Cascade hydropower day-ahead spot clearing method and system based on time period coupling removal

The invention discloses a cascade hydropower day-ahead spot clearing method based on time period coupling removal. The method comprises the steps of obtaining working data of a target cascade hydropower system; constructing a cascade hydropower day-ahead spot clearing objective function; establishing corresponding constraint conditions; and solving the target function by adopting a variable scale optimization method, and completing day-ahead spot clearing of the target cascade hydropower system. According to the cascade hydropower day-ahead spot clearing method and system based on time period coupling removal provided by the invention, multi-stage solution is carried out by utilizing variable scale optimization, and time period coupling constraints are weakened or even removed by increasing the step length, so that the model can keep the constraint consideration of the original problem, the practicability of the clearing result is ensured, and the method and the system are suitable for popularization and appl