Abstract: Phase Locked Loop (PLL) plays an important role in the grid-following (GFL) inverter grid-connected system. When the system fails and causes the point of common coupling (PCC) voltage to have a phase jump, the deviations of the PLL may have a great influence on the fault current characteristics due to the dynamic response process of the PLL. The existing studies only give the analytical expression of the fault current when the deviations is constant. The analytical calculation of the fault current considering the PLL dynamic phase locking error needs to be further improved. Considering the dynamic response characteristics of the PLL, this paper analyzes the influence of the PLL deviations on the analytical calculation of the fault current of the photovoltaic grid-connected system. Ignoring the response time of the current inner loop, the analytical calculation model of the fault current considering the dynamic response characteristics of the PLL is established. The influence mechanism of the dynamic response characteristics of the PLL on the fault current is revealed, and the harmonic characteristics of the fault current are clarified. Finally, the correctness of the proposed fault analytical calculation model is verified by the MATLAB/Simulink simulation.