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 14 of 14 for “"Inertial response"”.
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Microrid operation strategy for improved recovery and inertial response after large disturbances
… units, they can provide a coordinated response to maximize their impact on the grid. Microgrids are inherently different from the larger grid. This thesis shows how by challenging the paradigm of constant frequency and voltage operation, a new strategy can be implemented to achieve an …
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On the Response of a Spherical Particle to Unsteady Flows at Finite Reynolds Numbers
… also investigated. In all cases considered, the inertial response time of the particle is the same as the Kolmogorov time scale of the freestream turbulence. Over the parameter range considered, turbulence is found to have a minor effect on the mean drag and lift forces on the particle. …
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Multiscale Simulations of Dynamics of Ferroelectric Domains
… to understand the dynamics of ferroelectric response at finite temperature. Despite the tremendous advance of computational power and the success of first-principles methods, large-scale simulations of dynamics in oxides at finite temperature can still only be performed using classical …
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System Frequency Support of Permanent Magnet Synchronous Generator-Based Wind Power Plant
… to analyze the motivations for incorporating the inertial response and frequency regulation of VSWT into the system frequency regulation. Besides, control classifications, fundamental control concepts and advanced control schemes implemented for auxiliary frequency support of individual WT or wind …
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The influence of the land-sea breeze on coastal upwelling systems
The land-sea breeze is resonant with the inertial response of the ocean at the critical latitude of 30° N/S, however its role in the physical and biogeochemical functioning of eastern boundary upwelling systems (EBUS) is often over-looked. Here, we present a series of 1D, 2D, and 3D numerical …
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Superglass Dynamics Of Solid Helium
… to measure the finely resolved time-dependent inertial response of this exotic quantum material, we constructed a vibrationallyisolated millikelvin cryostat with automated data acquisition and temperature control, and used a high-dynamic range DC-SQUID-based displacement sensor to detect its …
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Enabling wind turbine generators to participate in power grid frequency regulation for enhanced stability
… frequency in a way similar to the droop response of conventional generators. Output active power adjustment can be realized by both converter and pitch angle control in addition to inertial response of the wind turbine. This helps in maintaining instantaneous power balance as well as in …
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Virtual Inertia Emulation to Improve Dynamic Frequency Stability of Low Inertia Microgrids
… microgrid system. For dynamic frequency control, inertial response can be provided from the energy storage system (such as battery, ultra-capacitor, photovoltaic system, etc.), which is termed as virtual inertia. A virtual inertia can be defined as the combination of an energy storage system, a …
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Piled foundation dynamics: Considering inertial and underground railway excitation
… examines the vibration of piles due to (1) inertial excitation at the pile heads and (2) incident waves from underground railways. The latter excitation mechanism also considers the building superstructure above the foundation. The numerical models account for the dynamic motion in …
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Power System Frequency Control and Stability Analysis With Increasing Renewable Energy Penetration Level
… more significant. In this dissertation, the inertial control algorithms are investigated and analyzed for power electronics converter in a renewable energy generation unit. The concept and design of Virtual Synchronous Generator are comprehensively discussed, such that the small-signal …
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The dynamics and kinematics of the coastal boundary layer off Long Island
… influenced by bottom friction. Wind-related inertial currents were observed within the coastal boundary layer (CBL) under favorable meteorological and hydrographical conditions. The magnitude of these oscillations increases with distance from shore, and they display a very clear 180° phase …
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Modeling and integration of smart control strategies to improve large-scale pv system management and operation in a low inertia power grid
… parameter for grid stability and disturbance response, especially with the increasing presence of PV generation. By analyzing the system's dynamic response, this objective aims to identify the system's inertia level and its implications for PV integration, ensuring secure power grid operation. …
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An investigation of wind- and wave-driven dynamics in Antarctic sea ice from multiple types of buoy arrays
… our understanding of the dynamic nature and response of the MIZ sea ice to extra-tropical cyclones, at both the synoptic and sub-daily scales, as well as to waves propagating into the Antarctic ice cover. This was done using multiple types of buoy arrays, which were operational in different …
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Evaluating soil pressures on a deep foundation element due to liquefaction-induced lateral spreading
… foundations during earthquakes includes the inertial response of the foundation and superstructure system, and the kinematic forces induced by the lateral spreading ground. Both must be analyzed in practice to design a bridge foundation, or other foundation type, subject to seismic forces and …