This study investigates the wake shading effect in wind farms, focusing on turbine spacing, horizontal rotor tilt (yaw angle), wind speed, and power production. With the global population increasing, the demand for energy continues to rise, emphasizing the importance of renewable energy sources like wind power. In wind farms, where multiple turbines operate together, the wake effect resulting from one turbine's influence on wind flow for others significantly impacts their power production. This research is focused around Jädraås Wind Power Park in Sweden, using a scaled model of a section of this park in a controlled environment to conduct a detailed analysis. Utilizing both experimental setups in a wind tunnel and numerical simulations for visualization, the study explores the dynamics of wake interactions among turbines and proposes to mitigate their adverse effects.Through the experiments conducted in the wind tunnel, the results demonstrate significant wakeinduced power losses at downstream turbines. The yaw adjustment mechanism of the upstream turbine is used so as to see how it has affected the power output of downstream turbine. The results also indicate significant reductions in power production as a function of turbine spacing. Specifically, the maximum reduction in power output, influenced by the presence of two upstream turbines, occurred at closer spacings between them: a decrease of 66% at 2.08D (2.08 Rotor Diameters between the downstream and the nearest upstream turbine) and 45% at 4.15D. Conversely, at broader spacings of 7.29D and 8.3D, the reductions were more moderate, a decrease of 28% and 18%, respectively. These findings underscore the critical influence of spatial arrangement on the wake-induced power losses within wind farms.Through an investigation of two purposely positioned upstream and downstream turbines at 4D meter of spacing, the optimal yaw angle for maximum combined power generation has been predicted using sinusoidal fitting, the results indicated that at yaw angle range of ±11° of theupstream turbine rotor, a maximum combined power output has been observed. Hence, a sophisticated optimization mechanism should be employed in an operating wind farm so as tolower wake effects.
| Identifer | oai:union.ndltd.org:UPSALLA1/oai:DiVA.org:hig-44382 |
| Date | January 2024 |
| Creators | Tesfaye, Dawit Kefyalew |
| Publisher | Högskolan i Gävle, Energisystem och byggnadsteknik |
| Source Sets | DiVA Archive at Upsalla University |
| Language | English |
| Detected Language | English |
| Type | Student thesis, info:eu-repo/semantics/bachelorThesis, text |
| Format | application/pdf |
| Rights | info:eu-repo/semantics/openAccess |
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