For the calculation analysis of power system

the correctness and rationality of operation of operation mode are the key to determine calculation quality. With the proposal of

two carbon target

the access ratio of clean energy will increase gradually and the traditional artificial selection method is not suitable any longer. How to combine the the operation mode sample set which is obtained by the production simulation to automatically extract the typical operation mode is the scientific and technological problem to be solved urgently of the planning work of new power system under the two carbon target. In this paper

the extraction need analysis of the operation mode of power system under two carbon target is proposed firstly; then the automatic extraction algorithm based on K-means++ algorithm and improved clustering validity index is proposed. After that

the extraction mode based on the combination of artificial and automatic algorithms is designed. Finally

the calculation analysis is developed based on the actual data of China Northwest Power Grid and compared with artificially selected operation mode from such two aspects as mode characteristic and safety so to reveal the effectiveness and rationality of the algorithm in this paper

and the contribution of the algorithm in this paper to the improvement of scientific planning level is verified.