The invention relates to the field of multi-
energy coupling complementary scheduling, and discloses a successive approximation random
dynamic planning method for a
watershed water-wind-light integrated
system, and the method comprises the steps: 1, inputting the description of uncertainty; a plurality of characteristic discrete values are sampled from theoretical probability distribution functions of runoff, photovoltaic output and
wind power output to represent known continuous probability distribution, and uncertainty of input of the
watershed water-wind-light integrated
system is described; 2, solving a
transition probability matrix; describing the continuity of an input
variable time sequence by adopting a simple discrete time
Markov chain; 3, considering an objective function and constraint conditions of the
watershed water-wind-light integrated
system, and constructing a complementary optimization scheduling model; 4, solving by adopting a successive approximation-random
dynamic programming method (SDP-SA), and deducing a scheduling rule, namely a scheduling
decision table, of the watershed water-wind-light integrated system by taking the time period initial storage capacity, runoff, photovoltaic output and
wind power output scenes of the adjustable reservoir in each stage of sub-complementary system as multi-dimensional state variables and the time period final storage capacity as a decision variable; and 5, when an actual inflow condition occurs, looking up the scheduling
decision table to perform interpolation calculation according to the
reservoir capacity and the inflow condition of the current sub-complementary system and the
wind power output and the photovoltaic output which are obtained by forecasting in the period of time, obtaining the
reservoir capacity at the end of the period of time, and completing an
optimal scheduling decision.