Accurately locking the frequency and phase of the grid voltage is one of the important prerequisites for friendly grid-connected wind power. The topic is to introduce a direct decoupling three-phase phase-locked loop technology based on ab component filtering in this field. Firstly, Orthogonal Signal Generator (QSG) is used to orthogonally transform and filter out harmonics of positive and negative sequence components. Secondly, the positive and negative sequence components of the voltage components (Vα and Vβ) are decoupled by a direct decoupling method and filtered again by a low-pass filter to obtain the required positive sequence fundamental component of the three-phase voltage. Finally, based on the theoretical results of the design, simulation results are used to simulate the technical application effects of the grid faults, and the performance comparison is made with the phase locked loop technology based on the double synchronous decoupling coordinate transformation in the currently applied grid-connected wind power system. The results show that the direct decoupling of the three-phase phase-locked loop based on the ab component filtering has better frequency and phase tracking characteristics, which is more conducive to grid synchronization of grid-side converters in wind power generation systems. This work is supported by National Natural Science Foundation of China (No.51377047 and No.61673226), Natural Science Foundation of Jiangsu Colleges and Universities (No. 17KJA470006), and General Program of Natural Science Foundation of Jiangsu Colleges and Universities (No. 5KJB470014).