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 16 of 16 for “"Fault 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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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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Cybersecurity and Protection Strategies for Inverter-Based Resource Integration
… of cyberattacks. Moreover, the unconventional fault behavior of IBRs can cause traditional protection schemes to misoperate. These difficulties are compounded by the black-box nature of IBR controllers, which makes it challenging to develop comprehensive cybersecurity and protection strategies. …
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Performance Assessment and Management of Large Wind Farms under Abnormal Grid Operating Conditions
… stability following its large scale integration. Fault responses and protection schemes are currently not standardized and neither following consistent practices for existing wind farms which provides research opportunities. This is because different wind generation technologies exhibit diverse …
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A Framework for Assessing the Reliability of Wind Energy Conversion Systems
… in the face of external disturbances, e.g., grid faults and internal component faults. The framework is illustrated using a detailed model of type C WECS - doubly fed induction generator with corresponding deterministic and random variables in a simplified grid model. Fault parameters and …
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DC Fault Current Analysis and Control for Modular Multilevel Converters
… near ideal current and voltage scalability. The fault response, on the other hand, is a big challenge for the MVDC distribution systems and the traditional MMCs with the Half-Bridge submodule configuration, especially when a DC short circuit fault happens. In this study, the fault current …
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Control and operation of HVDC connected offshore windfarm with particular emphasis on faults and black start
… this thesis investigates the different fault characteristics of HVDC connected offshore 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 …
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DC/DC converter for offshore DC collection network
… of the electrical plant may also be reduced through the use of medium- or high-frequency transformers to step up the generator output voltage for connection to a medium-voltage network suitable for wide-area interconnection. However, achieving DC/DC conversion at the required voltage and …
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Analysis in circuit breaker performance requirements for high-voltage DC networks
… on offshore platforms. However, during dc faults these suffer from high currents and the system is unable to transfer power. Prototype dc circuit breakers have been developed by manufacturers to, in theory, allow seamless operation of the healthy areas of the network when a fault occurs. In …
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Power System Dynamic Control and Performance Improvement Based on Reinforcement Learning
… Doubly-fed Induction Generator (DFIG) based Fault-Ride-Through (FRT) system, and modified IEEE-39 Bus based frequency regulation system. In the case of the HVDC-based system, the proposed GSES-based power oscillation damping control approach overcomes the challenges of setting optimal …
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Modeling, Control and Design Considerations for Modular Multilevel Converters
… areas of study in this thesis. Finally, the DC fault analysis as one of the main issues related to conventional VSC converters is assessed for Modular Multilevel Converters (MMC) and the DC fault ride-through capability and DC fault current blocking ability is illustrated in both the Modular …
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Control and operation of MMC-HVDC system for connecting offshore wind farm
… AC voltage control, system stability, and fault analysis of the offshore wind farm system connected with MMC-HVDC transmission.;To control the offshore AC voltage and frequency using the offshore MMC, fixed frequency control is the most common approach. However, offshore system with fixed …
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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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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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A hybrid solution for distributed energy storage for microgeneration in microgrids: Design of the electronic power and control system
… storage units are interfaced to the main system through dedicated power converters. The control schemes implemented in these converters need to be coordinated as to manage the power flows according to the system performance requirements. The main objective of the research is, thus, to propose and …
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Συμβολή στο σχεδιασμό ηλεκτρονικών μετατροπέων ισχύος για διασυνδεδεμένα με το δίκτυο χαμηλής τάσης φωτοβολταϊκά συστήματα
… απαίτησης για ικανότητα αδιάλειπτης λειτουργίας (Fault Ride Through Capability, FRTC) των μονάδων διεσπαρμένης παραγωγής σε περίπτωση σφάλματος του δικτύου. Η διερεύνηση της συμπεριφοράς, καθώς και των επιπτώσεων των παραμέτρων σχεδιασμού, των συνδεδεμένων διεσπαρμένων Φ/Β συστημάτων στο δίκτυο …