Review of Power System Stability by Solar Farm as a Facts Controller

The rapid development of power electronics technology provides exciting opportunities to develop new power system equipment for better utilization of existing systems. FACTS devices can be effectively used for power flow control, load sharing among parallel corridor, voltage regulation, and enhancement of transient stability and mitigation of system oscillations. By giving additional flexibility, FACTS controllers can enable a line to carry power closer to its thermal rating. Mechanical switching has to be supplemented by rapid response power electronics. It may be noted that FACTS is an enabling technology, and not a one to one substitute of mechanical switches. FACTS employ high speed thyristors for switching in or out transmission line components such as capacitors, reactors or phase shifting transformers for some desirable performance of the systems. Power system are often subjected to various disturbances such as generator malfunctioning, outage of a transmission line, various types of faults like symmetrical or short circuit faults, asymmetrical faults like line to ground fault, line to line fault, double line to ground fault, various losses in transmission line, thermal issues etc. the protection of power system under these circumstances is a tedious and complicated process. This paper presents utilization of a PV solar farm as a STATCOM controller. According to the switch condition the solar energy is used to improve the stability. This functionality will provide the voltage regulation and improves the stability and transfer limits far beyond minimal incremental benefits.