Power requirements assessment of FACTS devices by static and dynamic modelling

The dimensioning of a FACTS device should be based on the actual power required to be drawn or injected in order to achieve the desired regulating action depending on the network topology and requirements as well as FACTS location. The primary actions the device is called for are: power flow control; the damping of minor electromechanical oscillations; the keeping of the synchronism following a major disturbance. Whereas for the first action a static analysis will suffice, reliable power assessment for damping oscillations and keeping of synchronism may only be carried out through detailed dynamic simulations considering the network and the FACTS control system adopted. A model for static and dynamic simulation reproducing both separately and concurrently all the regulating actions performed by the UPFC which is recognised to be the most comprehensive FACTS arrangementhas been developed. In particular all the power balances involving the system and the device at any location are respected. A numerical example is presented showing the potentiality of the model for dimensioning of FACTS devices given a realistic case study network