Abstract: The microgrid is essentially an active distribution network，which is a combination of the distributed generation（DG）system and different loads at the distribution network voltage level. By analyzing factors such as safety and reliability，energy conservation and environmental protection in the microgrid，and under the premise of meeting safety and reliability constraints，a microgrid multi-objective economic dispatch model comprehensively analyzing the operating costs and voltage deviations of the microgrid was designed to optimize the power of the microgrid scheduling. By setting the safety constraint indexes of voltage safety margin and load loss rate in line with the system safety and reliability in the model，the particle swarm optimization-bacteria foraging（PSO-BF） algorithm was used to solve the multi-objective economic dispatch model of the microgrid. In the application process，system power generation costs，fuel costs，equipment operation and maintenance costs，interaction costs with large grid operations，and pollution gas emission fines were considered to solve the problem of optimal scheduling of microgrid power. The experimental results show that the PSO-BF model under safety and reliability constraints has higher convergence efficiency and significant energy saving effect than traditional models such as PSO for power dispatching in microgrids.

      Key words: safety and reliability； constraints；microgrid； optimal scheduling model； particle swarm optimization-bacterial foraging（PSO⁃BF）algorithm