant power from the system. Therefore, they have negative incremental impedance characteristic. This can even cause negative impedance instability. power electronic loads usually have a controlled or uncontrolled rectifier at the front end. In this paper, these loads are modelled using the generalized state space averaging method. An assessment of their effects in AC distribution systems is also presented.

关键词： power system modeling State-space methods power electronics Voltage Impedance power system dynamics power system stability motor drives Load modeling Equivalent circuits

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Phase shift switching scheme for DC/DC boost converter with switches in parallel

Phase shift switching scheme for DC/DC boost converter with ...

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IEEE Conference on Vehicle power and Propulsion (VPPC)

作者： Young-Joo Lee Ali Emadi Power Electronics and Motor Drives Laboratory Electric Power and Power Electronics Center Electrical and Computer Engineering Department Illinois Institute of Technology Chicago IL USA

In general, the interleaved structures in boost converters are able to reduce input current ripple and output voltage ripple leading to smaller size of input/output filters, to have fault tolerance, to take higher bandwidth, and to minimize EMI from reverse recovery current in output rectifier by adopting discontinuous inductor current mode in each interleaved converter. In this paper, a phase shift switching scheme of paralleled switches for boost converter is proposed in which one inductor, two paralleled switches, and one output rectifier comprise the boost converter and provide doubled ripple frequency in current through the inductor, which can contribute to higher system bandwidth, fault tolerance, and reduction in the size of the inductor and input/output filter.

关键词： Switching converters Switches Inductors Bandwidth Rectifiers Voltage Filters Fault tolerance Electromagnetic interference Frequency conversion

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Integrated Bi-Directional AC/DC and DC/DC Converter for Plug-in Hybrid Electric Vehicle Conversion

Integrated Bi-Directional AC/DC and DC/DC Converter for Plug...

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IEEE Conference on Vehicle power and Propulsion (VPPC)

作者： Young-Joo Lee Ali Emadi Grainger Power Electronics and Motor Drives Laboratory Electric Power and Power Electronics Center Electrical and Computer Engineering Department Illinois Institute of Technology Chicago IL USA

As the result of a wide range of efforts to improve fuel economy and reduce emissions of conventional vehicles, hybrid electric vehicle (HEV) technology has been commercialized. HEVs show better mile per gallon (MPG) than conventional vehicles. As a new practical breakthrough to reduce air pollution and fuel consumption, particularly in urban areas, converting HEVs into plug-in hybrid electric vehicles (PHEVs) has been considered significant. PHEVs have a battery pack of high energy density and can run solely on electric power for a given range. The battery pack can be recharged by neighborhood outlet charger. In this paper, a novel integrated bi-directional AC/DC and DC/DC converter (IBADDDC) will be proposed, which is able to function as a battery charger and to transfer electrical energy between battery pack and the high voltage bus of the electric drive train system. It is shown that IBADDDC can provide the reduced number of high current inductors and current transducers, and fault current tolerance in high power applications for PHEV conversion.

关键词： Bidirectional control DC-DC power converters Hybrid electric vehicles Batteries Fuel economy Commercialization Air pollution Urban areas Voltage Inductors

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COUPLED ELECTROMAGNETIC-THERMAL MODELLING OF 3D-PRINTED IRON CORE OF HIGH SPEED PM motor 14

COUPLED ELECTROMAGNETIC-THERMAL MODELLING OF 3D-PRINTED IRON...

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14th Mediterranean Conference on power Generation Transmission, Distribution and Energy Conversion, MEDpower 2024

作者： Pechlivanidou, Maria Sofia C. Polymenakos, Pavlos I. Kladas, Antonios G. Laboratory of Electrical Machines and Power Electronics Department of Electrical and Computer Engineering National Technical University of Athens Iroon Polytechneiou 9 Athens15780 Greece

ISBN: (纸本)9781837242689

Additive manufacturing (also known as 3D-printing) is opening up new ground for innovations in customizable, scalable and cost-efficient motor design solutions. The continuous effort to improve the efficiency and reduce the production costs of electric motors has led researchers to search for new and innovative manufacturing techniques. Such a new technique enabling construction of electric motor parts is 3D printing. The production of mechanical components by means of 3D printing, although is actually at an early stage of adoption, seems to offer important advantages. Thus, the interest of the research community in determining the quality, reliability and performance of 3D printed motor parts grows rapidly, focusing on challenges that are related to the design and construction of high-speed motors with high efficiency and power density. This paper presents the thermal analysis of a particular 3D-printed magnetic iron material (which is commercially available) used for the design and manufacturing of the stator core of a low-power and high-speed permanent magnet synchronous motor. The findings of the simulations were confirmed experimentally. © The Institution of engineering & Technology 2024.

关键词： Permanent magnets

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Control and Stabilization of DC/DC Buck-Boost Converters Loaded by Constant power Loads in Vehicular Systems using a Novel Digital Scheme

Control and Stabilization of DC/DC Buck-Boost Converters Loa...

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International (EPE-PEMC) power electronics and Motion Control Conference

作者： Alireza Khaligh Sheldon S. Williamson Ali Emadi Grainger Power Electronics and Motor Drives Laboratory Electric Power and Power Electronics Center Electrical and Computer Engineering Department Illinois Institute of Technology Chicago IL USA

power electronics based power systems are being increasingly considered for transportation systems such as land, sea/undersea, air, and space vehicles due to their advantages in efficiency, performance, flexibility, and power density. In order to have superior performance, these multi-converter systems need to be rigorously regulated. Dynamic response of tightly regulated power electronic converters in distributed power electronic systems is similar to the dynamic response of a constant power load (CPL), which acts as negative impedance and destabilizes the DC bus and the system. In order to mitigate the instability problem in multi-converter systems, in this paper, we present a novel digital technique to control DC/DC converters driving CPLs in vehicular systems. The proposed method achieves the output voltage regulation based on generating high and low power pulses instead of conventional pulse width modulation (PWM) techniques. It is simple, straight forward, and easy to implement in specifically designed integrated circuits (IC), digital signal processors (DSP), or field programmable gate arrays (FPGA). Moreover, its dynamic response is fast and robust. Simulation results of applying the proposed method to a DC/DC buck-boost converter confirm the analytical results.

关键词： Control systems Pulse width modulation power electronics Vehicle dynamics power system dynamics Space vector pulse width modulation Digital integrated circuits Field programmable gate arrays power systems Air transportation

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State of the Art of Repetitive Control in power electronics and Drive Applications

IEEE Open Journal of Industry Applications

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IEEE Open Journal of Industry Applications 2022年 3卷 13-29页

作者： Tang, Mi Di Benedetto, Marco Bifaretti, Stefano Lidozzi, Alessandro Zanchetta, Pericle Power Electronics Machine and Control Group University of Nottingham NottinghamNG7 2GT United Kingdom Roma Tre University C-PED Center for Power Electronics and Drives Rome00154 Italy Department of Industrial Engineering University of Rome 'Tor Vergata' Rome00133 Italy Department of Electrical and Electronic Engineering University of Nottingham NottinghamNG7 2RD United Kingdom Department of Electrical Computer and Biomedical Engineering University of Pavia Pavia27100 Italy

power electronic systems present a non-linear behavior mainly due to their switching nature. This is often combined with their interaction with non-linear systems, such as other switching converters, diode rectifiers, motor drives, etc. and with possible non linearities of the power grid in the case of grid connected systems. The major effect of these non-linear interactions is the generation of harmonic distortion on voltages and currents (both in DC and AC), which needs to be compensated to achieve high power quality systems. The use of passive filters is often the simplest and most immediate solution;however, this decreases converter efficiency and increases its weight and volume. Thus, the use of a control strategy capable of tracking periodic signals, rejecting periodic disturbance and largely improving steady state behavior and harmonic distortion with a limited bandwidth is a very desirable feature. Repetitive Control (RC) represents an extremely practical and efficient solution for the aforementioned issues, and it is widely employed in many different applications. This paper focuses on state of the art of RC used in power electronics and drives. RC basic concepts, different control structures, design methods, fixed and variable frequency operating conditions, etc. are investigated. Furthermore, many example applications and existing control approaches developed in recent years for power electronics and drive systems based on RC, have also been discussed in detail. © 2020 IEEE.

关键词： Electric drives

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Design and implementation of a mobile single-phase AC power supply for land vehicles with 28V/200V dual voltage alternators

Design and implementation of a mobile single-phase AC power ...

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Future Transportation Technology Conference

作者： Bekiarov, Stoyan B. Emadi, Ali Patterson, Ciaran Pourkermani, Mahmood Becker, James Grainger Power Electronics and Motor Drives Laboratory Electrical and Computer Engineering Department Illinois Institute of Technology Chicago IL 60616-3793 United States C. E. Niehoff and Co. 2021 Lee Street Evanston IL 60202 United States

In land vehicles with high-power electrical loads, other than the low-voltage DC bus (14V, 28V, or 42V) for the low-power conventional loads, a high-voltage bus, e.g., 200V DC, is required for high-power loads such as hotel loads and electrically-assisted propulsion systems. In addition, some advanced electrical loads including luxury loads and AC power point require 120V, 60Hz AC voltage. These land vehicles include heavy duty, fire fighting, and military vehicles. There are two traditional approaches in obtaining a dual DC voltage bus system. The first one is to obtain the low-voltage DC from the alternator and boost it to the high-voltage DC. The second method is to obtain the high-voltage DC directly from the alternator and reduce it to the low-voltage. Both approaches require additional step-up or step-down power conversion stages, which inherently result in a reduced efficiency. In this paper, a new approach with a 28V/200V dual voltage alternator is considered. This system avoids the additional power conversion stage and, as a result, increases the efficiency of the system. The primary objective of this paper is to demonstrate the design and operation of a high power density, 2.5 kW, single-phase, DC/AC pulse width modulated (PWM) inverter. The IGBT-based inverter operates from the 200V DC voltage output of the dual voltage alternator and consists of a low-pass LC filter at its output. The RMS value of the AC output voltage attained from the mobile power supply is 120V at a frequency of 60Hz. The sinusoidal pulse width modulation (SPWM) method is used as the control technique for the purpose of inverter switching. These PWM control signals are generated using a digital signal processor (DSP) and are eventually used to drive the gates of the IGBT switches of the proposed inverter. Due to the simplified power stage and the usage of an efficient DSP-based modulation technique, the total harmonic distortion (THD) of the output voltage is fairly low (less than 2%)

关键词： Insulated gate bipolar transistors (IGBT)

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Selection of Three-phase Inverter Topology and Optimization of the PCB Layout of a T-type Bridge-Leg for power Dense motor Drive Application 4

Selection of Three-phase Inverter Topology and Optimization ...

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4th International Conference on Smart Grid and Renewable Energy, SGRE 2024

作者： Ghaderloo, Reza Asrar Singhabahu, Chanaka Resalayyan, Rakesh Khaligh, Alireza Institute for Systems Research University of Maryland Maryland Power Electronics Laboratory Department of Electrical and Computer Engineering College Park United States

ISBN: (纸本)9798350306262

The topology selection plays a key role in minimizing the losses and improving the output waveform quality of an inverter. In addition, increasing the switching frequency of an inverter help to reduce the size of EMI filters resulting in power density improvement. Use of wide-bandgap device (like SiC devices) enables high switching frequency operation in power electronic converters. However, due to low gate charge and small junction capacitance of SiC devices, the SiC-based inverter is more likely to be influenced by side-effects of fast switching transition like undesired ringing, larger voltage overshoot and mistriggerig due to miller-effect. Parasitic inductances of multiple power loops and gate loops within the inverter leg play a key role in these undesired effects, however, a proper design of PCB-layout can reduce these effects. In this paper, a comparison is conducted between a T-type and 2-level inverter topologies for motor drive applications. Furthermore, a placement configuration of components along with the PCB layout are proposed for a T-type leg to improve its switching transition behavior by reducing the power and gate loop parasitic inductances. The parasitic inductances of proposed configuration are estimated using FEA simulation, and the estimated values are used to simulate the switching transition behavior of a T-type leg. Finally, a Double Pulse Test (DPT) is executed to demonstrate the accurate switching transition behaviour of a T-type leg which is designed with the proposed PCB layout and component placement. © 2024 IEEE.

关键词： Silicon carbide

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