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 19 of 19 for “"reactive power support"”.
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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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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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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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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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Modeling and Analysis of Voltage Feasibility Problems for Cost-Effective Microgrids
… requires rethinking and redesigning existing power grid infrastructures to accommodate the unique characteristics of these resources. This research focuses on modeling techniques which can assist in analyzing the feasibility of microgrid topologies. Microgrids have emerged as a flexible and …
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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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Distributed Algorithms for Voltage Control in Electrical Networks
… distributed energy resources to provide the reactive power support required to stabilize and control voltage in electric power systems. As the number of distributed energy resources continues to increase, traditional approaches to the design and control of distribution networks will no longer …
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Design and model: Intelligent solid-state current limiter to prevent sympathetic tripping problem on power and energy applications
… to test X. The results reveal that transferring power near the system voltage stability limit is a major cause of the Sympathetic Tripping Problem. Limiting fault current and using synchronous condensers for reactive power support were shown to solve the Sympathetic Tripping Problem.
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AC Optimal Power Flow for Physically and Economically Informed Grid Decarbonization
Current practices for power systems operations and planning rely on an approximate optimal power f low formulation known as DC Optimal Power Flow (DC OPF). Results from DC OPF are not implementable, requiring feasibility checks and adjustments from AC power flow analysis. Current methodologies do …
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Use of Battery Systems for VAR Support in Con Edison’s Distribution Network/Substation
… grid by providing multiple services including reactive power (VAR) support. This research will investigate the use of smart inverters to provide VAR support, assess the impact it has on the lifetime of a BESS and determine how the adverse effects (if any) can be mitigated/eliminated. To …
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Critical Evaluation of DC-Grid and Strong Grid-Forming Wind Generator Systems
… stability and material sustainability in wind power systems. This research addresses two critical issues: the declining grid strength due to inverter-based resource integration, and the dependency on rare-earth permanent magnets in wind generators. The research proposes and evaluates …
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Grid Strength Assessment Trough Q-V Modal Analysis and Maximum Loadability of a Wind-Dominated Power System Using P-Q Regions
… a promising future to substitute the traditional power plants. However, the deployment of these wind farms into the grid is not a panacea that does not pose any challenges to the grid operators. Keeping the power system voltage stable while considering the strength of the transmission grid is …
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Distributed and decentralized control of the power grid
… network devices is transforming the way the power system is operated and studied. The ability to provide real and reactive power support can be achieved at the end-user level. In this dissertation, a framework and algorithm to coordinate this type of end-user control are presented. The …
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Intelligent voltage dip mitigation in power networks with distributed generation
The need for ensuring good power quality (PQ) cannot be over-emphasized in electrical power system operation and management. PQ problem is associated with any electrical distribution and utilization system that experiences any voltage, current or frequency deviation from normal operation. In the …
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Switched-doubly-fed-machine drive for high power applications
… through variable-speed drives (VSD), which are power-electronic based converters with associated control operating as an interface between the electrical machine and the electrical source. These drives are not only critical in a wide range of applications including industrial processes, electric …
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Coordinated active power reduction strategy for voltage rise mitigation in LV distribution network
… customers, and the third party into the electric power system, most especially in the MV and LV distribution networks grew over the last decade due to the liberalization of the electricity market, rising energy demand, and increasing environmental concern. The distributed rooftop PV system …
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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 …