In the distribution electricity market

a bilateral trade agreement containing transaction electricity and transaction price exists between microgrid users and power distribution companies. Aimed at optimizing the economic interest during the contract period

an economic scheduling model based on probability distribution is developed and the solving method based on confidence level is given out. Meanwhile

by determining the best confidence level with the expected cost

a variable confidence level optimization strategy is presented. Finally

the effectiveness of the presented model and the proposed optimization strategy are verified by simulation examples. This work is supported by National Natural Science Foundation of China (No. 51477114).