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.
Results
Showing 1 to 20 of 23 for “"DC System"”.
-
The Analysis and Study of Power System Designs for Same Polytechnic College in Tanzania
… aims to study and analyze the electrical power system and distribution for the college. Based on the projected load profile of the college and high potential for solar generation in Tanzania, several different power systems utilizing local utility AC electricity and/or photovoltaic (PV) DC …
-
Control Strategies for Minimizing the DC-Link Capacitance in Power Electronics Converters for Aircraft Electrical Power Systems
… electric aircraft (MEA), the electrical power system (EPS) consists of AC and DC power distribution systems to deliver power to various aircraft loads. In main power generation, variable frequency generators (VFGs) generate VF AC supply (380-800Hz 115/230V) to feed frequency insensitive loads. …
-
Adaptive optimal control of AC/DC systems
… a new control strategy for two terminal HVDC systems embedded in an AC network. The control is based upon real-time measurements performed on the AC/DC system. Use is made of a technique for high speed accurate measurement of positive sequence voltages and currents, first developed in the …
-
The design and optimization of a system using an induction motor driven pump, powered by solar panels
… of an induction motor driven water pumping system which is powered by solar panels. The system consists of a positive displacement pump, solar panels and an induction motor with a microprocessor controlled inverter. The reason that an induction motor has been chosen for the project is that …
-
Investigating DC circuit breaker service life
… methods to extend the service life of DC circuit breakers using inductive voltage spike mitigation techniques aimed at reducing electric arcs during switching operations. Unlike AC systems, DC lacks a natural zero-crossing which results in large transient voltages that accelerate switch …
-
Auswirkungen von bildbasierter Navigation unterschiedlicher Automationsgrade auf Leistung, Beanspruchung und Situationsbewusstsein von Chirurgen
… kann IGN den Chirurgen warnen (Distance Control, DC-System) oder sogar das Instrument automatisch abschalten (Navigated Control, NC-System), sobald das chirurgische Instrument sich einer anatomischen Struktur nähert, die nicht beschädigt werden darf. Somit können anatomische Strukturen vor …
-
Design and Modeling of the Cal Poly DC House Power Distribution System
<p>The Cal Poly DC House Project is a large scale multi-student project that involves the detailed design and eventual construction of a DC powered house that will be usable in many rural parts of the world. The large scope of such a project makes it necessary to perform studies before it is …
-
Evaluation of two prototype three phase photovoltaic water pumping systems
Two prototype three phase AC photovoltaic pump systems (Solvo, ML T) and a DC PV pump (Miltek) were tested on a farm borehole in Namibia (latitude 21°6', longitude 17°6'). The PV array consisted of twelve modules (636Wpeak) mounted on a single-axis passive tracker. The depth of the water was 75m …
-
On the use of fuzzy logic to control paralleled DC-DC converters
… current sharing loop of a paralleled DC-DC system is presented that exhibits a considerably improved large signal performance over the presently employed, small signal designed compensators, both in terms of system response and control effort. Because of high system complexity, the …
-
Implementation of power electronics in nuclear power plants: DC electrical system conceptual design and its financial analysis
… technology to a Nuclear Power Plant electrical system by conceptually designing a DC electrical system and comparing it to a reference AC system. The DC system meets the same design requirements as the AC system does. Furthermore, results from the financial analysis illustrate the advantages and …
-
Indirect Matrix Converter as Standard Power Electronic Interface
… power grid and its importance in future energy systems have accelerated the interest of developing new power electronic interfaces for the energy conversion process. The feasibility of applying the indirect matrix converter as the standard power electronic interface for applications with power …
-
Efficiency and Reliability Analysis of AC and 380V DC Data Centers
… a slight improvement in the power distribution system of a data center could save millions of dollars in electricity bills. Benchmarks for both AC and 380V DC data centers are developed and efficiency analyses thereof have been performed for an entire year. The efficiency of the power …
-
Towards Sacrificial Anode-Free Alkyne Electrocarboxylation
… and implementation in continuous flow systems. The aim of this research is to establish a scalable, sacrificial anode-free electrocarboxylation process. This work explores the sacrificial anode-free reductive coupling of phenylacetylene and CO₂ to afford cinnamic acid. Previous …
-
Applications of Power Electronic Converter Based Wideband System Identification in Grid Tied AC Power Systems
… can be used to take real time snapshots of the system parameters. By applying a Pseudo Random Binary Sequence (PRBS) to the duty cycle command of the controller, a small signal white noise component can be super-imposed on the switching commands. This injected white noise signal is wideband in …
-
An analysis of the sociotechnical transition process from the existing centralised alternating current voltage electrical system in the UK to one where distributed direct current voltage is used to meet the energy needs of the built environment
… centralised alternating current (AC) electricity system to one where distributed direct current (DC) systems may proliferate. The development of the new distributed DC system has the potential to address a number of global challenges including the UN’s 17 Sustainability Challenges, particularly in …
-
Battery Energy Storage Systems Applications and Deployment in Dense Urban Areas
… hurdles with new cost-effective first of a kind DC system design for pairing DERs. It is anticipated that these results will fill the gap that currently limits the deployment of energy storage in dense urban areas. This will be achieved through a proposal for a new interconnection scheme that …
-
A novel backup protection scheme for hybrid AC/DC power systems
… scheme designed to safeguard hybrid AC/DC distribution networks against DC faults that are not cleared by the main MVDC (Medium Voltage DC) link protection. The protection scheme relies on the apparent impedance measured at the AC "side" of the MVDC link to detect faults on the DC …
-
Ac-dc Bus-interface Bi-directional Converters in Renewable Energy Systems
… covers several issues related to the ac-dc bus-interface bi-directional converters in renewable energy systems. The dissertation explores a dc-electronic distribution system for residential and commercial applications with a focus on the design of an ac-dc bi-directional converter for …
-
Control of DC Power Distribution Systems and Low-Voltage Grid-Interface Converter Design
DC power distribution has gained popularity in sustainable buildings, renewable energy utilization, transportation electrification and high-efficiency data centers. This dissertation focuses on two aspects of facilitating the application of dc systems: (a) system-level control to improve load …
-
Methods for assessing the impact of silicon carbide traction inverters in electric vehicles
… and more complex and flexible HV Direct Current (DC) bus designs. Emerging semiconductor technologies, such as Silicon Carbide (SiC) Metal-Oxide-Semiconductor Field-Effect Transistors (MOSFETs), hold promise for increased efficiency and extended range. To ensure the safe and reliable operation of …
Page 1 of 2