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.
Results
Showing 1 to 20 of 24 for “"voltage balancing"”.
-
Voltage Balancing Techniques for Flying Capacitors Used in Soft-Switching Multilevel Active Power Filters
This dissertation presents voltage stabilization techniques for flying capacitors used in soft-switching multilevel active power filters. The proposed active filter has proved to be a solution for power system harmonics produced by static high power converters. However, voltage unbalance of the …
-
Device Voltage Balancing from Device-level to Converter-level in High Power Density Medium Voltage Converter using 10 kV SiC MOSFETs
… electronics systems which can provide medium-voltage (MV) to high-voltage (HV) output (>13.8 kV ac, > 20 kV dc) with much faster dynamic response (> 10 kHz bandwidth) or high switching-frequency will enable new electronic energy network architectures, like MVDC power delivery, underground …
-
Series-Connection of Silicon Carbide MOSFET Modules using Active Gate-Drivers with dv/dt Control
This work investigates the voltage scaling feasibility of several low voltage SiC MOSFET modules operated as a single series-connected switch using active gate control. Both multilevel and two-level topologies are capable of achieving higher blocking voltages in high-power converter applications. …
-
A series-stacked power delivery architecture with isolated converters for energy efficient data centers
… more power efficient DC power distribution and voltage regulation for future data centers are investigated. The conventional way of delivering DC power to a server rack in data centers generally contains a central converter that regulates a DC bus, which is typically at 380V rectified grid …
-
Development of pulsed power sources using self-sustaining nonlinear transmission lines and high-voltage solid-state switches
… capability of the pulses in terms of frequency, voltage level, and current level to fit varying degrees of requirements. Several pulsed power approaches can generate high-power pulses including direct switch-based pulsers, pulse forming lines (PFLs), Marx generators, nonlinear transmission lines …
-
Current Shuttling Cell Voltage Balancers: Design, Evaluation, and Simulation
… as well as load matching in electric grids. Cell voltage balancers are critical to extracting maximal performance out of batteries and to extending their lifespan. Charge pump balancers can quickly and efficiently shuttle charge across battery cells to equalize voltages. Component selection of …
-
Dynamic reconfigurable battery systems via graph-based deep reinforcement learning
… PyBaMM, measuring performance in terms of voltage balancing and State of Charge (SOC) uniformity. Overall, this work establishes a foundation and offers insights for the development of future intelligent reconfigurable battery systems.
-
Controlling the Vienna rectifier using a simplified space vector pulse width modulation technique
… unity Power-Factor (PF) and effective capacitor voltage balancing even after extreme faults. This study introduces a multilevel Power-Factor-Correction (PFC) converter in a 2-stage configuration. The first stage is the Vienna rectifier which has a high boosting ratio. To overcome this issue, a …
-
Protection, Control, and Auxiliary Power of Medium-Voltage High-Frequency SiC Devices
… and higher power density. With higher blocking voltage available, WBG devices, especially the silicon carbide (SiC) metal-oxide-semiconductor field-effect transistor (MOSFET), have been widely explored in various medium-voltage (MV) applications in both industry and academia. However, due to the …
-
Transmission grid strength analysis and operation of inverter-based microgrids
… system. As a result, frequency response and voltage regulation may be adversely affected. For this reason, this work focuses on evaluating transmission system strength and operation of microgrids with inverter-interfaced resources. The strength of the transmission grid with large wind farms …
-
Direct Torque Control for Silicon Carbide Motor Drives
… DTC algorithm, which only utilizes the real voltage space vectors and the virtual space vectors (VSVs) that do not contribute to the neutral point current, is proposed to achieve inherent dc-link capacitor voltage balancing without using any DC-link voltage controls or additional DC-link …
-
Identification of small-signal dq impedances of power electronics converters via single-phase wide-bandwidth injection
… treated, including inner current, outer voltage loop and voltage balancing loops. The designed converter is constructed and integrated with measurement system, providing experimental verification. The proposed multi-level single-phase converter is a natural solution for single-phase shunt …
-
PWM Techniques for Control of Dual-Inverter Supplied Six-Phase Drives
… power to the machine. Second, the same phase voltages can be achieved with half the dc-link voltages on the two inverter inputs compared to the single-sided supply, which can be useful in applications such as electric and hybrid electric vehicles and medium sized ships, where the dc voltage …
-
Control Applications and Economic Evaluations of Distributed Series Reactors in Unbalanced Electrical Transmission Systems
… and mitigate the effects of unbalanced voltages, unbalanced transmission line impedances and unbalanced loads by balancing flows in the phases of an unbalanced line. This dissertation provides several DSR System Design aspects; for a single line by performing an experiment for EHV and …
-
Passive Component Weight Reduction for Three Phase Power Converters
… systems, and the power grid. Three-phase voltage source converters (VSCs) have become the converter of choice in many ac medium- and high-power applications due to their many advantages, such as high efficiency and fast response. For transportation applications, high power density is the …
-
Multiple Three-Phase Induction Generators for Wind Energy Conversion Systems
… set is supplied using an independent 3-phase voltage source inverter (VSI), are studied. It is claimed that these topologies offer advantages in cases where a WECS is connected to a multitude of independent ac or dc microgrids, systems where a single high-voltage dc link is needed or where a …
-
High-performance power converters leveraging capacitor-based energy transfer
… both capacitors and inductors are used in the voltage conversion and power transfer process. Conventional capacitor-based converters, called switched-capacitor (SC) converters, suffer from poor efficiency due to the inevitable charge redistribution process. With a strategic placement of one or …
-
Development of a multilevel converter topology for transformer-less connection of renewable energy systems
… configurations are significant at higher voltage and power ratings. Therefore, a single-stage multilevel converter topology is proposed to simplify the power conversion stage of a transformer-less WECS. Furthermore, the primary design challenges – such as multiple clamping devices, …
-
Control of Power Flow in Transmission Lines using Distributed Series Reactors
… kV and 500 kV lines, where lines of different voltage run in parallel. This model is used to study load growth and the effect of adding DSRs to alleviate resulting overloads, and in particular to alleviate overloads on lines of different voltage running in parallel. The economic benefit of …
-
The Modeling and Control of a Cascaded-Multilevel Converter-Based STATCOM
… and ineffective. To be able to operate in a high-voltage application, a large number of DC capacitors are utilized in a CMC-based STATCOM. All DC capacitor voltages must be balanced in order to avoid over-voltages on any particular link. Not only do these uneven DC voltages introduce voltage …
Page 1 of 2