The AC/DC hybrid microgrid can provide grid-connected interfaces for various types of distributed equipment due to flexibility and controllability. However

the AC/DC microgrid usually contains a relatively high proportion of renewable energy

which is prone to output fluctuations or insufficient output. Reliable power supply of critical loads may not be ensured. Also

distributed devices in the microgrid may belong to different operating entities

and there is a lack of effective information communication between the operating entities

where centralized operation may not be applicable. To this end

we propose an optimal energy management strategy with enhanced power supply reliability of critical loads. An optimal management scheme for distributed energy is established

and an optimal model which aims to enhance the power supply reliability considering priorities of the microgrid loads and the operation limits of each device is developed. An optimal energy management strategy based on the model predictive control is designed

and a distributed subgradient algorithm is integrated. Simulation under various conditions shows that the proposed strategy not only suppresses the fluctuation of power supply caused by renewable energy sources and ensures the power supply reliability of critical loads

but also effectively protects the private information of microgrid’s devices and be suitable to AC/DC hybrid microgrids with multiple operating entities.