The Effect of Hydro Turbines and Governors on Power System Low Frequency Oscillations

In the conventional models for the analysis of power system low-frequency oscillation, excitation systems are considered as the main components that cause the low-frequency oscillation, the effect of hydro-turbine and governor systems are usually ignored. In this paper, the low-frequency oscillation model is proposed considering hydro turbines and speed governors. The results obtained by using eigenvalue relativity and sensitivity analysis method show that the hydro-turbine and governor systems do have influence on the power system low-frequency oscillation mode, and discussions are done about the characteristics of low frequency oscillation modes considering the hydro-turbine and governor models.