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 32 for “"Low inertia"”.
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Investigation into the stability of low-inertia micro-grids
This work examines the stability of low inertia micro-grids (MGs). The lack of inertia in such power electronics dominated grid is a pressing matter that directly impacts its operation and stability. The investigated MG is formed by power electronics-based DC-AC converters; each of them is …
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Design architecture for dynamic low inertia multi DOF robotic manipulators
… for robotic designers interested in creating low inertia, high bandwidth, multi DOF robotic arms and hands capable of proprioceptive force feedback from the world. This thesis briefly outlines the physics that govern the dynamics of robotic manipulators. It further covers various actuators and …
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Virtual Inertia Emulation to Improve Dynamic Frequency Stability of Low Inertia Microgrids
<p>Due to low inertia and the intermittent nature of photovoltaic systems, dynamic frequency stability issues arise in microgrids with large photovoltaic systems. This limits the maximum amount of photovoltaic systems that can be penetrated in the microgrid. In order to increase the penetration of …
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An experimental study of frequency droop control in a low-inertia microgrid
… These microgrids are usually built using low-inertia generators that are portable and can easily adapt to a rapidly changing environment. Despite the benefits of low-inertia generation, the drawback is that large load steps can cause a system to become unstable, losing synchronism and …
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Methods to ensure the adequate primary frequency response of low inertia power systems
… and electronic load has resulted in systems with lower inertia and reduced governor response. The expected continuation of this decline motivates research on economical methods to ensure primary frequency response (PFR) adequacy and prevent frequency-related emergency actions. This dissertation …
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CONTROL METHODS FOR BESS POWER CONVERTERS AND FREQUENCY REGULATION IN A LOW INERTIA GRID
… to operate autonomously/islanded mode. The inertia of the islanded microgrid is very low and they are more vulnerable to frequency instability in the event of a sudden and large power mismatch. To address this issue, a battery energy storage system (BESS) is considered a suitable option due …
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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
… Control complexities heighten when system inertia decreases due to the absence of synchronous generators connected to the grid. System inertia is pivotal for power system stability during sudden imbalances in active power. Thus, reducing system inertia is a significant concern for ensuring …
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Modelling and control of a floating oscillating water column
… by modelling the turbine with both high and low inertia and applying three turbine control theories to the turbine using the full scale model. A single Maximum Power Point Tracking algorithm was applied to the low-inertia turbine, while both a fixed and dynamic control algorithm was applied …
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Changes to system inertia and the impact on frequency response requirements
… power landscape and associated reduction of inertia in the power system,introduces concerns about the assurance of frequency stability and the adequacy ofdynamic frequency responses at low inertia. In islanded power systems, like those ofIreland and Great Britain (GB), understanding the …
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Autonomous Autorotation of a Tilt-Rotor Aircraft Using Model Predictive Control
… and landing given a total power failure. With low inertia rotors and high disk loading of tilt rotor vehicles, this already difficult task becomes significantly more challenging. In this work, a model predictive controller is developed to autonomously maneuver and land a tilt rotor given …
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Microgrid as a Cyber-Physical System: Dynamics and Control
… also raises new issues for the power grid, e.g., low inertia, degraded power quality, and higher uncertainties. Power electronics technology is used for power conversion of renewable energy. As the level of penetration of renewable energy increases, the inverter-based resources (IBRs) are being …
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A Novel Magnetorheological Fluid Damper for a Small Spacecraft with Flexible Appendages
… disruptive to a small spacecraft with low inertia. Previous studies have examined minimizing the dynamic motion of flexible appendages via shaping control of the external torquers (attitude actuators), and damping the dynamic responses in various schemes.</p> <p>This thesis presents the …
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Rotary fast tool servo component design
… conflicting challenges, including maintaining low rotational inertia and high stiffness while providing an integrated tool height adjustment mechanism. A new, novel "double-diaphragm" actuator is developed, which provides sub-micrometer level tool height adjustment. This actuator enables the …
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Design and development of a 7 degree-of-freedom powered exoskeleton for the upper limb
… were incorporated into the design, leading to low inertia, high-stiffness links, and back-drivable transmissions with zero backlash. The design enables full glenohumeral, elbow, and wrist joint functionality. Potential applications of the exoskeleton as a wearable robot include: (1) a …
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Design and Control of a Cable-Driven Sectorial Rotary Actuator for Open-Loop Force Control
… controlled actuator. These properties include low inertia (6.53e-04 kgm^2), low perceived mass (0.102 kg), small torque resolution (3.84e-04 Nm), small position resolution (21.5 arcsec), and high bandwidth (300 Hz). Due to the efficient cable transmission the design is also backdrivable, …
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State estimation of a cheetah spine and tail using an inertial sensor network
… the tail was in fact light with a relatively low inertia value. Fur from the tail was used in wind tunnel experiments to determine the drag coefficient of a cheetah tail. No researchers have actively sought to track the motion of a cheetah's spine and tail during rapid manoeuvres via placing …
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Compensating for the effects of reduced synchronous inertia on frequency stability using virtual synchronous generators
… have provided frequency stability through their inertia and governor responses. As more renewable energy sources (RES), particularly wind and solar, are added to the grid, they displace synchronous generators. Many of these RES generators do not inherently contribute inertia to the system, so …
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Significance of battery energy storage systems in mitigating the challenges in weak grids
… 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 effective in …
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High-Fidelity Power Injection From A Fuel Cell Onto A Variable-Frequency AC Power Bus
… systems exist in isolated power systems with low inertia such as microgrids and ships, and on aircraft due to the main generators being directly coupled to the aircraft jet turbines. While the frequency in most isolated power systems may vary +/-15% from the nominal 50 or 60Hz, aircraft power …
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Vector controlled induction motor drive systems
… ac machines are robust, less expensive, and have low inertia rotors. The main disadvantage of the ac machines is the complexity in control and the cost of the related circuitry. With the advent of vector control, ac machines have overcome this disadvantage and are being employed in different …
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