Cascade reservoir combined hydro-fluctuation sequence optimization calculation method and system

The invention discloses a cascade reservoir joint hydro-fluctuation sequence optimization calculation method and system, and the method comprises the steps: fitting the three-dimensional joint probability distribution of upstream incoming water, interval incoming water and downstream water level, and carrying out the random sampling to obtain massive scenes; constructing a multi-target optimization scheduling model, and performing simulation calculation and solution on the multi-target optimization scheduling model based on the massive scenes to obtain an optimization scheduling scheme sample set under the massive scenes; constructing a decision model, optimizing an optimal solution from the optimal scheduling scheme sample set, performing inversion on the reservoir operation process by using the optimal solution, determining the hydro-fluctuation time, and obtaining a cascade reservoir joint hydro-fluctuation sequence sample set under massive scenes; and on the basis of cascade reservoir combined hydro-fluct