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 13 of 13 for “"Low voltage ride through"”.
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Low Voltage Ride-Through for Indirect Matrix Converter Based Open-End Winding Drives
… storage mechanism, which could be used for ride-through operations during fault conditions. In some applications like wind turbines, the presence of large capacitive and reactive components in the drive could be a drawback due to lesser reliability and increased weight. Hence, converters …
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Comparison of low voltage ride through capabilities of synchronous generator with STATCOM and DFIG based wind farms
… wind energy systems to enhance grid performance through fault ride-through capabilities, providing voltage control and power quality improvement etc. The goal of a Fault Ride Through (FRT) or Low Voltage Ride Through (LVRT) system is to enable a wind farm (WF) to withstand a severe voltage dip at …
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Large wind farm aggregation and model validation
… one equivalent single machine to study the load flow and stability? How well does the equivalent single machine capture the behavior of the large wind farm during a simulation study? 2. When a short circuit happens in a large wind farm, some wind turbines trip while others do not. What is 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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Mathematical Modelling of Grid Connected Fixed- Pitch Variable-Speed Permanent Magnet Synchronous Generators for Wind Turbines
… (SVPWM) inverter, and a model of the power grid voltage sag detection for low voltage ride through (LVRT). The rectifier is a 3-phase uncontrolled diode full-bridge circuit. The boost chopper circuit offers a direct current (DC) power supply with constant voltage for the inverter. Sampled signals …
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Renewable Energy Integrated Power System Stability Assessment with Validated System Model Based on PMU Measurements
… but also its operation characteristics like Low Voltage Ride Through (LVRT). It is thus necessary to take these characteristics into consideration and further to find more adaptive schemes to implement them for more effective analysis and safer power system operation. All the aforementioned …
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Studying the Impact of Solar Photovoltaic on Transient Stability of Power Systems using Direct Methods
The increasing penetration of inverter based renewable generation in the form of solar photo-voltaic (PV) or wind has introduced numerous operational challenges and uncertainties. Among these challenges, one of the major ones is the impact on the transient stability of the grid. On the other hand, …
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Toward Systematic Integration of Inverter-Based Resources in Electricity Markets
… separating fast local feedback control from slower self-dispatch and system-level market coordination. Existing integration methods for IBRs limit their control flexibility and completely restrict their market participation potential. Two common practices include treatment of IBRs as negative …
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Energy storage systems for wave energy converters and microgrids
… a thermal chamber and equipment programmed through the general purpose interface bus by Matlab. Application testing is carried out using time-compressed scaled-power profiles from the model to allow a comparison of lifetime degradation. Further applications of supercapacitors in offshore …
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Current source based wind energy conversion system
… and meet all grid requirements such as ac fault ride-through and power quality aspects at the point of common coupling. This thesis presents three different CSC based WECSs. The first WECS is based on a back-to-back dual pulse width modulated current source converter (BTB-DPWM-CSC) as an …
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A Framework for Assessing the Reliability of Wind Energy Conversion Systems
… in the simulation. The proposed framework allows a quantitative analysis of WECS designs; analysis of WECS control schemes, e.g., fault ride-through mechanisms; discovery of key parameters that influence overall WECS reliability; and computation of WECS reliability with respect to different …
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Reactive power compensation of fixed speed wind turbines using a hybrid wind turbine technology
… to its robustness, mechanical simplicity, and low production cost. Its major setback is the inability to compensate 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 …
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DFIG-Based Split-Shaft Wind Energy Conversion Systems
… research introduces a control technique that allows achieving MPPT in a narrow window of generator speed in an SS-WECS. Consequently, the size of the power converters is reduced significantly. The proposed configuration is investigated by analytical calculations and simulations to demonstrate …