The traditional PID struggles to accommodate the inherent complexities of wind turbines, nonlinearities and other characteristics, a PID pitch controller based on the whale optimization algorithm (WOA) is designed. However, as the installed capacity of wind turbines escalates, the unbalanced loads induced by wind shear and tower shadow effects are also augmenting. Consequently, the traditional pitch control mechanisms are insufficient to meet the current pitch demands. In response, an azimuth angle weight coefficient is introduced, leading to the design of a PID azimuth angle weight coefficient-based independent pitch controller optimized through the WOA. Utilizing MATLAB/Simulink simulation software, a wind turbine pitch control model is constructed. By comparing the traditional PID unified pitch control and the PID independent pitch control optimized based on the WOA, the simulation results demonstrate that the latter enables the wind turbine's output power to swiftly converge to its rated value, enhances the system’s dynamic response, and precisely modulates the pitch angle to mitigate the unbalanced load on the wind rotor.