水电站厂内经济运行模型精度研究

由于机组流量特性曲线以离散形式表达,使得以此为基础的厂内经济运行模型的精度受到了不利影响,而模型求解方法的收敛性能和求解精度也影响着最优决策结果的精度.针对这一问题,提出插值法对模型精度进行改进,并采用动态规划算法求得改进精度后的经济运行总表,在实 际运行水头和负荷已知的情况下,运用四点法查询满足一定计算精度要求的最佳负荷分配.以葛洲坝水电站为例进行验证,结果表明该方法具有实用性.

Accuracy of economical operation model of hydropower plant

As the flow characteristic curves of the unit correspond to the discrete output and the discrete water head,the accuracy of the economical operation model of the hydropower plant can be affected.The convergence performance of the solution method and the accuracy of the solution also affect the decision-making accuracy.To solve these problems,this paper presents an interpolation method,which can be used to improve the accuracy of the model.The total economical operation table was obtained by solving the model using the dynamic programming(DP) algorithm.When the load and the operating water head were known,the four-point method was used to obtain the best load distribution.A case study at the Gezhouba Hydropower Station verified the practicability of the method.