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 9 of 9 for “"Voltage sags"”.
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On-line Dynamic Security Assessment in Power Systems.
… in synchronism, it is also required that the bus voltages remain within acceptable limits. A transient disturbance and the following angular divergence of a group of generators can cause critical voltage sags at certain buses in the system. In this thesis assessment of such voltage sags is …
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Analyzing voltage sag direction using protective relays and deep-learning methods
… to study methods of identifying the direction of voltage sags in the distribution circuits. Voltage sags arise from the presence of short-circuit faults involving single, double, and three phase-to-ground conditions. The direction of the fault is based on the direction of power flow before the …
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Modeling of industrial power distribution circuits for voltage sag and fault analysis
… to simulate sensitive electrical loads during voltage sags. The study begins by discussing the modeling procedure for induction motors based on manufacturer datasheets. It then investigates and develops a 24-pulse variable frequency drive (VFD) model in EMTP. The functionality of the VFD model …
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Modeling and Analysis of a Dynamic Voltage Regulator
… often highly variable, resulting in undesirable voltage disruptions that are harmful to sensitive loads. In addition to the energy variability of renewable energy sources, random voltage sags, swells and disruptions are already a major issue in power systems. Recent advances in power electronic …
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Islanding Detection and Cybersecurity in Inverter-Based Microgrids Under a High-Noise Environment
… Islanding can result in frequency and voltage instability, changes in current, and overall poor power quality. Poor power quality can interrupt industrial operations, damage sensitive electrical equipment, and induce outages upon the resynchronization of the island with the grid. This …
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Risk Management of Cascading Failure in Composite Reliability of a Deregulated Power System with Microgrids
… short-circuits induced by overgrown vegetation, voltage sags, line and transformer overloading, transient instabilities, voltage collapse, to cite a few. How to control the economic losses of blackouts is gaining a lot of attention among power researchers. In this research work, we develop new …
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Intelligent distribution fault location using voltage magnitude measurements
… These sensors allow the capture of fast-sampled voltage data such as frequency, voltage magnitude, and voltage angle measurements in a low-cost, easily deployable manner. Traditional fault location methods use both current and voltage data. Voltage monitoring devices only collect voltage data, …
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Low Voltage Ride-Through for Indirect Matrix Converter Based Open-End Winding Drives
… a niche product. High frequency common mode voltage (CMV) switching is a by-product of the ASDs operating at medium to high frequencies and cause bearing currents to flow, which damage the machine and reduce their lifetime. Elimination or reduction of common mode voltage is a well-researched …
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Reactive power compensation of fixed speed wind turbines using a hybrid wind turbine technology
… for its reactive power need and improve voltage stability during a fault condition. In steady-state conditions, these WTs experience large fluctuations in the generator terminal voltage because of uncontrolled consumption of reactive power. During grid fault conditions, the FSWT consumes …