Author(s): A Schmid; S Riedelbauch

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Keywords: No Keywords

Abstract: An emergency shut down due to load rejection is a significant transient event in hydro power plants. The guide vane closing law is a key influencing variable on the resulting transient conditions in the power plant and the only variable that can be controlled. This paper proposes the automatic optimization of such closing laws. A spline function closing law in addition to conventional two-step and linear closing laws is investigated. Both single-objective and multi-objective optimization problems are formulated with the goal to minimize the peak rotational speed of the runner as well as the pressure surge on the pressure side. The results indicate that a two-step closing law can improve both optimization goals compared to a simple linear closing of the guide vane. In contrast, a spline function closing law can only slightly outperform the linear closing law for peak rotational speed of the runner but significantly improves the resulting pressure surge. The peak pressure surge is similar between two-step and spline closing laws; however, the remaining pressure fluctuations after the initial surge are almost completely eliminated with a spline closing law.

DOI: https://doi.org/10.1088/1755-1315/1561/1/012040

Year: 2025