Daily electricity generation plan making method of cascade hydraulic power plant group

A daily electricity generation planning method of cascade hydropower plants, for optimize the economic benefits of the cascade hydropower plants, comprising the following steps of using a computer having a processor for:

• Step 1:
• analyzing historical data of daily load demands of each hydropower plant to obtain a typical load curves having a typical daily load demand for each hydropower plant;
• Step 2:
• performing a first optimization to obtain a daily electricity generation plan of the cascade hydropower plants by using reservoir operation methods and taking a degree of similarity between a power load of the hydropower plants and the typical daily load demand of each of the hydropower plants being closest as an optimization goal without considering constraints for opening and closing state of the generators of the hydropower plants, as to optimize a total power output of the cascade hydropower plants, wherein the Step 2 comprises following two sub-steps:
• Step 2.1:
• using optimal allocation method to determine the power output of each hydropower plant and determine a best total water consumption curve according to the configuration of generator sets, and then determining the constraints of opening and closing state of the generator based on the total water consumption curve;
• Step 2.2:
• taking the maximum similarity between the power output and the typical daily load demand as one of the optimization objectives without considering the constraints of opening and closing state of the generators in hydropower plants, and then optimize the daily electricity generation plan of each plant;
• Step 3:
• planning the opening and closing state of each generator set according to the daily electricity generation plans of each hydropower plant derived from Step 2, wherein the opening and closing state of each generator set includes a sequence of opening and closing of each generator and the number of each generator to be open or close;
• and
• Step 4:
• increasing the constraints of the opening and closing state of each generator set, and performing a second optimization to obtain the daily electricity generation plan of each hydropower plant by using reservoir operation methods with the same optimization goal in Step 2, as to optimize power output of each generator and water consumption in each hydropower plant for satisfying the typical daily load demand.