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 20 of 21 for “"Converter control"”.
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DC-DC Converter Control System for the Energy Harvesting from Exercise Machines System
… exercise machines outputting power to DC-DC converters, which then connects to the microinverters. All microinverter outputs tie together and then connect to the grid. The control system, placed around the DC-DC converters, quickly detects changes in current, and limits the current to prevent …
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Grid current control methods for MV wind energy conversion systems
… solution is to make the two-level low voltage converter in parallel in order to achieve sufficient power rating. However, research has found that by employing medium voltage multilevel converters will reduce the cost of energy. Additionally, the grid converter is the only way to connect the …
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Design of zero-current switching DC-DC buck converter
… a zero-current switching (ZCS) DC-DC buck converter design, simulation and application. The converter control uses with ZCS technique to decrease the switching losses. Comparing to conventional buck converter, resonant buck converter includes a resonant tank equipped with resonant inductor …
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FPGA-based digital controller for dc-dc converter
This thesis presents a FPGA-based digital controller for a DC-DC converter. The converter topologies chosen in this project is Non-Inverting Buck-Boost converter. The main difference from DSP-based solution is that FPGA allows simultaneous execution of all control procedures. The control algorithm …
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Digital current mode control for multiple input converters
… the possibility of applying digital current mode control on multiple-input (MI) converters is studied. As for MI topologies having a central energy transfer inductor, the predictive constant on-time current-mode control can greatly reduce both the design and digital realization efforts needed. By …
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Local and Central Controllers for Microgrids
… to learn about microgrids and to design simple controllers for different AC microgrid applications. In addition, this thesis has the objective to provide examples of simulation cases for the hierarchical structure of a basic AC microgrid which can be used as a foundation to build upon, and …
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The design of an H∞ voltage regulator for a predictive current controlled three phase PWM power converter
In this project, an H∞ controller is proposed as a DC voltage regulator for the predictive current controlled pulse with modulated (PWM) three-phase power converter to compensate the uncertainty caused by the predictive current controller. The H∞ theory has its unique approach to the uncertainty …
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Synchronized Communication Network for Real-Time Distributed Control Systems in Modular Power Converters
Emerging large-scale modular power converters are pursuing high-performance distributed control systems. As opposed to the centralized control architecture, the distributed control architecture features shared computational burdens, pulse-width modulation (PWM) latency compensation, simplified …
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Control of power converter for grid integration of renewable energy conversion and STATCOM systems
… and fuel cells require power electronic converters for grid integration. This thesis investigates advanced control technology for grid integration control of renewable energy sources and STATCOM systems. First, the conventional control mechanism of power converters applied in renewable …
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Power Sharing and Power Quality Improvement in Parallel Connected Power Converters in the Microgrid
Power electronics-based Voltage Source Converters (VSCs) have been widely used as an interface between energy source and the grid/load in microgrid system. The VSCs are required not only to provide the basic function that achieves reliable and accurate power sharing in a microgrid, but also to …
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Dynamic modelling and simulation of electric power systems using the Newton-Raphson method
… this thesis, emphasising the representation of converter control modes. The solution approach takes advantage of the strong numerical solutions for combined HVAC-HVDC systems, where power plant and operational imbalances are explicitly taken into account. The dynamic algorithm is particularly …
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Phase-Locked Loops, Islanding Detection and Microgrid Operation of Single-Phase Converter Systems
… DER and ES systems, power electronic converters are needed with not only control systems that operate in multiple modes of operation, but with islanding detection and resynchronization capabilities for isolation from and reclosure to the grid. The proposed system includes control …
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A Novel High-Power High-Efficiency Three-Phase Phase-Shift DC/DC Converter for Fuel Cell Applications
… enable the usage of fuel cell, developing power converters dedicated for fuel cells becomes imminent. Currently, the full-bridge converter is the dominating topology in high power dc/dc applications. Although multiphase converters have been proposed, most of them are dealing with high …
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The Modeling and Advanced Controller Design of Wind, PV and Battery Inverters
… in this Ph.D. dissertation.;A multi-objective controller including is proposed for PV inverter to perform voltage flicker suppression, harmonic reduction and unbalance compensation. A novel supervisory control scheme is designed to coordinate PV and battery inverters to provide high quality …
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Analysis of Inductor-Coupled Zero-Voltage-Transition Converters
As is the case for DC-DC converters, multi-phase converters require both high-quality power control and high power-density. Although a higher switching frequency not only improves the quality of the converter output but also decreases the size of the converter, it increases switching losses and …
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System Frequency Support of Permanent Magnet Synchronous Generator-Based Wind Power Plant
… System (PMSG-WTG) with full power back to back converters tends to become one of the most promising wind turbine technologies thanks to various advantages. It possesses a significant amount of kinetic energy stored in the rotating mass of turbine blades, which can be utilized to enhance the …
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High-density multilevel power converters for use in renewable and transportation applications
… and flying capacitor multilevel (FCML) power converters. While historically limited to energy-dense electrolytic or low-loss film-based capacitors, designers now have an increasing array of high-energy-density ceramic capacitors available to them. In addition to the small signal …
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Voltage-Offset Resistive Control for Photovoltaics
This thesis introduces voltage-offset resistive control (VRC) for photovoltaic (PV) applications that exhibits low sensitivity to solar irradiance changes. Although there are numerous control schemes and maximum power point tracking (MPPT) methods for PVs, few focus on maintaining low sensitivity …
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Toward high-efficiency high power density single-phase DC-AC and AC-DC power conversion - architecture, topology and control
… portability. Therefore, new AC-DC and DC-AC converter designs that improve the efficiency and power density of the system is a critical area of research and is the focus of this dissertation. The recent development of wide band-gap devices stimulates a new round of improvement on efficiency …
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Bi-Directional AC-DC Converters for Electric Vehicles
… handle a wide range of active and reactive power control. Single-stage power conversion is chosen due to lower component count, better efficiency and higher power density. All power converter topologies proposed in this thesis are operated under zero voltage switching (ZVS). In proposed converter …
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