Abstract
Primary frequency control (PFC) is one of the most important means used in maintaining frequency stability of power systems. However, as a wide dead band is usually set in the governing system of generation units with digital electro-hydraulic (DEH) control system, the function of PFC in stabilizing system frequency during system emergencies is then decreased considerably. In order to study the characteristics of PFC capabilities in generating units, a mathematical model of a three-area power system is presented in this paper. The simulation study shows that PFC capacity is necessary to maintain power system frequency stability at different dead band settings. The relationship between load disturbance and PFC capacity of the system is also studied. The proposed model will provide useful guides for setting and adjustment of governing system parameters and determination of PFC capacity of power systems.
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