Method and system for ecological operation of total phosphorus export of cascade hydropower station

A system for ecological operation of total phosphorus (TP) export of a cascade hydropower station, comprising:

• an operation objective construction module, configured to construct an operation objective of the cascade hydropower station, the operation objective being:
• D=ω1·W+ω2·TP, wherein TP is a TP export of the cascade hydropower station, max TP=Σt=1TQk,t·ck,t·Δt;
• W is total power generation of the cascade hydropower station, max W=Σt=1TΣj=1kPj,t·Δt;
• T is a total number of time periods in an operation period;
• k is a serial number of a last stage of hydropower station in the cascade hydropower station;
• Δt is a time step;
• j is a serial number of a hydropower station in the cascade hydropower station from upstream to downstream;
• QRk,t is a release flow of the hydropower station k in a time period t;
• ck,t is an average phosphorus concentration of the hydropower station k in the time period t,
• c
• k
• ,
• t
• =
• M
• t
• +
• M
• t
• +
• 1
• 2
• 
• V
• t
• ;
• Lt is a phosphorus load in the time period t;
• σ is a deposition coefficient;
• QRt is an average release capacity in the time period t;
• Vt is an average storage capacity of the hydropower station k in the time period t;
• Mt is the total mass of phosphorus in a water body of a reservoir area at a time t;
• Pj,t is an average output of the power station j in the time period t;
• t is a serial number of a time period;
• ω1 is a weight of the total power generation;
• ω2 is a weight of the TP export, ω1∈[1, 0], ω2∈[0, 1] and ω1+ω2=1;
• an optimized operation objective obtaining module, configured to change the weight ω2 of the TP export and the weight ω1 of the total power generation according to a set step size, to obtain an operation objective under different weight ratios;
• an optimal solution obtaining module, configured to optimize the operation objective under different weight ratios by using a DPSA algorithm to obtain multiple optimal solutions;
• and
• a water level operation process obtaining module, configured to obtain a water level operation process corresponding to a maximum optimal solution among the multiple optimal solutions, and use the water level operation process to operate the cascade hydropower station.