Economic operation of hydropower station: From the point of view of the whole power system operation, the water quantity of hydropower station is used most reasonably to minimize the operating cost or fuel consumption of power system. The factors to be considered when determining the reasonable operation of hydropower stations are:

1, the inflow of hydropower station depends on the hydrological conditions of the river, which is random; The change of operation mode of hydropower station will cause the change of upstream and downstream water levels, thus affecting the later economy;

2. The inflow of downstream hydropower stations depends on the runoff and discharge of upstream hydropower stations, which is delayed in time, so the operation mode of cascade hydropower stations is interactive;

3, need to consider the comprehensive needs of flood control, irrigation, shipping, industrial and civil water.