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 10 of 10 for “"weak grid."”.
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Development of a power conditioner for a PMSG-based wind energy system integrated into a weak grid
… the high network impedance which characterizes a weak grid. This thesis aims to study similar scenarios where a permanent magnet synchronous generator (PMSG) based wind energy conversion system (WECS) is integrated into a weak AC grid. The system comprises of a machine-side (MSC) and a grid-side …
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Significance of battery energy storage systems in mitigating the challenges in weak grids
… experienced a number of challenges, including weaker grids, low inertia, system congestion and voltage and frequency instability. This thesis investigates the role of battery energy storage systems in mitigating some of these challenges. Battery Energy Storage Systems (BESSs) have proved …
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Energy Shaping Control for Stabilization of Interconnected Voltage Source Converters in Weakly-Connected AC Microgrid Systems
… applications across the United States, microgrids are being viewed as an avenue for achieving this goal. Various independent system operators and regional transmission operators such as Southwest Power Pool (SPP), Midcontinent System Operator (MISO), PJM Interconnection and Electric …
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Cyber-Resilient Control of Synchronous Condensers
… power systems leads to new challenges to grid stability in weak networks and creates heightened cybersecurity vulnerabilities due to the extensive reliance on information and communication technologies. This dissertation investigates and proposes methodologies to enhance the stability and …
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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
… 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, which interacts with the inverter …
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Unmasked equalities: An examination of mortuary practices and social complexity in the Levantine Natufian and Pre-pottery Neolithic
… return" societies and Douglas' (1970) "weak grid and group" societies. Increased standardization of burial practices in the Pre-pottery Neolithic, and greatly increased emphasis on skull removal and reburial, indicates a greater emphasis on ritual through which the body was a symbol of …
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Facilitating seamless transitions in flexible microgrids: A unified control systems framework for enabling multi-mode inverters
… of renewable energy sources into the power grid offers both opportunities and challenges for grid performance, stability, and reliability. Inverter-based microgrids offer a promising solution for the large-scale integration of renewable resources, which often come with a high degree of …
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Harmonic emissions assessment for common DC and AC electric vehicle charging station architectures
… Stations (FCS) are required. As these FCS are grid-connected, they are going to be a new non-linear load for the host utility, which will impact its Power Quality (PQ). In this thesis, Common DC and AC bus (CDCB and CACB) architectures for grid-connected FCS are examined. For both …
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Stability Analysis of Three-Phase AC Power Systems Based on Measured D-Q Frame Impedances
… negative incremental resistance is discovered in grid-tied inverters as a consequence of grid synchronization and current injection, where the bandwidth of the phase-locked loop determines the frequency range of the negative incremental resistance behavior, and the power rating of inverter …
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Ac-dc Bus-interface Bi-directional Converters in Renewable Energy Systems
… the impact of the unbalanced power from the ac grid, especially the single-phase grid, on the dc system operation is analyzed. Then, a simple ac-dc two-stage topology and an advanced digital control system is proposed with a detailed design procedure. The proposed converter system significantly …