Ämneskategori: Elkraftteknik

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1. Control and design of Quasi-Z-Source Inverter (qZSI) for grid connected Photovoltaic (PV) arrays
   Sharma, Shrey
   Examensarbete på avancerad nivå, 2018 (MSc - Electric power engineering)
   The renewable energy sources are greener and more environment friendly than nonrenewableenergy sources. They are used for the sustainable power production. Solarenergy is abundant in a lot of places and can be tapped to satisfy energy needs. ThePhotovoltaic(PV) arrays can be connected to an inverter to convert DC output ofPV cells to AC supply for the grid....
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2. Comparison of High-Power DC-DC Converters for Solar Applications with Respect to Efficiency and Chip-area
   Alikhanzadehalamdari, Babak
   Examensarbete på avancerad nivå, 2018 (MSc - Electric power engineering)
   This thesis is intended to analyze and compare the efficiency of the conventional2L-DAB with the so-called Multi-Level DAB (ML-DAB) and three-Level DAB (3LDAB)for the solar applications. The latter features from the three-level legs bothon the LV and the MV sides; while, the former is a combination of the 2L-legs onthe LV side bridge and the NPC legs on the...
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3. On SPMSM rotor position estimation from standstill and for low speeds - Evaluation of techniques for estimating position and speed of an SPMSM
   Johansson, Victor
   Examensarbete på avancerad nivå, 2018 (MSc - Electric power engineering)
   Knowing the rotor position is essential for performing field-oriented control of permanentmagnet synchronous machines. Sometimes, sensorless strategies are employedinstead of using sensors in order to estimate the rotor position. This maybecome troublesome for surface-mounted permanent magnet synchronous machines(SPMSM) since the usual methods rely on salien...
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4. Simulating & Evaluating feasibility to integrate charging of 12V battery with 48V drivetrain for Dual Voltage 48V/12V Mild Hybrid vehicles
   Shukla, Tanmay
   Examensarbete på avancerad nivå, 2017 (MSc - Electric power engineering)
   Dual voltage energy storage systems have become common in mild hybrid vehiclesdue to their advantages such as increased stability and reliability of the system. Theyserve a viable solution for increasing demand of power for Mild hybrid vehicles. Thedual voltage in mild hybrids contains two level of voltages; 48V battery is usedfor electrical drivetrain and 1...
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5. Designing and prototyping of a transverse flux machine in soft magnetic composite using milling and turning techniques
   Mannerhagen, Felix
   Examensarbete på avancerad nivå, 2017 (MSc - Electric power engineering)
   In this thesis a polyphase claw pole machine has been designed, prototyped and verified throughmeasurements. The FE-calculation model have been verified against analytical calculations,there after the design have been changed through an iterative process to a more optimiseddesign. The machine have then been built in a soft magnetic composite, using milling a...
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6. Battery Modelling For Large Current Pulses
   Premkumar, Ayyadurai; Kundaranahalli Renukaiah, Navya
   Examensarbete på avancerad nivå, 2017 (MSc - Electric power engineering)
   Non-linearity due to high current pulses and frequency should be accounted for andincluded in the electrical equivalent circuit model of a battery cell; apart from its dependenceon state of charge (SOC) and temperature. In order to obtain a large current pulsecharacterisation of a given cell, a current pulse testing circuit with both the high currentand high...
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7. Experimental Characterization of Li-ion Battery cells for Thermal Management in Heavy Duty Hybrid Applications
   Lidbeck, Anton; Syed, Kazim
   Examensarbete på avancerad nivå, 2017 (MSc - Electric power engineering)
   The performance and lifetime of lithium ion (Li-ion) batteries are highly dependenton the internal operating temperature which makes thermal characterizationof battery cells necessary. Therefore, the main focus of this thesis work was to characterizepouch and prismatic Li-ion cells by designing and conducting experimentsto measure thermal parameters. The spe...
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8. Omriktare för solceller med energilager
   Olofsson, Simon; Johansson, Markus
   Examensarbete på grundnivå, 2017 (Elektroingenjör (180 hp))
   Box of Energy is a company in Gothenburg who offers battery storage in connection to both solar energy and wind energy and direct connection to the electric grid. They are working to raise the output power that their battery storage can deliver. One way to solve that is to find a new inverter. The company have also received a project to calculate how much ba...
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9. Utvärdering av en mer förnyelsebar elproduktion i Sverige
   Alihodza, Admir; Fahlgren, Anton; Hamidovic, Mirza; Tauson, Niclas
   Examensarbete för kandidatexamen, 2017 (Elektroteknik (300 hp))
   As renewable electricity generation becomes more in demand on the market, the task of producing electricity without interruptions grows more complicated. Conditions like hours of sunshine and wind speed to supply solar and wind power plants cannot be accurately predicted or controlled. In order to maintain a reliable power supply, the supply network must be...
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10. Singing Arc - Konstuktion av en tongenererande teslaspole
    Poposki, Daniel; Marne, Michael; Höglund, Nils; Falk, George; Loftman, Victor; Blomkvist, Niklas
    Examensarbete för kandidatexamen, 2017 (Elektroteknik (300 hp))
    A muscial tesla coil is a form of transformer which at high frequency transforms a low primary voltage intoa considerably higher secondary voltage that results in discharges. These discharges can be modulated intomusical tones by turning on and off the tesla coil with the frequency of the tones.In order to construct a musical tesla coil with variable dischar...
11. Design and modeling of a local energy market
    Sjöstrand, Philip; Zäther, Rickard
    Examensarbete på avancerad nivå, 2017 (MSc - Sustainable Energy Systems)
    The possibility withmicro grids, smart energy buildings, customers with photovoltaic, storage or demand flexibility enables new opportunities for the energy system. Thisthesis is done in collaboration with an on-going-EU-funded project - Fossil- Free Energy District (FED), where Chalmers is one of the partners. The project aims to designand model a local ene...
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12. SiC converter for electrical vehicle - DC-link ripple
    Holm, Anton
    Examensarbete på avancerad nivå, 2017 (MSc - Electric power engineering)
    The increased focus towards electrification of the transportation sector increases the need for smaller, lighter, cheaper and more efficient inverters for use in drivetrains. In most of these inverters, the DC-link capacitor makes up a large portion of the total inverter volume and weight. It is therefore interesting to analyze the DC-link current and voltag...
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13. Grid stability benefits with Seatwirl vs horizontal shaft windpower plant
    Akel, Nour
    Examensarbete på avancerad nivå, 2017 (MSc - Electric power engineering)
    In an ac power system the generated power should be equal to the consumed power in addition to the system losses. In case of any steady state imbalance between generation and consumption, the system frequency will deviate from its rated value. To keep the frequency stable, control power plants have to intervene. This intervention will not be immediate, which...
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14. Evaluation of potential benefits and investment strategies of the integrated heating-and-electricity supply system: The case of Chalmers campus
    Sahoo, Somadutta
    Examensarbete på avancerad nivå, 2017 (MSc - Sustainable Energy Systems)
    The aim of the thesis is analysis of Chalmers’ district energy systems i.e. heating and electrical network with the possibility to invest in different energy alternatives with the goal of developing an integrated simulation model of electrical and heating systems to obtain possible synergies between different energy carriers. Possibilities of installation of...
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15. Fault current generation by STATCOM
    Almutairi, Osama
    Examensarbete på avancerad nivå, 2017 (MSc - Electric power engineering)
    The penetration level of renewable energy resources increases in the power grid since they do not have a negative impact on the environment as the conventional power plants. Renewable energy resources are not required, by the current grid codes, to contribute to restore the voltage stability.Moreover, they do not contribute to the short circuit current durin...
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16. Control methods against voltage collapse based on real-time calculation of voltage stability indicators
    Esreb, Ahmad Sultan
    Examensarbete på avancerad nivå, 2017 (MSc - Electric power engineering)
    Power systems always face disturbances, which could lead to voltage collapse or blackout, and weaken with the increase of power demand or load, which is an everyday challenge to Transmission System Operators (TSOs). Nowadays, there aren’tspecific methods to prevent voltage instability or collapse if a disturbance occurs in a system. The thesis presents a met...
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17. Efficiency Investigation of Line Start Synchronous Reluctance Motors
    Kersten, Anton
    Examensarbete på avancerad nivå, 2017 (MSc - Electric power engineering)
    The need to constrain global warming demands new sustainable and green technologies.Line start synchronous reluctance machine technologies offer a big potentialfor future energy savings in industrial applications. Within this thesis the efficiencyand starting capability of a novel line start synchronous reluctance machine in comparisonto a common induction m...
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18. Scalable Integrated Drive System for Battery Electric Vehicles
    Sharma, Nimananda
    Examensarbete på avancerad nivå, 2017 (MSc - Electric power engineering)
    Conventionally, electric powertrain in battery electric vehicles are designed and optimizedfor a particular vehicle category and performance requirements. In this thesisthe design of an electric powertrain using two different type of machine is proposedwhich can be implemented across passenger vehicle categories and provide variousperformance levels. One of...
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19. Design and analysis of wireless charging combined with conductive charging
    Berntsson, Viktor
    Examensarbete på avancerad nivå, 2017 (MSc - Electric power engineering)
    One way to reduce the amount of emissions from vehicles is to replace the combustioncars with electrical vehicles. To encourage people to do this the electricalvehicles needs to be improved but also the way of charging them. It is necessarythat the way of charging an electrical vehicle is both more efficient and convenientthan filling the gas tank of a combu...
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20. Taming Dragons - Improving power performance of tethered turbine tidal farms
    Singhroy, Eric
    Examensarbete på avancerad nivå, 2017 (MSc - Sustainable Energy Systems)
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