Afshin Kadri - Islamic Azad University - Bandargaz Branch Bandar gaz - Iran
Seyed reza Mosayebi - Islamic Azad University- Bandargaz Branch Bandar gaz - Iran

In recent years, using Power Electronic Controllable Devices such as UPFC,QBT and CSC has been considered to improve transient stability and damp poweroscillations. These devices can be useful if they have suitable input signals and control strategy. In this paper based on Lyapunov theory mixed with Fuzzy control system (FLC) a useful controller has been developed for damping the electromagnetic power oscillations in a Single Machine Power System. To simulate UPFC,QBT and CSC devices an injection model is used. This model is valid for load flow and angle stability analysis and is helpful for understanding the impact of the Devices on power system stability. Simulation results show that Fuzzy Lyapunov Function has a good performance in damping power oscillation and it can improve the transient stability in power systems.

controllable devices;lyapunov;fuzzy