TY - JOUR
T1 - Effects of inflow turbulence intensity and turbine arrangements on the power generation efficiency of large wind farms
AU - Wu, Yu Ting
AU - Lin, Chuan Yao
AU - Chang, Tsang Jung
N1 - Funding Information:
The accomplishment of this work has financial support from the Ministry of Science and Technology, Taiwan, under Grant Nos. 107‐2221‐E‐006‐228, 108‐2221‐E‐006‐077, and 108‐3116‐F‐006‐013. The work is also partially supported by the Project of Taiwan's Deep Decarbonization Pathways toward a Sustainable Society (Grant No. AS‐KPQ‐106‐DDPP) from the Academia Sinica, Taiwan.
Publisher Copyright:
© 2020 John Wiley & Sons, Ltd.
PY - 2020/7/1
Y1 - 2020/7/1
N2 - In this study, we conduct a series of large-eddy simulations (LESs) to study the impact of different incoming turbulent boundary layer flows over large wind farms, with a particular focus on the overall efficiency of electricity production and the evolution of the turbine wake structure. Five representative turbine placements in the large wind farm are considered, including an aligned layout and four staggered layouts with lateral or vertical offset arrangements. Four incoming flow conditions are used and arranged from the LESs of the ABL flow over homogeneous flat surfaces with four different aerodynamic roughness lengths (i.e., z0 = 0.5, 0.1, 0.01, and 0.0001 m), where the hub-height turbulence intensity levels are about 11.1%, 8.9%, 6.8%, and 4.9%, respectively. The simulation results indicate that an enhancement in the inflow turbulence level can effectively increase the power generation efficiency in the large wind farms, with about 23.3% increment on the overall farm power production and up to about 32.0% increment on the downstream turbine power production. Under the same inflow condition, the change of the turbine-array layouts can increase power outputs within the first 10 turbine rows, which has a maximum increment of about 26.5% under the inflow condition with low turbulence. By comparison, the increase of the inflow turbulence intensity facilitates faster wake recovery that raises the power generation efficiency of large wind farms than the adjustment of the turbine placing layouts.
AB - In this study, we conduct a series of large-eddy simulations (LESs) to study the impact of different incoming turbulent boundary layer flows over large wind farms, with a particular focus on the overall efficiency of electricity production and the evolution of the turbine wake structure. Five representative turbine placements in the large wind farm are considered, including an aligned layout and four staggered layouts with lateral or vertical offset arrangements. Four incoming flow conditions are used and arranged from the LESs of the ABL flow over homogeneous flat surfaces with four different aerodynamic roughness lengths (i.e., z0 = 0.5, 0.1, 0.01, and 0.0001 m), where the hub-height turbulence intensity levels are about 11.1%, 8.9%, 6.8%, and 4.9%, respectively. The simulation results indicate that an enhancement in the inflow turbulence level can effectively increase the power generation efficiency in the large wind farms, with about 23.3% increment on the overall farm power production and up to about 32.0% increment on the downstream turbine power production. Under the same inflow condition, the change of the turbine-array layouts can increase power outputs within the first 10 turbine rows, which has a maximum increment of about 26.5% under the inflow condition with low turbulence. By comparison, the increase of the inflow turbulence intensity facilitates faster wake recovery that raises the power generation efficiency of large wind farms than the adjustment of the turbine placing layouts.
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U2 - 10.1002/we.2507
DO - 10.1002/we.2507
M3 - Article
AN - SCOPUS:85082962517
SN - 1095-4244
VL - 23
SP - 1640
EP - 1655
JO - Wind Energy
JF - Wind Energy
IS - 7
ER -