ISSN (Print) : 2320 – 3765 ISSN (Online): 2278 – 8875 International Journal of Advanced Research in Electrical, Electronics and Instrumentation Engineering (An ISO 3297: 2007 Certified Organization) Vol. 5, I ssue 2, February 2016 Copyright to IJAREEIE DOI:10.15662/IJAREEIE.2016.0502001 651 Power Flow Simulation of a 6-Bus Wind Connected System and Voltage Stability Analysis by Using STATCOM Shaila Arif 1 Lecturer, Dept. of EEE, Ahsanullah University of Science & Technology, Tejgaon, Dhaka, Bangladesh 1 ABSTRACT: FACTS devices have become significant tools for power flow study now-a-days. It has widely improved the power system reliability, operation capability and safety. It has also improved the robust control of power system. FACTS devices are generally made of power electronics devices and circuits. That’s why FACTS devices have appeared as the most outstanding innovation in the era of power electronics and power system. FACTS devices are of many types: TCSC, SVC, UPFC, IPFC, STATCOM etc. Among all the devices STATCOM has become one of the most important power system components for reactive compensation of power and Voltage stabilizing capability. In this paper we have a 6 BUS power system with a variable speed wind generator connected to a BUS. For the stochastic nature of the wind the BUS voltage becomes degraded. With the help of STATCOM, corresponding BUS voltage has been improved significantly which has been studied and simulated in our paper. We have simulated the whole system with MATLAB PSAT environment and analyzed the voltage response, rotor angle response, eigen values, participation factor etc. KEYWORDS:Flexible AC Transmission System Device (FACTS); Participation Factor; Static Synchronous Compensator (STATCOM); Eigen Values. I. INTRODUCTION At present the robust control of power system is the most significant issues to be concerned with. Day by days the system is becoming complex and stability issues are becoming vulnerable. This power system issues must have to be combated with the most reliable devices or equipment. For that reasons FACTS devices have appeared as the most reliable sources of fighting against instability issues of power system. Among all the stabilities such as frequency stability and voltage stability, voltage stability is the most vital one for the power system. Voltage instability issues generally increase as the various stochastic energy sources like solar, wind etc are incorporated to the system. These types of contingencies can easily be solved by the efficient use of FACTS devices. Due to the advancements of power electronics, robust control of FACTS devices and thus power system automation have become immensely outstanding. For our research purpose we have taken IEEE 6 BUS system with a wind generator connected to BUS number 3. Due to connection of wind voltage at bus 3 has been degraded. So we have incorporated a STATCOM (Static Synchronous Compensator) to the bus to improve voltage profile at that bus. The whole system has been simulated using MATLAB Simulink software PSAT (Power System Analysis Toolbox). PSAT has the building block of all FACTs devices. We have taken the STATCOM model from that window. PSAT also has the building block of wind turbine model and wind model. It have constant speed Induction generator, variable speed wind turbine with doubly-fed induction generator and direct drive synchronous generator. II. POWER SYSTEM STABILITY Power system stability may be demarcated as the characteristics of power system which makes it to sustain in a condition of acting stasis under natural operating conditions and when disturbance occurs the system can regain its equilibrium an acceptable level. When the force of restoration and the force of disturbance are equal to or greater than a state of equilibrium occurs and this is called stability especially in case of power system [4]. When the restoring force is sufficient to continue the machines in synchronism with others then the system or machines are stable. On the contrary when one machine loses the synchronism with other machines it becomes out of step or synchronism and