葛洲坝二江泄水闸分区运行对电站尾水位影响研究

Study on the Influence of Partition Operation of Erjiang Sluice on Tail Water Level of Gezhouba Hydropower Station

因葛洲坝电站发电水头相对较低,将发电水头提高后,即使发电水头增加值较小,但其占发电水头比例也将相对较大,并且由于枢纽工程机组台数多、年发电量大,提高发电水头将显著增加发电量,工程的经济效益将显著提高,因此,有必要通过研究优化葛洲坝水电枢纽运行期二江泄水闸调度运行方式,提高发电水头。根据不同流量级下的入库流量及相应水库运行水位,分析水电站运行资料推导电站达到预想出力时的发电流量;弃水通过二江泄水闸下泄,建立二江泄水闸分区运行的二维水动力模型;模拟计算不同工况下电站尾水位值,研究得出能有效降低尾水位、提高发电水头的水工设施运行方式。

Due to the relative low power generation head of Gezhouba Hydropower Station,the increase of power generation head will result in a relative large proportion of power generation head change,even if the increase in power generation head is small.Moreover,due to the large number of units and annual power generation in power station,the increase of power generation head will also significantly increase the power output and improve the economic benefits of project.Therefore,it is necessary to study and optimize the operation mode of Erjiang sluice gate during the operation period of Gezhouba Hydropower Station to increase the power generation head.Based on the inflow of different flow levels and the corresponding reservoir operating water level,the operation data of power station is firstly analyzed to derive the power generation flow when the power station reaches expected output.Then,as the abandoned water is discharged through Erjiang sluice gate,a two-dimensional hydrodynamic model for the partition operation of Erjiang sluice gate is established.Finally,the tail water levels of the power station under different operating conditions are simulated and calculated by the model,and the operation mode of hydraulic facilities that can effectively reduce tail water level and increase power generation head is obtained.