Transient Analysis of Hydropower Plants with Cross-Flow Turbines
16 Pages Posted: 10 Jul 2021
Date Written: 2021
Transients in hydropower plants are complex phenomena impacted by various factors such as turbine characteristics, dimensions of penstocks, closing speed of turbine guide vanes, closing speed of main turbine inlet valves and many others. Transient regimes can result in serious disturbances in hydropower plant operation and even in damage of mechanical and civil components due to water hammer. The best way to anticipate and prevent such adverse outcomes is to conduct a transient analysis based on a mathematical model of a hydropower plant system. In this paper, based on the collected data on 270 hydropower plants with cross-flow turbines, a regression analysis was performed to derive empirical equations which relate the specific speed, turbine rated speed, runner diameter and runner width to the rated turbine head and discharge. The collected data and the obtained regression equations were then used to assess the turbine hill diagrams and to develop a mathematical model for transient analysis of hydropower plants with cross-flow turbines. Finally, the obtained numerical results are validated trough the case studies.
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