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Design of Wide Bandgap-based Sensorless Current-source Inverter Integrated Motor Drive

2022
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Release : 2022
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Book Synopsis Design of Wide Bandgap-based Sensorless Current-source Inverter Integrated Motor Drive by : Renato Amorim Torres (Ph.D.)

Download or read book Design of Wide Bandgap-based Sensorless Current-source Inverter Integrated Motor Drive written by Renato Amorim Torres (Ph.D.). This book was released on 2022. Available in PDF, EPUB and Kindle. Book excerpt: Integrated motor drives (IMDs) can deliver substantial economic benefits by replacing low-efficiency fixed-speed motors with compact adjustable-speed drives that combine the power electronics and motor into the same physical structure. IMDs are currently implemented using voltage-source inverters since this topology is naturally compatible with conventional silicon-based power devices. However, major advances in the development of new types of power semiconductor switches made from wide-bandgap (WBG) semiconductor materials such as silicon carbide and gallium nitride open intriguing opportunities for the development of reverse-voltage-blocking switches that are well-suited for use in current-source inverters (CSIs). These WBG power switches are capable of operating efficiently at high switching frequencies (>100 kHz) and high junction temperatures (>150[degrees]C). Since the selection of the inverter topology is highly dependent on the power device characteristics, the emergence of power devices with new semiconductor properties demands a reevaluation of the system configuration. Therefore, this thesis investigates the combination of new WBG power devices and CSIs for use in integrated motor drive applications. Additionally, as the power electronics has its volume substantially reduced by employing WBG devices, the rotor position sensor becomes one of the largest components of the motor drive. Therefore, its elimination is advantageous from the cost and reliability perspective and allows higher power density and better packaging. Different design aspects are analyzed and addressed in this thesis to develop a high-performance 3kW sensorless CSI-IMD, such as system modeling, sizing and selection of components, development of new modulation strategies that allow the employment of four-quadrant switches and improve the inverter efficiency, development of new control strategies, the combination of sensorless techniques that allows an SPM machine-based CSI-IMD to operate in the full speed-range, and investigation of different cooling strategies.

Investigation of Current Source Inverter Using Wide Bandgap Devices for Integrated Motor Drive Applications

2021
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Release : 2021
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Book Synopsis Investigation of Current Source Inverter Using Wide Bandgap Devices for Integrated Motor Drive Applications by : Hang Dai

Download or read book Investigation of Current Source Inverter Using Wide Bandgap Devices for Integrated Motor Drive Applications written by Hang Dai. This book was released on 2021. Available in PDF, EPUB and Kindle. Book excerpt: This research program has investigated the introduction of wide bandgap (WBG) power semiconductor switches into current-source inverters (CSIs) to achieve several performance advantages over conventional voltage-source inverters (VSIs) in motor drive applications, with a particular focus on integrated motor drives (IMDs).A detailed analysis comparing two-level CSIs and two-level VSIs using WBG devices is presented, showing that CSIs offer several advantages over the baseline VSI topology when WBG devices are introduced at high switching frequencies. These include sinusoidal output voltage and current waveforms, improved compatibility with elevated temperature operation, lower leakage current and conducted common-mode (CM) electromagnetic interference (EMI), and high power density values that make them appealing for IMD applications. However, CSIs require switches with reverse-voltage-blocking (RVB) capability. In the absence of monolithic RVB switch devices, several hybrid switch configurations are presented that provide this RVB capability as reverse-blocking (RB) or bidirectional (BD) switches. Several CSI topologies and modulation algorithms are presented using these switches. A new space vector pulsewidth modulation (SVPWM) algorithm is proposed for the conventional CSI topology (H6-CSI) using six BD switches that prevents transient current spikes and voltage pulses. A new modulation scheme is proposed that enables the H7-CSI topology using six BD switches and one RB switch to achieve higher efficiency. A new high-efficiency CSI topology (H8-CSI) using six BD switches is proposed that adds an eighth active switch to the H7-CSI topology, enabling simplified gate signals. Analysis and suppression of CM-EMI in WBG-CSIs have been investigated. A new equivalent circuit (EQC) that can accurately and rapidly predict the CM-EMI frequency spectra is proposed. The CM-EMI of a three-phase current-source converter (CSC) system consisting of both rectifier and inverter stages has also been evaluated using an extended EQC. These EQCs have been successfully utilized to analyze and suppress the CM-EMI spectral envelopes in both CSIs and CSCs. Finally, a high-performance WBG-CSI integrated into the housing of a 3kW PM synchronous motor has been developed and tested. The measured performance of the CSI-IMD confirms the CSI's ability to simultaneously achieve high efficiency, high power density, and low CM-EMI while delivering high-quality sinusoidal motor excitation waveforms.

Investigation of Voltage-boosting Current Source Inverters for Integrated Motor Drives

2024
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Release : 2024
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Book Synopsis Investigation of Voltage-boosting Current Source Inverters for Integrated Motor Drives by : Feida Chen (Ph.D.)

Download or read book Investigation of Voltage-boosting Current Source Inverters for Integrated Motor Drives written by Feida Chen (Ph.D.). This book was released on 2024. Available in PDF, EPUB and Kindle. Book excerpt: The objective of this research is to investigate a high-efficiency CSI-based integrated motor drive (IMD) by using voltage boost function and soft-switching technique. First, the commutation processes of the voltage-source inverter (VSI) and current-source inverter (CSI) are analyzed and compared. The impact of the parasitic components in the CSI current commutation loop between the two-phase legs and output capacitors on high-frequency SiC devices' performance is analyzed. Two CSI benchtop prototype units, one with SiC discrete devices and the other with power modules, have been designed and tested, and the performances of the two CSIs are compared. Second, the design of a power-dense CSI-based IMD system using WBG switches for EV traction applications including the IMD structure, power electronics, and cooling system is presented. Attention is devoted to the design of each of the major IMD sub-systems including the dc/dc converter, CSI, passive components, controller, sensors, and the combined liquid/air thermal management system. Both analytical and measured performance results are provided for the prototype IMD system. In addition, an "apples-to-apples" comparison of VSI- and CSI-based motor drive systems with the same performance capabilities is presented. More specifically, sine filters are added to the VSI output terminals to match the CSI performance, and a front-end boost converter is added to the VSI to match the CSI's voltage-boost capability. Third, the voltage and current trajectories of SiC MOSFETs in the switching transition of a CSI-based motor drive system are analyzed in detail and compared with VSI. A high-accuracy loss model of SiC MOSFETs in the CSI is proposed considering the current commutation and parasitic parameters in the current commutation loop. A CSI-based double pulse test is developed to verify the proposed switching transient characteristics and switching loss model. The 3-phase CSI experimental results verified that the proposed power loss model has higher accuracy than the conventional loss model. Fourth, the voltage boosting feature of the CSI is investigated to improve the overall efficiency of the CSI-based motor drive system. The effects of the boost function on the total system losses are described based on the proposed CSI loss model and double pulse test results. In addition, the impacts of the current angle and voltage boost ratio on the CSI efficiency and power factor are investigated, considering the effect of the filter capacitors at the CSI output terminals. A genetic algorithm has been used to optimize the CSI's switching frequency and modulation index to maximize the drive system efficiency under any desired operating condition. The investigation of voltage-boost features is extended to the emerging seven-switch current-source inverter (H7-CSI) to enhance the efficiency of CSI-based motor drive systems. Finally, a novel soft-switching method for CSI is investigated to increase the CSI efficiency and reduce the overshoot issues of the WBG devices. The system configuration, working principle, circuit design, and control schemes are described in detail. The performance of the proposed soft-switching CSI is verified by simulation and experiment. It is shown that the proposed soft-switching circuit can significantly decrease the switching loss and improve efficiency.

Wide Bandgap Device-based Power Converter for Integrated Motor Drive System

2020 Electric current converters
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Release : 2020
Genre : Electric current converters
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Book Synopsis Wide Bandgap Device-based Power Converter for Integrated Motor Drive System by : Tianyu Chen

Download or read book Wide Bandgap Device-based Power Converter for Integrated Motor Drive System written by Tianyu Chen. This book was released on 2020. Available in PDF, EPUB and Kindle. Book excerpt: Power electronics converters have been widely applied to motor drive systems to decrease the energy consumption by allowing for variable frequency operation. With the requirement of carbon emission reduction, variable frequency drive system will become a trend in the future. Conventional power converters employ Silicon IGBT and are physically separated from the electric machines. With the development of wide bandgap power semiconductors, such as SiC MOSFET and GaN HEMT, it becomes possible to build high temperature, high power density converter and integrate the power converter directly into housing of the motors. However, because of the limited space, high temperature, and high magnetic flux density inside electric machines, integration of power converter into a motor becomes a challenging work. This study presents the research on high power density converter and the integration of power converter into an induction motor. In this study, two prototypes of GaN HEMT-based power converter are built and integrated into a 3-hp induction motor. The PCB layout of power stage is investigated and optimized. The leakage magnetic flux on the surface of the power converter is simulated and experimentally measured. To facilitate the thermal dissipation of the power converter, the motor endcap is redesigned and the thermal analysis is performed for the integrated motor drive system as a whole. The topologies of power converter with an active front-end rectifier are investigated and compared, and the totem-pole rectifier with power pulsation buffer is selected as the front-end stage. With the GaN converter integrated into the induction motor, the variable frequency operation of the integrated motor drive system is validated through experimental test..

Modular Multilevel Converters

2018-02-22 Science
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Release : 2018-02-22
Genre : Science
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Book Rating : 239/5 ( reviews)

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Book Synopsis Modular Multilevel Converters by : Sixing Du

Download or read book Modular Multilevel Converters written by Sixing Du. This book was released on 2018-02-22. Available in PDF, EPUB and Kindle. Book excerpt: An invaluable academic reference for the area of high-power converters, covering all the latest developments in the field High-power multilevel converters are well known in industry and academia as one of the preferred choices for efficient power conversion. Over the past decade, several power converters have been developed and commercialized in the form of standard and customized products that power a wide range of industrial applications. Currently, the modular multilevel converter is a fast-growing technology and has received wide acceptance from both industry and academia. Providing adequate technical background for graduate- and undergraduate-level teaching, this book includes a comprehensive analysis of the conventional and advanced modular multilevel converters employed in motor drives, HVDC systems, and power quality improvement. Modular Multilevel Converters: Analysis, Control, and Applications provides an overview of high-power converters, reference frame theory, classical control methods, pulse width modulation schemes, advanced model predictive control methods, modeling of ac drives, advanced drive control schemes, modeling and control of HVDC systems, active and reactive power control, power quality problems, reactive power, harmonics and unbalance compensation, modeling and control of static synchronous compensators (STATCOM) and unified power quality compensators. Furthermore, this book: Explores technical challenges, modeling, and control of various modular multilevel converters in a wide range of applications such as transformer and transformerless motor drives, high voltage direct current transmission systems, and power quality improvement Reflects the latest developments in high-power converters in medium-voltage motor drive systems Offers design guidance with tables, charts graphs, and MATLAB simulations Modular Multilevel Converters: Analysis, Control, and Applications is a valuable reference book for academic researchers, practicing engineers, and other professionals in the field of high power converters. It also serves well as a textbook for graduate-level students.

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