Model predictive control for power control in islanded DC microgrids

Abstract

Islanded DC microgrid architecture and control have become popular recently. One of the main control architectures is the DC bus voltage following type, where a main generator controls the DC bus voltage and the others follow the bus voltage and the power commands. Conventionally, the power regulation in the following generators is often employed with the droop control method. The main problem of the droop control is the non-precise power sharing characteristic. One of the improvement approaches is to use PI controllers for correcting the power share. However, PI controllers do not provide optimal control. Thus, in this paper a new power control method utilizing model predictive control is proposed and applied in the power control for islanded DC microgrids. The algorithm and method are presented and validated through simulation in MATLAB/Simulink and PLECS.