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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]

The power quality issues area unit augmenting day by day thanks to the expansion of loading necessities. With the advancement of technology, the facility quality issues are often handled expeditiously by versatile electricity transmission (FACTS) devices like distribution static shunt synchronous compensator, static var reactive compensator, static synchronous series compensator, unified power flow controller etc. These FACTS devices provides solutions for power quality problems with the assistance of shunt device D-STATCOM which reinforces the facility quality by variable varied parameters of the system. The mathematical logic managemental is employed for the control purpose of the D-STATCOM. The performance of D-STATCOM with controller is evaluated with totally different load conditions: R-L load, linear load, nonlinear load and dynamic load. By incorporating D-STATCOM the voltage profile of distribution system are often greatly improved. A MATLAB Simulink model of D-STATCOM is planned that demonstrates the management of active and reactive power and thence maintains the voltage profile. [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. FACTS or flexible alternating current transmission system is an electronic equipment capable of regulating electrical power transmission that can be used to overcome stability problems. This research will analyze the use of SVC and STATCOM as an equipment model from FACTS to overcome the stability of the electric power system on the most critical buses. Simulations were carried out using PSAT using case studies: a 500 kV Java-Bali 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 at STATCOM of 0.149 p.u. (3.85%). [ABSTRACT FROM AUTHOR]