The intention with this essay is to illustrate the conflicts that might occur when states implement renewable energy strategies on lands that have traditionally belonged to indigenous peoples. To do so I have analysed case studies from Sweden as well as Latin America regarding renewable energy projects in areas that could be claimed to belong to indigenous groups and compared the conclusions from these studies to what the existing legal framework on the topic of the rights of indigenous peoples dictates. The results show that the main international legislation on the topic is very clear in expressing that states should grant indigenous peoples access to lands and territories that have traditionally been occupied by them, as well as granting them participation in the exploitation of natural resources. The analysis of the case studies shows that there exists a tendency among states to bypass what is stipulated in the international regulations when executing renewable energy projects, as well as using the term “sustainable development” as a cover-up when violating the rights of indigenous peoples. Although the international legislation on the topic is very precise, the majority of the world’s countries have not ratified the main legally binding convention. I conclude that one reason for this could be that states would find it hard to reach environmental objectives while at the same time complying with the legislation on the rights of indigenous peoples, i.e. states face difficulties in fulfilling sustainable environmental and economic objectives with sustainable social objectives.

The company Airson Engineering AB has an office building on their property in Ängelholm,Sweden, with an integrated roof slope. The purpose of the slope is to improve thepreconditions for a small-scale wind turbine in accession. AirSon desired both an evaluationof the appointed locations prerequisites, and possible installations. While focusing oneconomic benefits, electricity production and Public Relations. By simulating how the wind flow was influenced by the building in the program RWIND, theresult showed that the wind that hits the slope indeed accelerates. After this, the projectcontinued with a frequency analysis of the wind. To give AirSon a greater basis for an eventual investment, the market was analyzed. Possiblerisks, important knowledge to have before an investment and the legal framework wasdocumented. Six possible wind turbine installations were analyzed. Three of them had vertical axes andthree of them had horizontal axes. The size of the wind turbines in both categories rangedfrom 3kW to 10kW. All turbines were manufactured by Aeolos Wind Turbine. In the case of AirSon, a small-scale wind turbine installation is ultimately not recommended. The slope accelerates the wind by approximately 30%, but that’s not enough to make aninvestment economically profitable. For someone who is not well acquainted with the subject, the small-scale wind turbine marketcan be treacherous. It is important for consumers to thoroughly analyze possible options andto have a critical mindset, to reduce the risk unnecessary complications. This report tacklesthis issue as well and provides advice for possible consumers.

With more and more countries transforming their energy focus onto renewable energy, the growth of wind energy is at its all-time high. Despite being a relatively new technology, offshore wind has thrived rapidly in the past decade. Sweden has been incorporating offshore wind energy into marine spatial planning (MSP) and national interest in energy production with a view to realizing the national goals of 100% renewable electricity generation by 2040 and net zero emissions by 2045. The goal of this study is to identify locations that are suitable for harvesting wind energy resources in nearshore sea areas of Sweden, with the consideration of social, environmental, economic, and technical criteria. The spatial analysis was performed by the combination of Geographical Information System (GIS) and Multi-Criteria Decision Analysis (MCDA). Analytical Hierarchy Process (AHP) was the MCDA method adopted, where the criteria, including 11 constraints and 5 factors, were identified and examined by processes of weighted linear overlay (WLC) and Boolean overlay respectively. Then, the suitability index (SI) was computed and a suitability map, showing 4 classes of suitability, was generated.The results show that less than half of the Swedish coastal sea areas are highly or fairly suitable for offshore wind power development, while the rest was unsuitable. The unsuitable areas were mainly a consequence of the constraints of protected areas and military-related claims. The results were also compared to the areas indicated in the municipal plans for wind power, the national interest for wind energy production, as well as the existing and rejected wind turbines. This indicated that the study results correspond well with them and that the space for offshore wind energy is still plentiful despite the large exclusion area. The applied methodology and results of this study can be a stepping stone to planning authorities and developers in the planning decision-making process.

Nowadays, the climate change issue is becoming more and more actual in our society. Increase of the average temperature on Earth in a couple of degrees could have catastrophic consequences. One of the possible solutions seems to be renewable energy sources as photovoltaics, biomass of water and wind energy. This thesis deals with the aerodynamics problems of wind energy source. Wind turbines transform kinetic energy of wind to mechanical power. The efficiency is physically limited to 59,26 %, but in reality, it is getting around 45 %. This is caused by three biggest losses inducted in wind turbines as wake losses, losses due to finite number of blades and drag losses. Based on analytical relationships and including these three losses the aerodynamics blade design is conducted. Later, the numerical simulations show higher values of drag and lower values of lift force on airfoil compared to analytical calculation. In fact, percentage deviations are acceptable and to conclude, the numerical analysis was able to relatively accurately simulate force action of free stream velocity on the blade.

With rapid depletion of fossil fuels and increasing environmental concerns, the trend to capture renewable energy, especially through wind energy resources, is increasing. The doubly fed induction generator (DFIG) is the most widely used generator for wind energy conversion because of its various advantages over other types of generators. In a DFIG, the rotor is fed through back to back converters via slip rings. The converters enable the generation control. This control property can be used to support reliable operation of a grid network system. Interarea oscillation has been a major factor in limiting power transfers in interconnected power systems. Poorly damped modes can trigger oscillatory instability, potentially leading to cascading blackouts in such systems. We consider a two-area system where DFIG based wind generation is integrated with conventional synchronous generators. A simple controller is proposed for the DFIG to improve damping of interarca oscillations. To support the proposition, case studies are conducted in Matlab/Simulink. The effectiveness of the proposed controller is then analyzed by eigenvalue analysis and verified with time domain simulation results. The results show that a properly tuned controller can increase the damping of dominant oscillatory mode by nearly 5% while improving the area transfer by about 200 MW of wind power. The results further show that with the proposed control strategy, damping of dominant oscillatory mode increased by more than 10%. / North Dakota State University. Graduate School / North Dakota State University. Department of Electrical and Computer Engineering

Northern regions of Canada are of special interest for renewable energy investment due to the high cost of traditional energy generation in remote communities (Das & Canizares 2016b). However, climate variability and change have a substantial impact on renewable energy yield and system vulnerability (e.g., Ravestein et al. 2018; van der Wiel et al. 2019), and the North will experience more dramatic impacts due to climate change compared with other parts of Canada (Serreze 2015). Using the Canadian Regional Climate Model Version 4 (CanRCM4) large ensemble driven by Representative Concentration Pathway 8.5, current and future wind and solar energy potential, variability and covariability in northern Canada were assessed. Eight focal communities were additionally selected for in-depth analysis based on the work of Das & Canizares (2016b). Robust increases in annual average wind power potential (WPP) are projected across the northernmost part of the study area by 2070-2099 (up to 30%), with changes most pronounced in cold seasons. Decreases in WPP are projected for southern areas. Solar power potential (SPP) is projected to decrease across the study area, with robust changes emerging by as early as 2010-2039. For the focal communities, WPP stability (as measured through inter- and intra-annual variability) is projected to increase, while SPP stability is projected to decrease. The changes in WPP variability are associated with a dampening of the seasonal cycle of WPP in the north. Monthly mean WPP and SPP are negatively correlated, with approximately oppositely-phased seasonal cycles. Combined wind/solar installations therefore show reduced sub-annual variability, stabilizing power supplies relative to installations of solely wind or solar power. Drivers of change in WPP and SPP are complex, but changes in sea ice across the 21st century will play an important role for both WPP and SPP. Over the northern ocean regions, the influence of sea ice loss on roughness length is found to be more important than impacts on surface layer stability. Changes in storm winds also play a role, but impacts due to synoptic storm activity are difficult to distinguish from shifts in the wind speed distribution. Decreases in SPP can be attributed to projected reductions in downwelling shortwave radiation, which in turn are closely associated with changes in cloud characteristics (e.g., optical depth), as measured through CanRCM4 column liquid/ice water content. Clear-sky changes in shortwave radiation were not directly assessed, but are potentially impacted by robust increases in column water vapour. Overall, northern regions of Canada and the focal communities show high potential for renewable energy generation across the 21st century. Projected increases in wind power resources and wind power stability in the focal communities could enhance the cost-savings and emissions reductions predicted based on current climate assessments (e.g., Das & Canizares 2016b). With ever improving technologies and declining costs, the viability of renewable power in the north is likely to become even more certain in years to come. / Graduate

The aim of this paper is to acquaint the readers with basic classification of wind turbine configuration by used electric generator, with speed and power control used in power plants and with mathematical model of wind and parts of power plant. Procedure of making model in applications Mathematica and MathModelica is described in the other part of this paper. There were made models of power plants with squirrel cage asynchronous generator, one with pitch control, the other with stall control. In the last part of the thesis comparison of model behavior of both models with the same input conditions was made.

This Master´s thesis deals with problematics of wind powered generators and their use in off-grid systems. In its first chapters aspects of wind as a power source are analyzed. Further on the thesis focuses on individual components of the off-grid systems. Also designing procedures of these systems are presented in the paper. The key parts of the thesis are 3 off-grid wind power system designs, which can be used to power a family house, and their energetical and economical evaluation.

This master thesis deals with problematic wind power plants. There are described advantages and disadvantages of wind power plants and their environmental impacts. Thesis include chosen locality for wind power plant, chosen fitting types of turbines and calculation which choosing turbine for chosen locality. There are accomplished parametric studies of main parameters. From this study is chosen best fitting model of wind turbine. In the end are adduced statistics from Czech Republic, Europe and world.

Germany is one of the pioneer countries in wind turbine technology. They installed many wind turbines during the last decades and are now confronted with a shortage of land suitable for new wind parks. Now, with an estimated wind turbine service life of 20 – 25 years whole wind parks are becoming obsolete and owners have to decide whether do decommission, repower or to continue the operation of their parks. The advantages of repowering as well as the bureaucratic hurdles are outlined and evaluated. This thesis deals with the repowering potential in North Rhine-Westphalia and is analysing the technical and economical possibilities of repowering. The main objectives are to identify wind turbines eligible for repowering and also to develop repowering scenarios in order to determine their techno-economic feasibility.  The designed steps of the methodology allow the census and the subsequent implementation of the results in WindPro and RETScreen.