Dynamic Enhancement of the Droop Control for Grid-Forming Inverters

The increase of power electronic-based generators is causing inverters in grid-forming mode to become increasingly important. In addition, in grid-connected systems, there are applications where rapid dynamic responses are required. This highlights the limitation of static models, which are only valid for slow dynamics. Therefore, a small-signal state-space model is proposed and, using the droop control strategy, the controller is designed to enhance the rapidity of the system in a wide range of grid impedances and operating points. Both the model and the control loops have been validated by means of simulation.