Comparison of Static Var Compensator (SVC) and Unified Power Flow Controller (UPFC) for Static Voltage Stability Based on Sensitivity Analysis : A Case Study of 500 KV Java-Bali Electrical Power System

Demand for electricity is increasing rapidly, the consequence of this is a threat to the stability of the electrical system, one of which is the voltage stability. FACTS or flexible alternating current transmission system is electronic equipment capable of regulating electrical power transmission that can be used to overcome stability problems. This study will analyze the comparison of SVC use with UPFC as an equipment model from FACTS to overcome the stability of the electric power system on the most critical buses. Simulations are carried out using PSAT using a case study: a 500 kV JavaBali network. Then the stability of the voltage is observed using the help of the PV curve which can show the value of the voltage conditions in each operating condition. SVC installation in the Java-Bali 500 kV case does not reduce the active power losses or reactive power, but also the addition of length λ is 0.233 p.u. (6.01%) and compared to the addition of length λ in the UPFC of 0.38 p.u. (9.82%) and there is a reduction in active power losses of 0.002 p.u. or 0.203% but there is an increase in reactive power losses of 0.007 p.u. or equal to 0.676%.