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 198 for “"Reactive power"”.
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Voltage and Reactive Power Control in Islanded Microgrids
… generation (DG) units to maintain equal reactive power sharing in a distribution system; 2) The ability of the DG units to maintain acceptable voltage boundary in the entire IMG; 3) The functionality of the existing voltage and reactive power (Volt/Var) DG, this thesis analyzes the …
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Microgrid-Enabled Reactive Power Support to Enhance Grid Economics
<p>Reactive power plays an essential role in voltage control and stability in electric power systems. Various Volt/VAR techniques are utilized in electric power systems to maintain the voltage profile within defined acceptable limits and accordingly provide reliability and stability. Reactive power …
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Optimal allocation of reactive power to mitigate fault delayed voltage recovery
The Masters Thesis research focuses on reactive power and voltage control during and following major power system disturbances such as faults and subsequent loss of transmission line(s) or generator(s), voltage recovery phenomena following successful fault clearing, dynamic swings of power systems …
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Reactive power potential: A contribution of hydropower for the Energy Transition
… <br/>time, the gradual phase-out of conventional power plants presents significant <br/>challenges for the electricity grid, especially in terms of expanding the network and <br/>ensuring its reliability. <br/>This study explores the critical role of hydropower plants in stabilizing the energy …
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A STUDY OF ACTIVE FILTERS FOR HARMONIC AND REACTIVE POWER COMPENSATION
In this thesis, several aspects of an Active Power Filter (APF) system are studied. The theoretical background of active power filtering is evaluated, including several methods of harmonic current extraction, analysis of the shape of the de-link voltage of the APF and its response to external …
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Consensus-Based Active and Reactive Power Control and Management of Microgrids
… efficiency, reduced emissions, and improved power quality. Their success hinges on cost reductions in renewables, storage, reliability, and energy management systems, enabling operation both with and without the utility grid.</p> <p>Economic Dispatch optimizes system costs, considering all …
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Reliability analysis of single-phase photovoltaic inverters with reactive power support
Reactive power support is expected to be an emerging ancillary requirement for single-phase photovoltaic (PV) inverters. This work assesses related reliability issues and focuses on the second stage or inversion process in PV inverters. Three PV inverter topologies are analyzed and their …
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Reactive power support capability of flyback microinverter with pseudo-dc link
… been used for injecting only active power in to the power distribution network. In this thesis, a new approach will be proposed to control the micro-inverter to supply reactive power to the grid which is important for grid voltage support. Circuit models and mathematical analyses are …
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Designing Reactive Power Control Rules for Smart Inverters using Machine Learning
Due to increasing penetration of solar power generation, distribution grids are facing a number of challenges. Frequent reverse active power flows can result in rapid fluctuations in voltage magnitudes. However, with the revised IEEE 1547 standard, smart inverters can actively control their …
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Grid Tie Inverter in a Distributed Generation System with Reactive Power Capabilities
… presents a single phase grid tie inverter with reactive power controller for renewable energy applications in a distributed generation system (DGS). This allows the local renewable energy sources in the DGS to provide the necessary reactive power support to the grid. The inverter utilizes a …
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Smart-grid-enabled distributed reactive power support with conservation of voltage reduction
… energy continues to increase in the current power grid, the reactive power support capability from photovoltaic grid-tie inverters may be used to regulate feeder voltage and reduce system losses on medium- and low-voltage distribution systems. The focus of this thesis is to develop a …
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Value of distribution-level reactive power for combined heat and power systems
… level. One type of ancillary service - reactive power - is of particular interest because of the theoretic ability to source from existing assets on the distribution network. This paper aims to build understanding of the value of procuring reactive power from one of these assets: …
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The utilization of power converters in consumer products for distributed reactive power support
… which can be used to improve the nation's power grid. The motivation of this research lies in the use of emerging smart grid devices to supply reactive power as a means of distributed reactive power support. Such devices can include plug-in hybrid electric vehicles, solar panels, …
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Design of a single-phase grid tied inverter optimized for reactive power support
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2022-11-11 without embargo terms
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Reactive power compensation of fixed speed wind turbines using a hybrid wind turbine technology
… the integration of wind energy into an existing power system grid can lead to increased exposure to instability. This has prompted power systems operators to revise the connection requirements for grid codes that require wind turbine generators to contribute to power control and stay online …
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Load Flow Study for Utility-Scale Wind Farm Economic Operation and Reactive Power Grid Compliance
… that are paralleled and connected to inject power to one location on the transmission grid. There are real power losses and reactive power drops that must be taken into consideration for these projects for plant performance and compliance. The better the performance of each new and operating …
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Reactive power compensation, system and voltage stability of an industrial network with short circuit limiting coupler
… Sasol Three (Secunda) system's needs for reactive power compensation under voltage and transient stability conditions. A short circuit limiting coupler is designed and the transient and voltage stability studies are performed with a short circuit limiting coupler (SLC) applied at the two …
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A Wide Range and Precise Active and Reactive Power Flow Controller for Fuel Cell Power Conditioning Systems
… its impact and maximize feasibility of the power conditioning system in distributed generations. Because the grid voltage is constantly changing, the inverter must be able to response to it. If the inverter is unable to respond properly, then the grid voltage power comes back to the system …
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