This thesis describes a conceptual design of a support frame for a synchronousgenerator used in a vertical axis wind power plant. In this system the generator isplaced on ground level. The thesis also considers the design of housing for thesupport frame and generator. The concept presented in this report is based on anearlier design. Besides geometric design, simplified simulations has been run in orderto optimize some of the parts included in the construction considering naturalfrequencies and structural strength. The result is presented as CAD-models andan assembly drawing.

This thesis considers the integration between Savonius wind turbines and photovoltaics to form a hybrid power system. Different integration techniques were studied to find the most suited technique and the necessary components. The hybrid system was then to be compared with a solar panel system of equal sizing to investigate whether it could compete in terms of production and profitability. A model of the hybrid systems was built in MATLAB Simulink to simulate the production of the systems. Simulations used SMHI measurement data over wind speeds, solar radiation and temperature, with data resolution of one hour for 2017. The Swedish electricity trading market was also studied to determine which guidelines and prices that apply when selling electricity to the grid. The investment costs for the systems were estimated to allow economic conclusions to be drawn. The result was that a hybrid system had a higher power delivery to the load but the total production was higher for the solar system. The hybrid system couldn’t compete with the profitability of the solar system in the studied case. Possible reasons for the result was that the wind resources at the tested location wasn’t enough and that the price for wind turbines was high. Conclusions was that the price of the turbines needs to decrease in order to make the hybrid system more competitive. For hybrid systems that contain wind turbines, it is important that the chosen site has good wind resources to take advantage of the potential of the turbines.

At the Division of Electricity at Uppsala university a project isconducted to develop a smaller wind turbine for conditions in theAntarctica. This is a part of a larger, international researchproject in the field of particle physics known as the Ariannaexperiment. The project consists of developing and installing avertical axle wind turbine of screwed Savonius type. A prototypeof this has been manufactured and installed 2016 in Antarctica forinitial testing and measurement.Wind turbines are subjected to complex and varied loads from windand rotation which gives rise to cyclical strain. The rotor bladesare particularly vulnerable, which imposes high material andconstruction requirements to avoid fatigue and failure, whichoften is caused by vibrations and oscillations. Vibrations can becharacterized in terms of the natural frequencies witch in shortmeans that the system, at specific frequencies, tend to oscillatewith increasing amplitude and at worst, resonate if these areexcited. How a complex design will behave by external periodicinterference is complicated to calculate analytically. Naturalfrequencies are therefore most often calculated using FEM-methodsand computer simulations.The aim of this thesis is to study how oscillating forces interactwith the natural frequencies and rotational loads for a specificSavonius wind turbine. How these are influenced by engineering,design and material selection. The goal is to draw conclusionsabout design and possible materials selection to avoid unnecessaryvibrations. Without this analysis, there is a risk of increasedwear and damage to the structure.The project includes such analysis of two different sizes of theSavonius turbine. A small 200x400 mm and a larger 1000x2000 mm.To understand the problem, a preliminary study of basic harmonicoscillation, strength of materials and of the existing prototypewas made. Following a requirement specification, somedelimitations were made so that the simulations would not be tooextensive. Subsequently, a minor design work was done to obtain 13different configurations of the turbine for simulation using FEM-methods.The result showed that none of the turbines rotational frequenciesis close to the turbine’s natural frequencies. However, accountmust be taken of cogging frequencies in the generator. These arewithin the range of the design's natural frequencies.All simulations of centrifugal force found that there isrelatively little tension at the selected maximum speed of 660 and132 revolutions per minute. However, as the results showed thatthe plates which are mounted between the rotor blades to providestability, creates greater stresses in the structure than thosewithout. Two proposals for the configuration of turbines have beenpresented in the report.

The aim of this study is to act as a pre-study for AirSon Engineering AB regarding a small scale wind turbine they want to install. This by means of collecting data about the windspeeds present at said location, taking into consideration local regulations and doing calculations on the turbulence in the wind, which is affected by nearby obstacles and by the house which the wind turbine is planned to be installed next to. The study puts specific focus on three main questions, namely: What kind of production is to be expected? What is the economy like for the installation of the wind turbine? What are the possibilities/limitations from a construction perspective? An analysis of the location of the installation and a comparison of the selected wind turbines and their respective dimensions, potential for production and economics is presented in this study. The emphasis of the analysis is on examining the respective wind turbines and determining which of them that best fits AirSon with regard to all three aspects. Different graphs have been used to compile wind data and the program used for this study is Matlab. In addition to that the program Excel has been used to compile and present the results for the various wind turbines.  A total of nine small scale vertical axis wind turbines with rated output powers between 1 kW and 10 kW have been examined and are presented as potential suggestions for installation. The manufacturers whose wind turbines are presented are Aeolos, Toyoda and Ropatec. By the end of this study a recommendation from the authors, to AirSon is presented for which windturbine the authors think might fit best. The plan for this study is furthermore to act as a guidance so that AirSon can, following up on the study, directly work toward acquiring and installing said wind turbine. / Syftet med detta arbete är att genomföra en förstudie åt AirSon Engineering AB rörande ett småskaligt vindkraftverk som de vill installera. Arbetet innefattar insamling av data om vindhastigheter från den befintliga platsen samt hänsynstagande till de lokala omständigheterna, till exempel vad gäller turbulensen i vinden, som påverkas av närliggande hinder och av huset vilket vindkraftverket planeras att installeras intill. Examensarbetet har sitt fokus specifikt på tre huvudfrågor, nämligen: Vad för produktion förväntas från platsen? Hur ser ekonomin ut för installationen av vindkraftverket? Vad finns det för möjligheter/hinder ur ett kontruktionsperspektiv? I arbetet presenteras en analys av platsen som vindkraftverket ska installeras på samt en analys av utvalda vindkraftverk med hänsyn till storlek, produktion och ekonomi. Analysens tyngdpunkt ligger i att undersöka det vindkraftverk som passar in bäst för AirSon med hänsyn till alla tre aspekterna. Till analysen har olika grafer använts för att sammanställa vinddata och programmet som användes till detta är Matlab. För att sammanställa och presentera de olika vindkraftverken har Excel använts.  Totalt sett har nio småskaliga vertikalaxlade vindkraftverk med märkeffekter mellan 1 kW och 10 kW undersökts och tagits fram som potentiella förslag för installation. De tillverkare vars vindkraftverk presenteras är Aeolos, Toyoda och Ropatec. I slutet av detta arbete presenteras en rekommendation för vilket vindkraftverk som författarna anser vara lämpligast för AirSon. Avsikten med arbetet är att vägleda AirSon tillräckligt mycket för att de ska kunna använda analysen för att installera verket.