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 11 of 11 for “"overcurrent protection"”.
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High Power Density and Overcurrent Protection Challenges in the Design of a Three-Phase Voltage Source Inverter for Motor Drive Applications
… designed, built, and tested. In addition a novel overcurrent protection residing in the inverter dc link is proposed in response to the concern of using normally-on devices in voltage source inverters. Successful hardware validation of both the VSI and the overcurrent protection circuit is …
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Adaptive protection solutions for future active power distribution networks
… in this dissertation is to investigate the protection challenges that this evolution will introduce to the functions of protecting distribution networks, to develop new solutions and implement and demonstrate them in the laboratory. To analyse the potential problems that may be introduced to …
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Design of a high-efficiency, high-performance zero-voltage-switched battery charger-discharger for the NASA EOS space platform
… interleaved phases, commandable charge rates, overcurrent protection, overvoltage protection, soft starting, reliable gate drive circuitry, high efficiency, and good dynamics is demonstrated. The ZVS-BBCD is compared to separate hard-switched multimodule charge and discharge units in weight and …
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A frequency converter to power a soudronic VAA20 welding machine
… of the transistors and provides them with overcurrent protection. The inverter was originally constructed in push-pull configuration. At 20KVA this type of inverter was found to be undesirable, so a full bridge configuration was used in the final design. The converter has been installed and …
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Recommended protection scheme setting coordination for nine busbars transmission grid
Protection system is one of the important parts of the power system. The protection system can be accepted if and only if it is efficient, reliable and realizes some requirements. For protection of transmission line three stepped distance protection can provide remote backup protection to …
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Control of voltage stability on EHV power systems
… and collapse has been found to occur when rotor overcurrent protection suddenly reduces rotating unit excitation. Rotor heating tests on 500MW and 660MW thermal generators have led to a mathematical model which can replicate the rotor's thermal response. This thermal model could, in future, be …
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Microgrid Modeling, Planning and Operation
… methods. Finally, the philosophy for Microgrid protection, especially Time-delay overcurrent protection, will be briefly introduced in both gird-connected and islanding modes.
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Control and operation of offshore wind farms connected with diode rectifier HVDC systems
… safe operation of WTs and an effective offshore overcurrent protection solution is proposed for fault detection and isolation. In addition, the system response during permanent DC pole-to-pole faults is analysed. Finally, the operation of offshore wind farms connected with two parallel …
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Control and operation of MMC-HVDC system for connecting offshore wind farm
… meantime, enable satisfactory operation of the overcurrent protection relays. Considering the requirements of overcurrent relay, a fault current providing control for the offshore MMC is proposed which ramps up current during faults over a predefined profile.;This ensures adequate fault current …
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Protection, Control, and Auxiliary Power of Medium-Voltage High-Frequency SiC Devices
… dv/dt during the switching transient, potential overcurrent, overvoltage, and gate failure can greatly reduce the reliability of implementing SiC MOSFETs in an MV system. By utilizing the parasitic inductance between the Kelvin- and the power-source terminal, a short-circuit (SC) and overload …
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Towards Resilient Protection of Interconnected ICT and Power Systems
… Case studies of state estimation and adaptive protection highlight the application of this approach. The use of ICT in state estimation allows the distinction of a global and perceived view of the power grid, which influences decision-making in the face of challenges. This thesis further …