Distributed model predictive control for secondary voltage of the inverter-based microgrid

In this paper, we propose a secondary voltage control approach of islanded microgrid based on distributed model predictive control (DMPC). Each submodule of a distributed generation (DG) is modeled in a rotation reference frame and combine them to achieve the nonlinear complete model. Considering the nonlinear DG dynamics, an input-output feedback linearization is developed. Besides, all DGs only use the local and the neighboring nodes information instead of communicating with a central controller. Thus, the model predictive controller of each DG is derived and the control of the whole system is fully distributed. The simulation results validate that the proposed controllers can regulate the voltage of distributed generation to the desired reference value.