Two-layer distributed cooperative control of multi-inverter microgrids

Renewable-intensive microgrids are mainly actualized using voltage-source inverters (VSI). Voltage-controlled and current-controlled VSIs can manage voltage/frequency and active/reactive power flow in microgrids, respectively. A two-layer cooperative strategy is proposed that simultaneously controls both the voltage/frequency as well as the active/reactive power flow. The proposed strategy is fully distributed; each inverter only requires its own information and those of neighbors on the communication graph. The sparse communication structure requires one-way communication links and is more reliable than centralized control structure. The simulation of a 7-inverter microgrid system verifies the proposed control methodology.