Optimal allocation of SVC and TCSC in power system by means of fuzzy estimator with the approach of increasing the static stability of the voltage

In recent years the demand for electrical energy has been rising steadily whilst the expansion of transmission lines and increased energy production capacity due to environmental and system constraints do not increase as much as this increase in demand This rapid increasing in load demand forces power systems to operate near the critical limits due to economic and environmental constraints FACT controllers such as SVC and TCSC are used for enhancing performance of power systems in terms of voltage/angle stability while improving the power transfer capability and voltage profile in steady state conditions Finding the best location of FACTS devices make these as powerful tool for its aims In this paper we determine the location of SVC and TCSC for increasing the static voltage stability in buses by using fuzzy counter This suggested way is tested by using both Matlab software and Matpower on networks with 14 and 30 IEEE buses and acceptable results have been achieved The continuous static load distribution (cpf) method was used to study the static stability of the voltage using the NewtonRaphson method