Abstract: New energy with intermittent and uncertainty would seriously impact the operation reliability，

especially in isolated multi-energy complementary generation system，and make the system face certain risks. Thus，reasonable system reserve is the key to avoid large risk loss in isolated island power system under high and new energy permeability. A novel reserve preparation strategy for an isolated system under high and new energy

permeability was proposed using a two-stage model. In the first stage，the optimal hour-level scheduling of an isolated system was determined. In the second stage，a minute-level system reserve optimization model based on conditional value-at-risk（CVaR）was established to achieve minute-level system reserve capacity optimization，then it used discretization method to calculate the system reserve CVaR value. Finally，Cplex was used to solve the model efficiently and quickly. Simulation results show that the proposed reserve optimization strategy can balance the risk of reserve change and power supply reliability.

      Key words: new energy；multi-energy complementary generation system；reserve；risk assessment；isolated

system