高海拔地区大容量机组尾水管进口压力的控制研究

为了使高海拔地区大容量机组水力过渡过程中尾水管进口压力满足规范要求,选择合理的导叶关闭过程至关重要,导叶关闭过程是水力过渡过程中解决水电站运行安全问题最经济、最常用的措施之一。结合某高海拔地区大容量机组水电站工程实例,采用特征线计算方法,应用过渡过程软件进行仿真计算研究。结果表明:对于高海拔地区大容量机组水电站,选择合理的导叶折线关闭规律,能有效地改善尾水管进口压力,从而满足按海拔高程修正后的控制标准。研究成果可为规范控制高海拔地区大容量机组水电站水力过渡过程中尾水管的进口压力提供参考。

Draft pipe inlet pressure control of large capacity generation units in high altitude areas

In order to meet the specification requirements for the draft pipe inlet pressure, it is crucial to select a rational guide vane closure procedure in the hydraulic transition process of large capacity generation unit in high altitude areas, which is one of the most common and economic measures for the safety operation of the hydropower station. In this paper, taking a hydropower station with large capacity generation unit in a high altitude area as the study object, we adopted characteristic line method to calculate the closure procedures using transition process simulation software. The results show that choosing the appropriate broken-line closure procedure of the guide vane can effectively improve the draft pipe inlet pressure of such hydropower stations, so as to meet the control standard which is revised based on the high altitude. The research plays an important guiding role in the application of specifications to the draft pipe inlet pressure control of hydropower stations with large capacity generation units in high altitude areas.