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 40 for “"load models"”.
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On Verification of Load Models for Frequency Response Using PMU Data
… to the frequency deviation. Most electric loads are sensitive to large variations in frequency that change their power consumption as a result. Therefore, load modeling is a crucial element in power system simulation, and a better understanding of load response in frequency excursion events …
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Load models for technical, economic and tariff analysis of medium voltage feeders
Load models play an essential role in many studies, including calculating voltage drops and technical losses in distribution systems, for distributed generator (DG) integration planning, and in tariff analysis and design models. The Herman-Beta transform used in the low voltage network modelling …
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Analysis and comparison of the South African and Eurocode live load models for railway bridges
… Transport Services (SATS) and Eurocode (EC) live load models for railway bridges. The study is specifically concerned with the critical load effects of shear and bending moment. The load models are simulated as moving loads over the full length of simply supported and continuous railway systems …
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Review of South African live load models for traffic loading on bridge and culvert structures using weigh-in-motion (WIM) data
… weigh-in-motion (WIM) sensors to calculate the load effects on single lane, simply supported structures spanning up to 30m. The main objective was to compare the load effects caused by the recorded vehicles with those calculated using TMH7 Part 2 and the alternative live load models proposed in …
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Network and Load Modeling for Power System Dynamic Analysis
… thesis involves the development of network and load models for power system analysis. Traditional power system models consist of detailed generator models and simple network and load models. In the past this has been acceptable as these models captured observed phenomena. These models do not …
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A critical review of the current design guidelines for footbridges: with emphasis on the design for jogging forces
… in the range of pedestrian-induced dynamic loading from activities such as walking, running and jogging. This has lead to a number of recent footbridges suffering from excessive vertical or lateral vibrations necessitating retrofitting, usually at high additional costs ((Butz, 2008; Sun and …
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Probabilistic models for blast parameters and fragility estimates of steel columns subject to blast loads
… probabilities of steel columns subject to blast loads. The framework considers the uncertainties in the blast phenomenon, the demands imposed on the column, and the capacities of the column for the limit states of flexure, local buckling and global buckling. As part of the work, we propose four …
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An investigation into the effects of load modeling of transient stability and analysis of voltage collapse
… of this thesis is to investigate the effects of load modeling on transient stability studies and to analyze the phenomenon of voltage collapse. In addition, the different generator models are compared and the effects of voltage dips on induction motor performance are investigated. The modeling of …
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Identification of Vulnerable Zones on Steel Railway Bridges
… of these bridges were performed using different load models; static forces, series of moving forces, and series of moving single mass. The research was to identify the hotspots on the 3 steel railway bridges i.e. crocodile, Kalbaskraal, and Van Stadens by determining the static and dynamic …
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Robust Optimal Control of Step Motors by Lead Angle Selection (Incremental Motion)
… portions of a move is presented. Motor and load models for dynamic characterization are discussed, along with variable observers and parameter identifiers.
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High speed dynamic simulation of power systems
… the classical model of a generator, with linear load models, is considered.
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Statistical analysis of the vertical human walking forces and human structural interaction effects
… Recent research concludes that industry load models incorporate inherent bias through the limited intra-subject variation and poor correlation with actual walking loads. Current guidance pertaining to the vibration serviceability assessment does not disclose or encourage human structure …
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Dynamic load modeling in power system analysis
… induction machine modeling and polynomial static load modeling on the stability of electric power systems and to compare the results with those obtained using constant impedance or constant current load models. A least-squares curve fit algorithm is developed and used in modeling static and …
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Load Modeling using Synchrophasor Data for Improved Contingency Analysis
… for energy and the growing complexity of the loads are two of the main challenges faced by the power grid. In order to prepare for contingencies and maintain a secure state, power engineers must perform simulations using steady state and dynamic models of the system. The results from the …
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Incorporating time and statistical variations in load modelling for reliability and customer interruption costs evaluations
… Firstly to investigate different types of load modelling in reliability or CIC [customer interruption costs] evaluations to obtain an understanding on how these evaluations are performed and identifying the benefits or limitations of existing models. Secondly to develop several load …
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Effects of disparate information levels on bridge management and safety
… not fail in its function; i.e. to resist the loads/actions to which it is subjected to. The structural reliability method provides for the computation of structural safety by accounting for probabilistically uncertain load models and uncertainties around the return period of extreme load …
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Power System Reliability Analysis with Distributed Generators
… calculations have been performed for static load models and inherently make the assumption that system reliability is independent of load. The study presented here evaluates improvement in reliability over a time varying load curve. Reliability indices for load points and the overall system …
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Dynamic-Data Driven Real-Time Identification for Electric Power Systems
… three areas: Developing accurate dynamic load models and updating variable parameters based on the measurement data, applying advanced nonlinear filtering concepts and technologies to real-time identification of power system models, and addressing computational issues by implementing the …
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Applications of phasor measurements to the real-time monitoring of a power system
… on using constant admittance or constant current load models. These models are accurate for a small neighborhood around the operating point when they were calculated. To determine the maximum error expected for any given system estimate, an equation relating the maximum error in the voltages to …
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