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 25 for “"Load Change"”.
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Large signal transient analysis of duty ratio controlled DC-to-DC converter
… interest including start-up, step input voltage change and step-load change are analyzed. The effect of large-signal characteristics of the feedback controller on the transient trajectory is presented.
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Islanded Operation of Parallel Inverter-interfaced Microgrids with Photovoltaic Systems
… in this dissertation is to distribute the load change among intermittent distributed generators according to their power ratings. A linearized model of microgrids is used to evaluate the change in powers (real-reactive) of the distributed generators due to the load change, but it is noticed …
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Reinforcement Learning for the Cybersecurity of Grid-Forming and Grid-Following Inverters
… under grid normal transients, such as set point change, load change, and short-circuit fault, to make sure the proposed detection method does not provide false positives.
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Photovoltaic Emulator Adaptable to Irradiance, Temperature and Panel Specific I-V Curves
… panel model, irradiance and temperature. When a load change occurs, the power supply changes its current and voltage to track the calculated I-V curve, so as to mimic a solar panel. Over 250 different solar panels at varying irradiances and temperatures are able to be accurately emulated. A PV …
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Control Strategy for a Small-Scale Microgrid Based on Battery Energy Storage System-Virtual Synchronous Generator (bess-Vsg)
… a fluctuation in the PV power generation and/or load change, leading to higher stability and robustness.</p> <p>This thesis focuses on the modeling and control of the PV and BESS-VSG system, and the proposed modeling and control method are verified in MATLAB/Simulink.</p>
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Analysis and Design of Phase Lock Loop Based Islanding Detection Methods
… and the possibility of a false trip caused by a load step. Multiple methods in parallel are possible because the islanding detection method is patentable, so each grid interface inverter company is likely to implement a different islanding detection method. The load step represents a load change …
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Dynamic response of the supercritical C0₂ Brayton recompression cycle to various system transients
… Transient behavior of the printed circuit heat exchangers is determined via the previously developed code HXMOD. Turbomachinery performance is modeled using the Real Gas Radial Compressor (RGRC) code with a scaling scheme for off-design conditions. Currently, TSCYCO has the capability of modeling …
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Vehicle to grid (V2G) for reliable microgrid operation: Voltage/frequency regulation and real-time OPAL-RT digital simulation
… fast-tracking either under a temporary fault, load change, connections, and disconnections or a sudden change in PV’s power production. This Thesis details the designs and modeling of a Home with a particular load profile. Simulink of Matlab is chosen as the simulation tool based on the ability …
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INTERAREA OSCILLATION DAMPING BY USING A PERMANENT MAGNET SYNCHRONOUS GENERATOR WIND TURBINE
… which are caused by the wind speed or load change. This research develops a procedure for design an auxiliary feedback control to damp the inter-area oscillations. This dissertation investigates the use of the permanent magnet wind generator as a means for damping dynamic inter-area …
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Development of a digital twin for demo cooling system
… the pump inlet and substantially higher varying loads. Furthermore, for redundancy, the systems now need to have multiple plants in parallel. To address challenges pertaining to scaling, the systems now have novel design elements such as the addition of the surface storage, flow-through mode for …
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Control scheme for cathode airflow during load swings in a solid oxide fuel cell/gas turbine system
… manipulation of bypass valves and the electric load on the generator. The work is preparatory to the development of a Multi-Input, Multi-Output (MIMO) controller for HyPer. A factorial design of experiments was conducted to acquire data for 81 different combinations of the manipulated variables, …
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Power sharing strategy using H∞ controller between two distributed generation sources in islanded mode
… techniques are commonly used for sharing loads. However, this non-communication power sharing control technique has a disadvantage, where the frequency and voltage deviations are severe during a sudden load change. Currently, it can be fixed by using the communication-based secondary …
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Smart grid analysis with particular references to power quality and load forecast
… was designed more than 50 years ago when the load and generation was less, now we are in the information age with a digital society where the demand is very high, this has forced the electricity infrastructure to its limits which was not designed for, in addition, the electricity demand …
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Dynamic modelling of SOFC marine power systems and shipboard applications
… SOFC systems at both static and dynamic working loads. A mathematical model is developed for describing the thermodynamic nature of a tubular SOFC concerning the thermal equilibrium of the system. Electric-chemical reactions are reflected in the stack modelling. Reforming reactions of the fuel …
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Intelligent energy management system - techniques and methods
… is operating on the limit, aging equipments, load change etc, therefore an improvement is essential to minimize these problems. To enhance the current system and resolve the issues that it is facing, smart grid has been proposed as a solution to resolve power problems and to prevent future …
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New techniques for the analysis of flexible operation of gas turbine based systems
… Power Plants (CCPP) now operate with frequent load changes to fill the gaps in supply by participating in the balancing market. Substantial efforts to develop innovative solutions to the new challenges are invested by the commercial and research community, where investigation into improving …
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Modeling process dynamics in membrane-electrolyte-assemblies of chloralkali electrolyzers considering steric and hydration effects
… mechanism during the ramp up and the ramp down load change are also predicted during the ramp input simulation. The simulations also show that the charged double layer in the vicinity of the solution-membrane interfaces plays an essential role in shaping the transient. The diffusion coefficient …
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Load-Independent Class-E Power Conversion
… induction heating, and plasma pulsing. The load current in these applications usually varies over a range. Efficiency of a conventional Class-E design degrades dramatically due to the hard switching beyond the optimum conditions. Keeping ZVS with load change in a Class-E topology is …
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A Two-Phase Buck Converter with Optimum Phase Selection for Low Power Applications
… the power converter efficiency for light load, while being able to manage heavy load. The power stage of traditional buck converter is optimized for maximum load, at the cost of light-load efficiency. Wei proposed a multiphase buck converter incorporating the baby-buck concept and optimum …
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Vereinfachte Methoden zur optimalen Regelung resonanter Leistungskonverter
… power supplies. Several control methods for a load resonant converter focusing on class-E topology utilizing PT, were developed in order to investigate and to select an appropriate control method capable of improving the efficiency and reducing the size of the converter. Efficiency should be …
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