Distributed Load Sharing Among Converters in an Autonomous Microgrid Including PV and Wind Power Units

The ability to manage energy within an autonomous microgrid, which enables system optimization, requires coordinated control of the connected power sources. This generally involves coordination of active and reactive power generation. To increase energy management capability, coordination of converter connected power sources can be extended to other tasks such as harmonic compensation and load balancing. However, some units in microgrids, such as wind and photovoltaic (PV) power sources, have local criteria such as maximum power point tracking that determines the reference value for active power generation. In this paper, a distributed control structure for independent sharing of tasks among sources is introduced where units with local active current reference can contribute to generation of only non-active current components in coordination with other units while their active current is generated autonomously. For task-sharing among units, an objective function based on current components is presented. In order to verify the proposed method, optimization of a microgrid with a PV unit is simulated.