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 37 for “"Ride-Through"”.
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Víceúrovňový měnič s aktivními hradlovými budiči pro Fault Ride-Through
Tato práce se zabývá víceúrovňovými měniči, popisuje jejich výhody a současné/potenciální budoucí aplikace. Zaměřuje se na „Nested Neutral Point Piloted (NNPP)“ topologii a vývoj algoritmu řízení s aktivním vyrovnáváním napětí kondenzátoru a pokročilou vektorovou modulací pro tuto topologii. Tento …
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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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Performance Assessment and Management of Large Wind Farms under Abnormal Grid Operating Conditions
… used in this thesis to develop methodology for ride-through criteria. During abnormal operations, ride-through requirement is prerequisite to handle large grid disturbance. Network characteristics and their interaction with available wind technologies also impact dynamic behaviour. One of the …
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Large wind farm aggregation and model validation
… 3. Is there any way to improve the low voltage ride‐through of a large wind farm using intelligent devices to control the impact of a short circuit? The study is conducted using the General Electric GE doubly fed induction generator wind turbine modeled in the PowerWorld Simulator. Through this …
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Analysis in circuit breaker performance requirements for high-voltage DC networks
… circuit breaker topologies can effect the fault ride-through of the network. Fault detection and discrimination algorithms are implemented to ensure accurate representation of the time overhead this incurs. It is shown that the variation between slower, cheaper circuit breakers and faster, more …
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Distributed Energy Storage Systems: Microgrid Application, Market-Based Optimal Operation and Harmonic Analysis
… between batteries and flywheels for the ride-through application in critical microgrid facilities like data centers. In comparison with batteries, the application of FES for power security is new. This limits the availability of experimental data. The software tool developed in this …
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Cybersecurity and Protection Strategies for Inverter-Based Resource Integration
… is developed based on the standardized fault ride through (FRT) behavior of IBRs and the steady state behavior of IBR controllers. To enable the algorithms to be validated on realistic communication and protection devices, a real-time simulation model of a generic IBR controller is developed.
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Modeling of industrial power distribution circuits for voltage sag and fault analysis
… thoroughly discussed. Furthermore, a low-voltage ride-through (LVRT) model is designed to replicate the operational behavior of the VFDs being studied. The induction motor model is validated, with steady-state simulation and direct-line starting being documented in this thesis. The study …
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Resilience and Cybersecurity for Distribution Systems with Distributed Energy Resources
… loads. The DERs comply with IEEE disturbance ride-through requirements and switching transients are maintained within acceptable limits. A comprehensive DER-based resiliency plan is developed and validated for the Virginia Tech smart grid.
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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
… 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 grid codes/performance requirements.
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Residential Microgrids for Disaster Recovery Operations
… service and also the potential of microgrids to ride through these interruptions. Microgrids can be used before, during, and after a major natural disaster to supply electricity, after the main grid source has been interrupted. This thesis researches the potential of clean energy microgrids for …
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The City Is a Morgue
… "Kitty Litter," the most realistic piece, is a ride through the underworld of the methamphetamine business in a Midwestern college town. Each facet of the miniature drug ring is visited as the protagonist strives to regain a large amount of stolen merchandise for his boss. "The City Is a …
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Mathematical Modelling of Grid Connected Fixed- Pitch Variable-Speed Permanent Magnet Synchronous Generators for Wind Turbines
… 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 of instantaneous 3-phase voltage …
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Highly Efficient Gan-Based Single-Phase Transformer-Less Pv Grid-Tied Inverter
… investigates the impact of emerging Gallium Nitride (GaN)-based power devices on a single-phase transformer-less inverter in terms of efficiency, high switching frequency capability, volume and cooling efforts. GaN device structure, as well as static and dynamic characterization, are …
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Stability impact of increased DER penetration in regard to the IEEE 1547 standard in the presence of cyberadversaries
… multiple DER could be attacked simultaneously. Through several illustrative use cases, this thesis addresses in detail how potentially adverse combinations of mode change, mode setting parameters, and ride-through and tripping settings could lead to instability. The use cases are then validated …
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DC Fault Current Analysis and Control for Modular Multilevel Converters
… Fast fault current clearing and fault ride-through capability are achieved.
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Renewable Energy Integrated Power System Stability Assessment with Validated System Model Based on PMU Measurements
… 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 is based on …
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Control and operation of HVDC connected offshore windfarm with particular emphasis on faults and black start
… windfarm systems and proposes several fault rides through control and system recovery schemes.;The first topic discussed in this thesis is the offshore AC fault ride through operation. When modular multilevel converter (MMC) based HVDC connection is used for offshore windfarm system, the …
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