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 26 for “"Stability Region"”.
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Decentralized power systems : reference-frame theory and stability region generation
… Secondly, we introduce a framework for producing regions of stability for power systems using conditional generative adversarial neural networks. This provides transmission and distribution operators with an accurate set of control options even as the system changes significantly.
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Local network coding on packet erasure channels -- From Shannon capacity to stability region
… part, we characterize the full Shannon capacity region of the "COPE" principle when applied to a 2-flow wireless butterfly network with broadcast packet erasure channels. The capacity results allow for random overhearing probabilities, arbitrary scheduling policies, network-wide channel state …
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Scheduling algorithms for throughput maximization in time-varying networks with reconfiguration delays
… the impacts of reconfiguration delays on system stability and delay, and propose scheduling algorithms that persist with service schedules for durations of time based on queue lengths to minimize negative impacts of reconfiguration delays. These algorithms provide throughput-optimality without …
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Geometric algorithms for input constrained systems with application to flight control.
… with the notions of the controllable and stability regions. The controllable region is defined as the set of states of an unstable dynamical system that can be stabilized by some realizable control action. This region is bounded due to input constraints and its size can serve as a …
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Characterizing The Response Of A Force Feedback Joystick
… control loop parameters of a PD controller, the stability region for this joystick was found. In addition further experiments were conducted to characterize the effects of control loop frequency, set position, and springs. Ultimately it was found that the system preforms significantly better at …
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Delay, stability, and resource tradeoffs in large distributed service systems
… performance of such systems (in terms of stability region and delay) and to propose optimal policies, with emphasis on the asymptotic regime when both the number of servers and the arrival rate are large.
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Microgrid as a Cyber-Physical System: Dynamics and Control
… parameters of the cyber system can result in instability of a microgrid system. Simplification of the networked control system model is needed to enhance the computational performance, making the analytical method practical for large-scale power systems. To reduce the emission of carbon dioxide …
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Response of nonlinear structures to deterministic and random excitations
… curves and this causes multi-valued regions for the mean-square responses. The multi-valuedness is responsible for a jump phenomenon. The results show that for some range of parameters, noise can expand the stability region of the mean response. As applications, we study the response …
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Stability of nanostructured : amorphous aluminum-manganese alloys
… without sacrificing ductility, but structural stability has always been an issue. In this work, bulk aluminum-manganese (Al-Mn) nanocrystalline alloys have been synthesized using room temperature ionic liquid electrodeposition, by which various nanostructures and dual-phase structures can be …
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Renewable Energy Integrated Power System Stability Assessment with Validated System Model Based on PMU Measurements
… significant role in power system operation and stability assessment with its numerous penetration expansion. This is not only brought by its uncertain power output and inverter-based equipment structures but also its operation characteristics like Low Voltage Ride Through (LVRT). It is thus …
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Dynamical System Representation and Analysis of Unsteady Flow and Fluid-Structure Interactions
… methodologies and assessment of their dynamic stability. In the first chapter, I present a new Lagrangian function to derive the equations of motion of unsteady point vortices. This representation is a reconciliation between Newtonian and Lagrangian mechanics yielding a new approach to model …
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Fundamental limits of random access in wireless networks
… the optimal throughput performance (maximum stability region) of centralized scheduling mechanisms. The throughput optimality however has been established for activation rules that are relatively sluggish, and may yield excessive queues and delays. More aggressive/persistent access schemes …
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Microrid operation strategy for improved recovery and inertial response after large disturbances
… a fault recovery strategy that expands the stability region of the system. In the second part, the proposed operation strategy is presented as a new control technique that allows energy to be extracted from the induction motors in the system to achieve an inertial response and provide …
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Nonstoichiometry of chalcocite in water-xanthate systems
… iii) sulfate and iv) destabilized sulfate. Stability regions for each copper sulfide were shown to be dependent on both the Cu/S ratio in the system and the sulfur oxidation state. E<sub>h</sub>-pH diagrams were also constructed for chalcocite oxidation to metastable copper sulfides, both …
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ΜΕΛΕΤΗ ΣΥΣΤΗΜΑΤΩΝ ΕΛΕΓΧΟΥ ΣΤΡΟΦΩΝ ΚΙΝΗΤΗΡΩΝ ΣΥΝΕΧΟΥΣ ΡΕΥΜΑΤΟΣ ΜΕ ΤΗΝ ΑΡΧΗ ΤΟΥ ΒΡΟΧΟΥ ΣΥΓΧΡΟΝΙΣΜΟΥ ΦΑΣΗΣ (PLL)
… PHASE COMPARATOR HAS A SMALL PRACTICAL STABILITY REGION CONSEQUENTLY THE OPERATION AT LOW SPEEDS IS RATHER IMPOSSIBLE. A NEW NONLINEAR MODEL IS PROPOSED FOR THE PHASE FREQUENCY-COMPARATOR BY MEANS OF WHICH ASYMPTOTIC STABILITY CRITERIA HAVE BEEN DERIVED. THE STABILITY CRITERIA ARE A …
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Modelling, optimisation and control of series supply chains and production processes
… parameter of the downstream node lies in the stability region. Finally, issues related to estimation schemes based on local historical data are discussed. The main results and conclusions are illustrated via numerous examples and simulations. An alternative model of the supply chain is also …
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Voltage Stability and Control in Autonomous Electric Power Systems with Variable Frequency
… various types of power electronic loads. The stability of these systems is a challenge due to the inherent nonlinearity of the circuits involved. Traditionally, the stability analysis in this type of power systems has been approached by means of small-signal methodology derived from the …
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Holomorphic chains on the projective line
… of holomorphic chains was introduced and their stability were defined by L. ´Alvarez-C´onsul and O. Garc´ıa-Prada. The moduli spaces of holomorphic chains were constructed using the Geometric Invariant Theory (GIT) by A. H. W. Schmitt. They studied holomorphic chains on a smooth algebraic curve …
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Policy robustness : robust stability of multiclass queueing networks
… This dissertation focuses on the robust stability of stochastic processing networks. We re-visit the global—relative to control policies—stability of multiclass queueing networks. In these, as is known, it is generally insufficient that the nominal utilization at each server is below …
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Utilization of Channel State Information in Transmission Control for Wireless Communication Networks
… We provide an exact characterization of the stability region of a network which consists of a source, a relay and a destination with random data arrivals to both the source and the relay. We derive the optimal value of the relaying parameter to maximize the stable throughput of the source for …
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