Adaptive Power Frequency Control Strategy for Wind/Photovoltaics/Storage Grid Connected System based on Virtual Synchronizer Generator

Operating condition changes can cause system power frequency fluctuations when the wind/photovoltaics/storage system using virtual synchronous generator control technology is connected to the grid for operation. In allusion to this problem, an adaptive inertia-damping power frequency control strategy based on a virtual synchronous generator(abbr. VSG) was established. Firstly, the VSG mathematical model and Small signal model were established to analyze the impact of the model’s virtual parameter changes on system stability. Secondly, a segmented-linear adjustment function was designed and parameter selection principles were given based on the principle of inertia damping dynamic characteristics analyzed by the power angle characteristic curve when the system is disturbed. Finally, the simulation model was built on the Matlab/Simulink platform. The results show that the power and frequency response of wind/photovoltaics/storage grid-connected system are improved by using VSG adaptive control strategy in the case of operating condition changes, and this control strategy has better transient performance compared to traditional VSG control technology.