Abstract: Multi-energy complementary DC micro-grid is of great significance to achieve sustainable energy

development. Based on the typical DC micro-grid with various energy forms including wind，solar，gas and battery，a multi-energy DC micro-grid operation control strategy considering the complementary inertia of gas and battery was proposed. Aiming at the problem that micro-turbine in micro-grid has large inertia characteristics and cannot quickly respond to load changes，a control method that complements inertia of micro-turbine and battery was proposed，and the rapid dynamic response of the battery was used to compensate for the dynamic characteristics of the micro-turbine insufficient. The proposed control strategy can make full use of the power regulation effect of micro-turbine，reduce system costs，improve the utilization rate of new energy，and provide guarantee for the stable operation of the DC micro-grid. Finally，simulation was used to verify the correctness and effectiveness of the proposed control strategy.

      Key words: multi-energy complementation；DC micro-grid； micro-turbine； energy storage battery；

complementary inertia