Fixed Series Capacitor (FSC) Compensation
The AC transmission lines are primarily limited by the inductive reactive impedance (XL). The Series capacitive compensation is adding the capacitive reactance (XC) in series with the transmission line to reduce the overall effective reactance (Xeff) of the line (from the sending end to the receiving end).
The series capacitors provide fixed series compensation and it can be used to increase the power transmission capacity by reducing the overall effective reactance (Xeff) of the line. It is the most widely used compensation since it is a cost-effective technology.
Fig. 1 shows the simple transmission line with series capacitor compensation. The effective reactance of the line (Xeff) can be derived as follows,