Study on the optimal dynamic programming method and its application based on long-term average annual energy output

On the basis of dynamic programming theory, taking the optimization of long-term average annual energy output as its criterion, the dynamic reservoir programming model was set up and the calculation on the optimization discharge process of reservoir was described in detail. The method was applied to the Chengbihe reservoir hydropower station in Guangxi of China and it made the long-term average annual energy output increased by 8.5%, which brought a sound economic benefit. The method is very practical and easy to operate and it can provide reference for operations of the built reservoirs.