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 26 for “"Reactive Power Control"”.
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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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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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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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Direct Power Control of AC Motors
In this thesis, the possibilities of direct power control (DPC) of induction motors (IMs) and permanent magnet synchronous motors (PMSMs) fed by a voltage source inverter have been studied. Three different approaches of DPC for IMs and one for PMSMs are proposed and investigated. They are: (a) …
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Voltage Regulation of Smart Grids using Machine Learning Tools
… primary fast solution for voltage regulation in power distribution systems. Optimizing the coordination between inverters can be computationally challenging. Reactive power control using fixed local rules have been shown to be subpar. Here, nonlinear inverter control rules are proposed by …
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D-Q Frame Impedance Based Small-signal Stability Analysis of PV Inverters in Distribution Grids
With development of renewable energies worldwide, power system is seeing higher penetration of Utility-scale photovoltaic (PV) farms at distributed level as well as transmission level. Power electronics converters present negative incremental impedance characteristics at their input while under …
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Increasing Distribution Grid Hosting Capacity Through Wire And Non-Wire Solutions
… This increment can potentially change network power flow and result in several operational issues such as reduced power quality, overvoltage, and ineffective protection. In order to quantify the degradation bounds of distribution operation due to increasing DG integration, the concept of …
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Impact assessment of large-scale penetration of permanent magnet synchronous generators on power quality
Wind power generation has gained a large share in the renewable energy market over the past few years. This study investigates the impact of large scale penetration of permanent magnet synchronous generator (PMSG) based wind turbines on power quality of the grid. PMSGs are attractive due to the …
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Development of a DFIG wind energy system for grid integration studies
… Generators (DFIGs) are common for use in wind power generation. This can be attributed to factors such as the variable speed operation of the rotor, which can be adjusted through control systems with varying wind speed, ensuring more efficient power conversion.The stator windings in a DFIG are …
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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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Implementation of Adaptive Protection Scheme for Microgrid using IEC 61850 Communication Protocol
The existing electrical power system is experiencing radical changes in parallel with the growing integration of Distributed Energy Resources (DER) such as Photovoltaic (PV), Wind Turbine Generators, Fuel Cell etc. DERs with locally connected loads create subsystems within the main grid which are …
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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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Excitation and control of a high-speed induction generator
… speed, squirrel cage induction generator and power converter for producing DC electrical power onboard ships and submarines. Potential advantages of high speed induction generators include smaller size and weight, increased durability, and decreased cost and maintenance. Unfortunately, …
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Bi-Directional AC-DC Converters for Electric Vehicles
… reliability, cost and efficiency. Meeting power quality standards imposed by grid and operation with wide range of DC voltage and current are among the other requirements. In addition, EV battery chargers can be used for ancillary services and also feed the power back to the grid in peak …
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Control and operation of offshore wind farms connected with diode rectifier HVDC systems
… To reduce the cost related to offshore wind power integration, this thesis investigates the control, modelling and operation of offshore wind farms connected with diode rectifier HVDC (DR-HVDC) systems, where a diode rectifier is used offshore and a modular multilevel converter (MMC) is used …
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Generalized Average-Current-Mode Control of Single-Phase AC-DC Boost Converters with Power Factor Correction
… presents a generalized average-current-mode control technique (GACMC), which is an extension of the average-current-mode control (ACMC) for single-phase ac-dc boost converters with power factor correction (PFC). Traditional ACMC is generalized in a sense that it offers improved performance in …
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Dynamic Analysis and Control of Multi-machine Power System with Microgrids: A Koopman Mode Analysis Approach
Electric power systems are undergoing significant changes with the deployment of large-scale wind and solar plants connected to the transmission system and small-scale Distributed Energy Resources (DERs) and microgrids connected to the distribution system, making the latter an active system. A …
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Highly Efficient Gan-Based Single-Phase Transformer-Less Pv Grid-Tied Inverter
… of a PV system that needs to be improved is the power converter. Grid-tied transformer-less inverters have gained a lot of interest in recent years because of their higher efficiency, reduced volume and lower cost compared to traditional line transformer inverters.</p> <p>This dissertation …
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