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Journal of Hydroelectric Engineering ›› 2023, Vol. 42 ›› Issue (5): 77-85.doi: 10.11660/slfdxb.20230509

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Analysis of GD2 estimation formulas and statistical formula fit for hydro-generator units

  

  • Online:2023-05-25 Published:2023-05-25

Abstract: The moment of inertia plays a key role in the stability of a hydro-generator unit and the stability of the power system connected. For a hydro-generator unit, it is a key index for measuring its fast reaction performance and imposes a very significant influence on its stability; in engineering, the flywheel moment GD2 is usually used to characterize its moment of inertia. In the design stages of pre-feasibility and feasibility studies, the GD2 value is usually determined by estimation. This paper presents an analysis of the estimation formulas of two types commonly used for GD2 estimation based on typical engineering cases and a large body of statistical data, and discusses how to choose reasonable GD2 values. We use GD2 data samples from the real hydropower units, which have been put into operation in China in recent years, to fit statistical formulas so as to lay a basis for calculation of the GD2 of a hydro-generator unit in the initial design stage.

Key words: hydropower station, moment of inertia, GD2, statistical formula

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