Pitch angle greatly affects the performance of VAWT. Aiming at the maximum value of CT, this study first obtains the theoretical optimal angles of attack, i.e., 17.7 degrees and-18.4 degrees in upwind and downwind zones. A 2.5D model is simulated using Fluent to determine the magnitude and direction of induced velocity, and an initial pitch angle adjustment law is obtained combining the proposed local TSR. Compared with a prototype wind turbine, C-P is increased by 2.69% after applying the initial adjustment law. The fitting curve angle delta at the abrupt part of pitch angle is analyzed. The smaller the angle delta is, the more evident the performance improvement of VAWT becomes. C-P is increased by 11.68% when the angle is delta = 0 degrees. On this basis, the adjustment law corresponding to delta = 0 degrees of 100 degrees

Keywords:Local tip speed ratio (local TSR);Optimal angle of attack;Output power coefficient;Pitch angle adjustment law;Vertical-axis wind turbine (VAWT)