抽水蓄能电站水沙调控数值模拟研究

Numerical simulation of sediment management for pumped storage power station

抽水蓄能电站在提高电力系统运行安全、稳定及可靠性等方面具有不可替代的地位,过机泥沙特性是制约电站安全运行的关键因素之一。本文针对抽水蓄能电站独特的日或周调度运行模式,通过虚拟设置多处分、汇流的方式逼近进/出水口附近复杂的往复流流态,耦合模拟上、下水库水沙以及过机泥沙,建立了抽水蓄能电站非均匀全沙数值调控模型。运用实测以及物理模型试验成果验证模型的正确合理性,并通过工程实例探讨了抽水蓄能电站水库泥沙淤积形态、过机泥沙含沙量及粒配等特性的变化规律。

Pumped storage power station plays an irreplaceable role in improving the security, stability and reliability of power system operation, while sediment passing through the turbine is a key factor that restricts the safe operation of power station. This study adopts virtual confluence nodes to simulate complex flow pattern near the inlet and outlet of power station, and integrates the calculations of the upper and lower reservoirs and the sediment passing through the turbine. Then, a numerical model of flow and non-uniform total sediment control is developed for pumped storage power station in daily or weekly operation mode. This model is verified by using both field observation data and physical model tests. In a case study, the effect of reservoir stage on reservoir sedimentation and turbine sediment concentration is analyzed.