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Knowledge-Based Approach for Reservoir System Optimization
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DOI：10.1061/(ASCE)WR.1943-5452.0000379.png)
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Abstract
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This paper addresses a knowledge-based approach for reservoir system optimization. The approach takes a more detailed consideration of each turbine in a hydropower plant than the traditional constant output coefficient method. To use this approach, a knowledge expression and a knowledge function are defined for hydropower plant operation. The knowledge expression is extracted by dynamic programming to save all possibly optimal situations of unit commitment, and further, the knowledge function is formulated based on a two-dimensional interpolation of the knowledge expression. Through the use of the knowledge expression and the knowledge function, computer memory requirements can be reduced and unnecessary computations can be avoided in the reservoir operation optimization. To overcome the decomposition schemes in time and in space and guarantee finding the global optimum (in a discrete sense) with an extended time horizon, up to 400 CPU cores are used to run a parallel dynamic programming model, which applies the knowledge-based approach, to estimate the maximum energy production of the Three Gorges Project (TGP) and the Gezhouba Project (GZB) cascade hydropower plants in China in the year of 2010, with 1 day as the time step and 365 days as the time horizon. The case study results show that the maximum energy production of the TGP-GZB system would be 1,035.0 x 10(8) kWh in 2010 under the current operating rules. Thus, there is still room for improvement in energy production, with the maximum increase of 1.83% (18.3 x 10(8) kWh) from optimizing hydropower plant operation and 3.46% (34.6 x 10(8) kWh) from optimizing both hydropower plant operation and reservoir operation. The overall approach is effective in providing optimal assessment solutions with an acceptable computation time. Thus, it can be concluded that the approach can be applied for planning purposes or providing more reasonable boundaries for real-time operation. (C) 2014 American Society of Civil Engineers.
Keywords:
Knowledge-based approach
Hydropower plant operation
Reservoir operation
Parallel dynamic programming model
Three Gorges project and Gezhouba project cascade hydropower plants