受到水电站的出库流量的影响，梯级水电站间的水流滞时是动态变化的，如果将水流滞时作为常数考虑，会导致水电优化调度结果的偏差。将水流滞时表示成电站出库流量的函数形式，建立了考虑动态水流滞时的短期梯级水电优化调度模型。动态水流滞的引入，使得短期梯级水电优化调度中的优化变量在大小和时间两个维度上变化，采用常规算法直接求解困难。针对所建立模型的特点，提出了结合逐次逼近法和混合整数线性规划法的求解方案，以逐次逼近法构造了逐步逼近精确水流滞时的迭代流程，迭代流程中每次迭代为一个常规短期梯级水电优化调度问题，采用混合整数线性规划法进行求解。一个两电站测试系统和某8水库的实际梯级水电系统的算例结果表明了所提出模型和方法能够有效提升梯级水电系统的经济效益。%Affected by changing outflow, the flow delay between cascade hydropower stations is a dynamic parameter in short term cascade hydropower optimal scheduling. The constant flow delay will lead to errors in optimal results. Given the function between flow delay and outflow, a short term cascade hydropower optimal scheduling model considering dynamic flow delay is presented. However, through considering dynamic flow delay, variables can be optimized in both quantity and time dimension, which makes the short term cascade hydropower optimal scheduling hard to be solved directly by ordinary algorithm. A hybrid approach is proposed to tackle this difficulty, in which the iterative method actuates an iterative procedure to approximate the real flow delay and the mixed-integer linear programming is adopted to solve ordinary short term cascade hydropower optimal scheduling problem. The efficiency of the proposed method is demonstrated using a test system and a real system which contains eight reservoirs.
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