New energy field station does not have the mechanical inertia of the traditional rotary generator, so it is difficult to support the system frequency change. With the continuous improvement of the proportion of new energy power generation, if the new energy field station does not participate in the system frequency adjustment, the frequency will change rapidly when the system fluctuates, which will further deteriorate the system frequency stability, so it is of great significance to study the frequency regulation technology characteristics of the new energy field station. At the same time, as a key link in the new energy grid-connected control system, the phase-locked loop has the function of tracking the frequency signal of the grid connection point, and can help analyze the characteristics of voltage and current. In order to accelerate the speed of the frequency response and adjustment of the new energy station, a third- order phase-locked loop with faster frequency response is designed in this article, which also shares better steadystate performance and dynamic performance in view of the commonly used second-order phase-locked loop that does not have zero steady-state error when the frequency ramp changes, and is applied to the semi- physical simulation platform of the new energy field station. By simulating the step changes of different frequencies and the changes of different frequency ramps, the grid-connected frequency modulation technology of new energy field stations is verified.