Regional hydropower peak regulation limit output estimation optimization method and system

The invention discloses a regional hydropower peak regulation limit output estimation optimization method comprising the implementation steps that the limit output total control quantity A of the target region and the basic information of all the hydropower station units are inputted; three rounds of scheduling is performed so that three rounds of scheduling output Ji of any hydropower station unit i is obtained and the total limit output quantity Xi is obtained through summation; the deviation degree Ri of any hydropower station unit i is calculated and the total limit output quantity Xi and/or the limit output starting time is corrected; and the final total limit output quantity of the hydropower station unit and the limit output starting time are issued to each hydropower station unit so as to form a limit output operation instruction. The output of all the hydropower stations can be allocated with reference to strict implementation of the relevant provisions of "openness, fairnessand justice" when water a