A hierarchical power management strategy for multiple single-phase roadway microgrids

This paper proposes a centralized hierarchical power management strategy for multiple single-phase wind/solar generation-based roadway microgrids integrated into a three-phase utility distribution grid. The proposed power management strategy consists of a Central Power Management Controller (CPMC) operating at the distribution grid level to regulate the power flow between the distribution grid and the microgrids, a Supervisory Power Management Controller (SPMC) operating at the microgrid level for voltage and frequency control of each microgrid under the coordination of the CPMC, and a Local Power Management Controller operating at the unit level for power management of each individual unit under the coordination of the SPMC. An adaptive droop control is designed to precisely control the voltages and frequency of each microgrid. Simulation studies are carried out in MATLAB/Simulink to validate the proposed power management strategy for controlling multiple roadway microgrids in both grid-connected and island modes as well as the transition between different modes.