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 18 of 18 for “"inverter control"”.
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Control Design of a Single-Phase DC/AC Inverter for PV Applications
<p>This thesis presents controller designs of a 2 kVA single-phase inverter for photovoltaic (PV) applications. The demand for better controller designs is constantly rising as the renewable energy market continues to rapidly grow. Some background research has been done on solar energy, PV inverter …
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A Unified Technique for Dynamic Modeling and Stability Analysis of Microgrid Systems
… of the system may be analyzed with respect to inverter control gains to assess small-signal stability. The proposed methodology is verified for large-signal transient study and small-signal stability analysis using dual and single-inverter microgrid systems, respectively. The presented method …
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Self-synchronized converter for fast synchronization between low voltage microgrid and inverter connection
… between single-phase microgrid and inverter in low voltage, which is based on virtual synchronous converter (VSCon) technique is been developed. This technique does not require any phase locked loop (PLL) circuit as an external control structure for the synchronization of the …
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High-Fidelity Power Injection From A Fuel Cell Onto A Variable-Frequency AC Power Bus
<p>Synchronization of DC-source fed inverters to AC power systems is essential to the integration of DC sources such as fuel cells, batteries, and photovoltaics. In many cases, a phase detector determines the angle of the system which is used in the inverter control for the synchronization; …
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Modeling and Stability analysis of proposed Wind Farm at Búrfell, Iceland
… This problem is resolved by using rectifier and inverter. Rectifier converts AC into DC. Rectifier also controls the amount of power extracted from the turbine. It is necessary to maintain the smooth operation of the turbine. Therefore, rectifier controller is used. Rectifier controller ensures …
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Voltage Regulation of Smart Grids using Machine Learning Tools
Smart inverters have been considered the 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 …
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Cybersecurity and Protection Strategies for Inverter-Based Resource Integration
… to ensure the reliability of power systems with inverter-based resources (IBR). Communication-based control techniques enhance the performance of IBR-dominated power systems, but they increase the risk of cyberattacks. Moreover, the unconventional fault behavior of IBRs can cause traditional …
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Modified Control for Single-Phase Fuel Cell Systems with Input Ripple Compensation and Improved Output Quality
… consist of a DC-DC converter stage and a DC-AC inverter stage. In a single-phase fuel cell system, the single-phase inverter introduces a second harmonic component in the current drawn from the fuel cell source. This low-frequency current ripple has been found to be detrimental to the …
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Modelling and optimisation of the dynamic performance of a reversible solid oxide fuel cell system for the grid intergration of renewables
… AC power networks requires power electronic inverters with appropriate controls to convert variable DC power into AC power. However it is commonly recognized that power electronic inverters have major impacts on the dynamic behaviour of the fuel cell system, and these effects are highly …
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Reinforcement Learning for the Cybersecurity of Grid-Forming and Grid-Following Inverters
… generation has increased the number of installed inverter-based resources (IBR) in the grid, introducing new challenges in IBR control and cybersecurity. IBRs receive their set point through the communication link, which may expose them to cyber threats. Previous work has developed various …
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Modeling and Analysis of Voltage Feasibility Problems for Cost-Effective Microgrids
… levels of PV integration and complexities in inverter control strategies.
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Improvement of Stability of a Grid-Connected Inverter with an LCL filter by Robust Strong Active Damping and Model Predictive Control
… development and implementation of robust control methods for a three-phase grid-connected voltage source inverter (VSI) accompanied by an inductive-capacitive-inductive (LCL) filter. A challenge of current control for the VSI is LCL filter resonance near to the control stability boundary, …
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A Novel Inverter Based Resource Control Strategy to Facilitate Utility-Scale Renewable Integration and Retain Existing Transmission Protection Infrastructure
… connected to the grid via power electronic inverters have a significantly different fault response than conventional synchronous generators. The existing protection infrastructure for the North American transmission network was not designed with the behavior of these Inverter Based Resources …
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Modulation and control strategies for multilevel five-phase open-end winding drives
… other advantages, solutions based on multilevel inverters and multiphase machines are considered in recent years. The open-end winding drives are an alternative approach for drives construction. This thesis investigates carrier based pulse width modulation schemes for five-phase open-end winding …
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Modelling, Design and Implementation of D-Q Control in Single-Phase Grid-Connected Inverters for Photovoltaic Systems used in Domestic Dwellings.
… focuses on the single-phase voltage-source inverter for use in photovoltaic (PV) electricity generating systems in both stand-alone and grid-tied applications. In many cases, developments in single-phase PV systems have followed developments in three-phase systems. Time-variant systems are …
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Entropy-based framework for combinatorial optimization problems and enabling the grid of the future
… part is concerned with robust and scalable control architecture for a network of paralleled converter/inverter systems (DC/AC microgrids). Combinatorial optimization problems arise in many applications in various forms in seemingly unrelated areas such as data compression, pattern …
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Control and optimization of modern power networks: hybrid AC/DC networks and inverter-based microgrids
… the power system, particularly in terms of its control and optimization. In this thesis, we will consider some of these challenges for the control and optimization of contemporary and future power systems, focussing especially on hybrid AC/DC networks and converter-based microgrids. Hybrid AC/DC …
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High-efficiency Transformerless PV Inverter Circuits
… have been quite a few new transformerless PV inverters topologies, which eliminate the traditional line frequency transformers to achieve lower cost and higher efficiency, and maintain lower leakage current as well. With an overview of the state-of-the-art transformerless PV inverters, a new …