Abstract
This study focuses on the critical issue: whether uncertainties in parameters make a difference to transient characteristics. To solve this problem, a mathematical model is established for a multi-parallel hydropower system in the successive load rejection. It is validated against the operation data from Shitouxia Hydropower station located at the west of China. Moreover, we show how parametric uncertainty strongly affects the system output and how the closure law of the guide vane affects water hammer pressure, surge, and rotational speed in the successive load rejection. Results showed that there are nine parameters corresponding to the main effect and total effect exceeding other parameters, and effect level to main effect and total effect are same. In addition, the effect of the keen point on the water hammer pressure, surge, and rotational speed are investigated. Finally, all of these results provide a guidance in analyzing the stability of hydropower system with different layouts of hydraulic subsystems.
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