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 40 for “"Fault current"”.
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Study of superconducting fault current limiters in power systems
… of failures in power systems are short-circuit faults. Short- circuit currents can grow thousands of times larger than normal system operating currents, i.e., within milliseconds. This places enormous thermal and mechanical stress on existing transmission infrastructure and may even cause …
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DC Fault Current Analysis and Control for Modular Multilevel Converters
… distributed energy storage, and 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 …
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Specification, Placement, and Control of Fault Current Limiters In Power Systems
… dissertation focuses on the application of fault current limiters (FCLs) in power systems. The formula for the maximum first-peak fault current is derived to assist in specifying inductive FCLs. The specification process can be used to design and select proper FCL devices in a particular …
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A comprehensive overview, behavioral model and simulation of a Fault Current Limiter
… distribution system, a higher operating current state leading to increased fault current levels is attained. Hence, the relay co-ordination is disturbed and equipments such as feeders and circuit breakers need to be replaced with higher rating so that they can handle the new currents …
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Resistive-type Superconducting Fault Current Limiter (RSFCL) and Its Application in Power Systems
… capacity, leading to a sharp rise in the fault current. High fault current levels have severe impact on power systems. They can increase the likelihood of overcurrent damage, which may destroy electrical facilities or even cause system blackout. The resistive-type superconducting fault …
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The analysis and application of resistive superconducting fault current limiters in present and fututre power systems
Fault current levels in electrical systems are rising due to natural growth in demand, the increasing presence of distributed generation (DG), and increased network interconnection. This rising trend is expected to continue in the future. Marine vessel power systems are highly power-dense and are …
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Impact of high penetration of PV generation on power system transient stability and fault current; modeling for real-time studies
The electric power system is currently experiencing a period of unprecedented changes in the technology of generation. Environmental and sustainability concerns led to replacement of a significant share of conventional thermal generation with renewable energy resources. This shift has raised major …
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Incremental Quantities Based Permissive Overreaching Transfer Trip Scheme for Protecting Inverter-Based Renewable Resources
… power system protection due to their low fault current. Conventional protection schemes are designed around the internal dynamic of synchronous generators where they can supply an elevated fault current. This thesis explores a protection scheme designed to enhance the security of IBRs. The …
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Simulation of power station protection equipment
… to enable the coordination of fuses and overcurrent relays for radial power systems under estimated fault current conditions. The grading curves for these protection devices can be produced on a graphics terminal and a hard copy can be obtained. Additional programs have also been developed …
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Design and model: Intelligent solid-state current limiter to prevent sympathetic tripping problem on power and energy applications
… of the Sympathetic Tripping Problem. Limiting fault current and using synchronous condensers for reactive power support were shown to solve the Sympathetic Tripping Problem.
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Control and operation of MMC-HVDC system for connecting offshore wind farm
… distance not affected by the cable charging current. For HVDC connected wind farms, the offshore wind farm AC networks are established by the offshore MMC stations which exhibit significant difference compared to conventional onshore networks. Consequently, this thesis focuses on the offshore …
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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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On the protection of compact DC power systems with high-power energy storage
… with high bandwidth control systems and current limiting functionality. To date, the literature has primarily focused on the control and behaviour of high-power ESS during normal operating conditions with an emphasis on the systems level benefits they offer. Little consideration has been …
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Development and Prototyping of a Ground Fault Circuit Interrupter for 3-Phase 480 Volt Systems
<p>Ground Fault Circuit Interrupter (GFCI) technology was first introduced in the NEC in 1971, yet four decades later the technology has not been introduced to a great extent outside of the home environment. This thesis introduces the difficulties encountered in low-voltage three phase ground fault …
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A computer-aided fault analysis of the VPI electric service power distribution system
… digital computer program to perform fault analyses is developed and discussed in detail. The program is utilized to perform a complete fault study of the distribution system of the VPI Electric Service, as an example test case. Equations are gathered and a computer program is written …
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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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Power processing and active protection for photovoltaic energy extraction
… balanced by this technique exhibit power versus current curves that are convex, which simplifies the required MPPT algorithm. Cell-level power balancing may also ease the testing and binning criteria during manufacturing, which leads to additional cost savings. Differential power processing (DPP) …
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Investigation of disintegration and arcing in electric fuses
… of the fuse elements when subjected to excessive fault currents. The basis of the study involved experimental observation of disintegration of fuse elements and the analysis of the dynamic responses of current-carrying conductors, which precipitate disintegration. The experimental techniques …
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Electrical, Magnetic, Thermal Modeling and Analysis of a 5000A Solid-State Switch Module and Its Application as a DC Circuit Breaker
… systems to protect industrial equipment during fault or abnormal conditions. Compared with the slow and high-maintenance mechanical circuit breaker, the solid-state circuit breaker is capable of high-speed interruption of high currents without generating an arc, hence it is maintenance-free. …
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Analysis of grounding performance for different bio filler medium effect
The importance of grounding system is when any fault current due to the power system problem, or lightning, can allow that dangerous current passes through the earth. Although with current specification and standardization right now is sufficient, there is no harm to try to improve the performance …
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