Model Predictive Control Approach for Distributed Hierarchical Control of VSC-Based Microgrids

This paper embeds a high bandwidth distributed hierarchical control structure for a power electronic based ac microgrid. Conventionally, hierarchical linear control loops are applied to control the grid frequency and voltage. However, they suffer slow dynamic response and high sensitivity to parameter variations. In this paper, high bandwidth control approach realized with a finite control set model predictive control (FCS-MPC) scheme to control multiple voltage source converters (VSCs). Furthermore, droop control and virtual impedance are employed to share active and reactive power. At the upper level distributed secondary control can be programmed with much higher bandwidth compare to linearized cascaded control structures. Simulation and experimental results indicate that voltage and frequency have been regulated order of magnitude faster than state of the art.