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 23 for “"Hvdc transmission"”.
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HVDC transmission across the Icelandic highlands
A technical feasibility study on an HVDC link connection between the North and the South coast of Iceland across the highlands. A study done with respect to improved stability of the Icelandic transmission system and increased opportunities in load control. Simulations and analysis are carried out …
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One-terminal traveling wave-based protection for HVAC and HVDC transmission lines
… developing one-terminal traveling wave-based transmission line protection methods for HVAC (High Voltage Alternating Current) and HVDC (High Voltage Direct Current) systems. It considers the effect of the sampling frequency on the protection, which until now has not been investigated for …
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Modeling of voltage source converter based HVDC transmission system in EMTP-RV
… applications include but are not limited to HVDC, Flexible AC Transmission System (FACTS) devices such as STATCOM, SSSC, UPFC and Wind generators and active filters. The VSC based HVDC system is a feasible option for bulk power transmission over long or short distances and the grid …
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Design and Optimization of Intelligent PI Controllers (Fuzzy and Neuro-Fuzzy) for HVDC Transmission System
… PI controllers for High Voltage Direct Current Transmission Systems (HVDC) by optimizing the key parameters i.e. membership functions (MFs) and fuzzy rule base in the controllers design. In the first part of the thesis, an adaptive Fuzzy PI controller is designed and the effect of various MF …
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Further analysis and application of the multirate method for power system dynamic simulation
… of Voltage Source Converter-based DC (VSC-HVDC) transmission for voltage stability, and then presents further analysis of the multirate method and its application to power system dynamic simulation"--Abstract, page iv.
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Electric field mill for the simultaneous measurement of electric field strength and ion current diensity
… years, the use of high voltage direct current (HVDC) power transmission has grown considerably. With the increase in the number of HVDC transmission lines and in the transmission voltages, concern has increased as to possible health effects. For research on these health effects to be carried …
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Investigation into voltage and angle stability of a hybrid HVAC-HVDC power network
… investigates the power stability problems of HVDC and VSC-HVDC interactions on their hybrid networks with HV AC link, with the intention of bringing out their weaknesses and strengths. The knowledge of this will assist network planners to be informed on ways of improving the efficiency and …
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QUANTITATIVE RELIABILITY ANALYSIS OF A HIGH VOLTAGE DIRECT CURRENT TRANSMISSION SYSTEM
… to the reliability evaluation of a three phase HVDC bridge composed of mercury arc valves. The approach is developed by which the number of spare valves required to achieve a predetermined reliability level can be obtained for single and multiple bridge configurations. The inversion equipment …
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Direct current distribution systems for residential areas powered by distributed generation
… all areas of the power system namely generation, transmission, sub-transmission and distribution. However, just as history repeats itself, the fight between these two paradigms of power transfer was reignited as DC proved to be comparable and in certain cases better suited for power transmission …
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Series operation of thyristors in HVDC converters
High voltage direct current. (hvdc) transmission of electrical paver has been made possible with the recent advent of multi-anode mercury arc valves with grading electrodes. However, mercury are valves do suffer from random phenomena such as arcback, which requires special bracing for the converter …
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Space charge determination in HVDC power cable and its influence on electric field
Considerable amount of transmission and distribution of electricity is carried out by power cable. At present, most high voltage direct current (HVDC) installation uses traditional (oil-impregnated paper insulation and oil-filled-types) cables which pose a risk of environmental pollution in case of …
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Modeling, control and stability analysis of VSC-HVDC links embedded in a weak multi-machine AC system.
… performance of high voltage direct current (HVDC) transmission links based on voltage source converter (VSC) technology operating in parallel with the existing longitudinal Australian power system. This thesis presents the principle design methodology to achieve robust controllers for VSCs …
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Low-carbon transformation of the German and European electricity systems
… hydroelectric plants, and in HVAC and HVDC transmission lines for the years 2024 and 2034. The second part consists of three chapters on transmission investment. It starts with a chapter on national-strategic decisions on network expansion. A game theory model determines stable …
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DC/DC converter for offshore DC collection network
… provide interconnection of turbines and onward transmission to the onshore power network. High wind farm capacity combined with a move to larger wind turbines will result in a large geographical footprint requiring a substantial sub-sea power network to provide internal interconnection. While …
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DC fault protection in HVDC system and the impact on AC frequency response
… of renewable energy generations requires the transmission of bulky power over long distance and in many applications, HVDC transmission systems become a more preferable choice compared to conventional HVAC systems. Thus, the reduction of conventional synchronous generators in the system …
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Cable train : a platform for in-situ manufacturing of underground cable
… more important. High Voltage Direct Current (HVDC) transmission systems offer efficiency and cost effectiveness over long distances, allow for the linkage of incompatible AC grids, and can be immune to telluric currents and aggressive EMP attacks, which all make these systems particularly …
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Intelligent Fault Location for Smart Power Grids
Modernized and advanced electricity transmission and distribution infrastructure ensures reliable, efficient, and affordable delivery of electric power. The complexity of fault location problem increases with the proliferation of unusual topologies and with the advent of renewable energy-based …
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Control and operation of MMC-HVDC system for connecting offshore wind farm
… converter (MMC) based high voltage DC (HVDC) system emerges as a more suitable solution than HVAC due to its flexible control and transmission distance not affected by the cable charging current. For HVDC connected wind farms, the offshore wind farm AC networks are established by the …
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Control, Topology and Component Investigations for Power-Dense Modular Multilevel Converters
… applications like high-voltage direct-current (HVDC) transmission. However, the use of voluminous and heavy capacitors in SMs also makes MMCs much lower in power density compared to other similar voltage source converters (VSCs). Employing at least twice the number of devices compared to a …
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Design and operation of Low Frequency AC (LFAC) transmission system for connecting offshore wind farms
The offshore power transmission market continuously grows as government incentives for Renewable Energy, and technological advancements lead to the exploitation of offshore wind for electricity generation due to its high capacity factors and the abundant offshore space. Currently, the High Voltage …
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