Assessment of the effect of hydroelectric power plants´ governor settings on low frequency inter area oscillations

This paper deals with the specific problems of the electromechanical systems of large size hydroelectric power plants regarding low frequency inter area oscillations, which are prone to occur once the interconnected operation of Turkish Power System with the ENTSO-E CESA (former UCTE) System is established. The expected frequency of inter area oscillations is close to 0.15 Hz, which is in the frequency range of interest of speed governing structures of turbines, as shown in the first and second parts of the paper. In the proceeding part, the governor parameter tuning study with regard to the defined objectives considering the contingency handling and system stability is explained and the effect of retuned governor settings of the sample hydroelectric power plant on the multi machine system is shown. In the final part, conclusions are made regarding the operation and dispatch of hydroelectric power plants in synchronous interconnected operation of the Turkish Power System and the ENTSO-E CESA System.