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The electrical system operation continuously approaches the stability threshold due to the demand growth over time. The continued of demand growth overtime can cause a voltage drop makes system becomes unstable. Placement of flexible alternating current transmission (FACTS) is an alternative to improve load margin of the system also improve the voltage profile of the system. The types of FACTS are unified power flow controller (UPFC), static var compensator (SVC), thyristor-controlled series capacitors (TCSC) and static synchronous series compensator (SSSC) respectively. The authors compare several FACTS on improving the stability of the tested system by improving their voltage profile in IEEE 14 bus test system. Using sensitivity index by performed continuation power flow (CPF) to know the placement of FACTS device is proposed. It is proven that the placement of FACTS in the system can improve system stability and reliability by increasing the voltage profile and loading margin. The placement of the UPFC in critical bus of IEEE 14 Bus system increase the maximum loading parameter by 0.22 p.u. (7.99%) and improve the voltage profile of bus 14 by 0.23 p.u. (34.86%). [ABSTRACT FROM AUTHOR]

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. A flexible alternating current transmission system (FACTS) is a solid state electronic device is capable to regulate the transmission of electrical power be flexibly used to overcome these problems. This research will analyze the influence of Static Synchronous Compensator (STATCOM) placement, as one of the types of FACTS on the buses of the most critical voltage stability of the power system by using case Java-Bali 500 kV by means of simulation using PSAT software. Voltage stability observed with the help of the PV curve can indicate the value of each voltage at any operating conditions. Voltage value in which the system reaches the maximum loading parameter (MLP) is used to select the most critical bus or line as the location of STATCOM placement. Installation of SATCOM in case of Java-Bali 500 kV can increase MLP (λ) by 0,201 p.u. (5,22 %). [ABSTRACT FROM AUTHOR]