Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 17 of 17 for “"current harmonics"”.
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9-Phase inverter driven motor
… is included, which shows the influence of phase current harmonics upon output torque.
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Methods for assessing the impact of silicon carbide traction inverters in electric vehicles
… and more complex and flexible HV Direct Current (DC) bus designs. Emerging semiconductor technologies, such as Silicon Carbide (SiC) Metal-Oxide-Semiconductor Field-Effect Transistors (MOSFETs), hold promise for increased efficiency and extended range. To ensure the safe and reliable …
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Effects of Input Power Factor Correction on Variable Speed Drive Systems
… harmonic content, magnitude of the system input current and input power factor is particularly addressed in this dissertation along with the development of analytical methods applicable to the steady-state analysis of input power factor corrected VSD systems. Three different types of motors - the …
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Modelling and real-time simulation of a modular bidirectional solid-state transformer for ultra-fast charging of electric vehicles
… balance and unity power factor, and to mitigate current harmonics and voltage ripples in compliance with IEEE standards, validated by Model-in-the-Loop real-time simulation.
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Optimum Control for Minimization of Torque Ripple in Synchronous Reluctance Machines
… the machine, magnet flux density distribution, current harmonics and non-idealities in position and current sensors. Harmonic orders and magnitudes of torque ripple developed due to various sources are analyzed. A new control strategy considering saturation is proposed for Synchronous Reluctance …
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Control Design and Analysis of an Advanced Induction Motor Electric Vehicle Drive
… drive system, an inverter with hysteresis current control is compared to the same inverter with space vector modulation in steady state and on separate driving profiles. A method for determining induction motor harmonic losses is introduced and is based on obtaining the phase current …
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Investigation of Control Concepts for High-Speed Induction Machine Drives and Grid Side Pulse-Width Modulation Voltage Source Converters
… components according to the given maximum grid current harmonics (e.g. IEEE-519) is a complex task. So far a precise and clear design procedure has not been presented. A new procedure to design the grid side filter (L- and LCL-filter) is proposed using the analytical expression of the converter …
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Power transformer magnetization under GIC/GMD
Geomagnetically induced currents (GIC) could saturate a transformer core. Two significant effects are the abnormal stray flux in transformers and extremely large harmonic contents in excitation currents, which can lead to serious equipment damage and power system misoperation. Such incidents have …
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Adaptive Critic-based Control of Voltage Source Converters in Microgrid Systems
… with a number of drawbacks such as poor harmonics attenuation and unsatisfactory operation in case of load changes and high penetration of distributed generators. In this Ph.D. thesis, three different control algorithms are proposed for VSCs in microgrid systems. The control systems are …
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Advanced Single-Stage Power Factor Correction Techniques
… power factor correction (VS-CPPFC) converters, current source CPPFC converters, combined voltage source current source (VSCS) CPPFC converters, and continuous input current (CIC) CPPFC converters. Integrated single-stage PFC converters are first developed, which combine the PFC converter with a …
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Electromagnetic modeling and variable-speed-operation characteristics of inverter-driven, high-frequency, low-inductance permanent magnet synchronous machines
Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2024-05-01
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Intentional and Unintentional Light Emission Diode in Power Electronics applications
… of view. In fact, the driver controls the input current of the LED light bulb that must be compliant with the standards and regulations concerning currents harmonic. Furthermore, the whole lighting system must meet the standards. In this perspective, a sufficient power factor (PF) must be …
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Power quality enhancement at distribution level utilizing the unified power quality conditioner (UPQC)
… the reactive power requirement and generation of harmonics that pollutes the power distribution system. Moreover, modern equipments are becoming highly sensitive to the voltage supplied to them. Increasing the generation capacities of existing power stations is difficult and expensive due to …
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Evaluation and mitigation of the undesired effect of DC bias on inverter power transformer
… to meet the requirement. Two main causes of DC current in inverter power transformer are: 1) Non-linearity and asymmetry in its switching mechanism which may result in undesired DC current at its input. This DC current introduced into an inverter transformer results in the transformer's magnetic …
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Integrated on-board battery chargers for EVs based on multiphase machines and power electronics
… operation. Therefore, although three-phase currents flow through machines’ stator windings, they are not capable of producing a torque; thus the machines do not have to be mechanically locked. The principal advantage is that either very few or no new elements are required in order to realise …
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Design of High-Density Filter Building Blocks for SiC-based Three-Phase Power Converters
… emissions, total harmonic distortion (THD) and current harmonics. While at the motor end, long cable and bearing/leakage current effects are prevalent. As such, typically bulky passive filters are recommended to comply with industry regulations and allow safe and reliable system operation, which …
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Active Source Management to Maintain High Efficiency in Resonant Conversion over Wide Load Range
High-frequency and large amplitude current is a driving requirement for applications such as induction heating, wireless power transfer, power amplifier for magnetic resonant imaging, electronic ballasts, and ozone generators. Voltage-fed resonant inverters are normally employed, however, …