Cooperative MPC-based Hierarchical Control of Hybrid AC/DC Microgrid

Focusing on the system with renewable distributed generations, this paper builds the microgrid system for improved electrical power supply. Traditionally, to realize hierarchical control of microgrids, linear control methods are usually adopted. However, they are reported to be not good at tackling complex nonlinear and stochastic problems. Thus, in this paper, more advanced and cooperative methods are proposed. Specifically, model predictive controls (MPCs) are firstly designed for both primary and secondary control levels and AC/DC subgrids. Then a transient function based on the switching control mechanism to alleviate transient deviations when system operation changes is proposed. Finally, a coordinated switching principle for the cooperation of hierarchical control is presented to combine the advantages of MPCs. Comprehensive case studies and comparisons with existing traditional methods have validated the effectiveness of the proposed methods.