Ricerc@Sapienza

Active power flows of a meshed grid can be controlled by varying the longitudinal reactance of some network branches through reactive components of fixed impedance: in particular, series capacitors can be used to increase power transfer capacity of underused grid portions, by realizing an optimal operation of the infrastructure. This paper presents a specific application of series compensation together with reconductoring: the power transfer capacity of the 250 km long, 230 kV-50 Hz transmission line under study is actually restricted by its low thermal rating.

The predominant reason for adding series capacitors in power systems is to increase power transfer capacity enhancing both the voltage and angle stability margins. The resulting decrease in series reactance can determine also undesired effects during faults: the fault current increases in dependence of the compensation degree and of the fault location in the system. This paper investigates the case of an Italian 230