Field Measurements and System Identification of Three Frequency Controlling Hydropower Plants


The dynamic behavior of hydropower plants taking part in primary frequency management is investigated during this paper through frequency response, step response, and setpoint modification tests on three Swedish hydropower plants. Gray-box system identification is used to estimate the parameters of easy linear models suitable for Power System analysis and the most important shortcomings of the linear models are mentioned. It is found that frequency response tests with sinusoidal input signals offer additional reliable info about the dynamics of the plants than step response tests. It's conjointly shown that backlash in the runner and guide vane regulating mechanisms are of nice importance for the dynamic behavior of the plants, and that the incremental gain from guide vane gap to power varies significantly with the operation point.

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