Optimization Of Hydropower Scheduling On Small And Medium Reservoirs

Small and medium reservoirs have been a large component of hydraulic structures in our country. And it plays an important role in national hydropower industry. Though theory of optimization of reservoir operation and hydrology forecast has been comparatively matured, its application in small and medium reservoir is not so popular. What is more, with the practice of time-varying electricity price policy, optimization criteria of maximum of power output is not so practical now.In view of the issues above, optimization model of small and medium reservoir operation for hydropower plant was established in this paper. The comparison between the two models, based on optimization criteria of maximum of power output and maximum of power generation benefit, was made. Also projects of different hydrology frequencies, year-start levels, and year-end levels were taken into analysis. On the basis of that, an improved model of three controlled levels was developed. By using the new model, we can get the optimized operation chart without inputting hydrology frequency, year-start level, and year-end level before calculation. The model was employed to Fengtan hydropower plant, and the result showed that it is valuable to improve the benefits of the reservoir function in practice production.It is difficult to gather forecast factors in predicting hydrology in small and medium watersheds. This paper presents a fuzzy clustering forecast model (FCFM) to predict mid and long-term hydrology in rainy seasons, based upon the annually FCFM and the periodicity of the hydrology. The developed model extends the applicability of FCFM from annual predictions to rainy-season predictions, and it is capable of extracting forecast factors from the periodicity of the rainy-reason hydrology. The model was employed to forecast the rainy-season hydrology of the Fengtan drainage area and satisfactory results were obtained.