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 27 for “"Grid-forming"”.
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Regenerative Electric Spring Based Grid Forming Inverter for Next-Generation Power Systems
… are evolving into power electronics-dominated grids. The reduction of synchronous generator-based inertia increases grid vulnerability to frequency and voltage fluctuations, requiring advanced control strategies to enhance stable and reliable operation under varying load and generation …
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Critical Evaluation of DC-Grid and Strong Grid-Forming Wind Generator Systems
… energy has intensified challenges related to grid 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 …
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Reinforcement Learning for the Cybersecurity of Grid-Forming and Grid-Following Inverters
… 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 techniques to detect and mitigate …
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Impact of Grid-Following and Grid-Forming DERs on Resilient Operation of Holonic Grid
… impact the resilience operation of a holonic grid. The holonic grid consists of two or more connected microgrids and /or provisional microgrids (PMGs). The type of the DER, i.e., grid-forming or grid-following, affects the operations of the holonic grid, particularly during the islanded mode. …
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Phase control of delta-connected single-phase grid-forming inverters for auxiliary signal injection
… source made up of single-phase droop-controlled grid forming inverters arranged in a delta configuration. We begin by deriving the simplified $dq$ model of a three-phase ($3\phi$) grid-forming inverter and discuss proper selection of inner-current loop and outer-voltage loop gains for stability. …
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Design and Evaluation of a Photovoltaic Inverter with Grid-Tracking and Grid-Forming Controls
… control scheme which offers an alternative grid-synchronization method to the conventional grid-tracking control scheme, which is based on the dq phase-locked-loop- (PLL-) oriented vector control. Synchronous machines inherently synchronize to the grid and largely partake in the …
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Synchronous Condensers and Grid-Forming Control for the Integration of Inverter-Based Resources in Weak Grids
… by leveraging synchronous condensers (SC) and grid-forming control. First, it presents an optimization model to find the optimal location and size of SCs, aiming to minimize the total cost of SCs and maintain the strength (measured by short-circuit ratio [SCR]) above a desired value at the …
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Innovative Systemic Control of Grid-Edge Inverters in Distribution Grids for Enhanced Grid Services
… that enhances the performance and resilience of grid-edge inverters. Specifically, it proposes an innovative systematic methodology to improve the grid services of grid-forming inverters, ensuring robust performance under complex grid conditions. This methodology demonstrates broad applicability …
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Transmission grid strength analysis and operation of inverter-based microgrids
… system strength and operation of microgrids with inverter-interfaced resources. The strength of the transmission grid with large wind farms is investigated based on the voltage phase angle stability. A novel approach for evaluating the strength of low-inertia systems that only relies on …
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Inverter-based Control to Enhance the Resiliency of a Distribution System
… in the integration of renewable energy to the grid, there is a critical need for varying the existing methods and techniques for grid operation. With increased renewable energy, mainly wind and photovoltaics, there is a reduction in inertia as the percentage of inverter-based resources is …
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Stacked-Switched Electrolytic Capacitor-less AC/DC Power Converters
… capable of interfacing directly with the AC grid. Conventional single-phase AC/DC converters often depend on bulky electrolytic capacitors, diode bridges, and hard-switching circuits, leading to reduced reliability, increased losses, and limited power density. Additionally, the need for …
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Control and stability of autonomous inverter-based microgrids
… to facilitate this change are autonomous microgrids, which allow renewable powered systems to operate independent of the fossil-fuelled power grids. To achieve this, inverters must have grid-forming capabilities, operate in a synchronised manner and share power optimally. However, the absence …
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Modeling, simulation, and control design of electro-mechanical dynamics in heterogeneous power systems
… power systems with synchronous generators and grid forming inverters with droop control, virtual synchronous machine control, and dispatchable virtual oscillator control is developed. To mitigate model complexity and facilitate analytical understanding, this framework employs reduced-order …
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Toward Intelligent Power Systems: 5G-Enabled Hybrid Control of Distributed Energy Resources in Microgrids and Virtual Power Plants
… of a hybrid control framework for Micro-Grids (MGs) and Virtual Power Plants (VPPs), leveraging 5G cellular networks for real-time supervisory communication. The research fo-cuses on the coordinated operation of Grid Forming Inverter (GFMI) and Grid Following Inverters (GFLIs), enabling …
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DQ-Frame Small-Signal Stability Analysis of AC Systems with Single-Phase and Three-Phase Converters
… of power converters in applications such as microgrids and data centers has introduced significant stability challenges. This dissertation presents a novel approach to modeling and comprehensive stability analysis for both single-phase and three-phase converters, addressing vital gaps in the …
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Vector Based Control for Power Electronics Dominated AC Power Grid
The global trend towards electrifying the grid has positioned power electronics at the forefront of modern power systems. To control power electronics in grid-connected applications, Grid Forming (GFM) control has become a focal point of research. GFM control utilizes control laws derived from …
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Power Grid Partitioning and Monitoring Methods for Improving Resilience
… to develop decision-making tools that aid power grid operators in mitigating extreme events. Two distinct areas are focused on: a) improving grid performance after a severe disturbance, and b) enhancing grid monitoring to facilitate timely preventive actions. The first part of the dissertation …
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Dynamic Modeling and Real-time Simulation of Power Electronics-dominated Power Grids Using Hybrid DDM and EDDM Techniques
… differential algebraic equations. As modern grids grow in size and complexity, traditional sequential simulation methods have become increasingly computationally challenging and time-consuming. This research investigates parallelism techniques from both an innovative algorithmic perspective …
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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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Communication framework for a self-organized ad hoc microgrid, A
… energy resources (DER) can assist the grid during these outages by providing localized supply of power. This is possible through creating a Microgrid that can island from the affected power grid and form its own network. However, due to the uncertain and often abrupt nature of weather …
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