Abstract: Independent DC microgrid with distributed power supply and energy storage system plays an

important role in improving power supply reliability. The energy scheduling optimization of DC microgrid under

different operating modes was discussed，including diesel generator，fuel cell，micro gas turbine，photovoltaic，

wind power and other typical distributed power sources and power load requirements. According to the operation and maintenance cost，fuel cost，pollutant emission cost of energy and energy storage operation cost of the system model，the optimization scheduling model was established to minimize the total operating cost of the system. An improved intelligent algorithm based on beetle swarm optimization algorithm was used to solve the model. Through the optimization test of two working environments with and without energy storage devices，the significance of considering energy storage regulation characteristics for optimizing microgrid operation and reducing costs was verified，and the effectiveness and superiority of the proposed scheduling model were also proved. 

      Key words: DC microgrid；distributed generation；cost minimization；beetle swarm optimization algorithm；

optimal scheduling