Abstract: The different hydraulic units of pumped storage power station being in the state of power generation and pumping operation at the same time is a major innovation in operation and dispatching mode. In this paper, taking the reservoir of a pumped storage power station as an example, the flow pattern and the hydraulic characteristics in the downstream reservoir under condition of power generation and pumping simultaneously are calculated and simulated by three-dimensional VOF mathematical model. The analysis shows that under condition of power generation and pumping simultaneously, the local flow pattern near the inlet/outlet of the reservoir area is basically the same as the single operation condition. But a water flow channel is formed between the inlet/outlet, and a large horizontal flow is formed in the reservoir area. With its influence, the head loss in the condition of power generation and pumping simultaneously is slightly larger than that of power generation or pumping only.

Key words: pumped storage power station, VOF, simultaneous power generation and pumping, numerical simulation

摘要： 抽水蓄能电站不同水力单元机组之间同时处于发电和抽水运行状态，是抽水蓄能运行及调度方式的重大创新。以某抽水蓄能电站下库为例，通过三维数学模型对下库进/出水口在同发同抽工况下的库区水流流态、流道水力特性等水力参数进行VOF模拟计算研究。分析显示：同发同抽工况下，库区内进/出水口附近局部水流流态与单向运行工况基本一致，但进/出水口之间形成连通的水流通道，库区内形成大范围横向流动，受此影响，同发同抽工况水头损失略大于单发、单抽工况。

关键词: 抽水蓄能电站, VOF, 同发同抽, 数值模拟