Voltage Profile Enhancement using fuzzy self-tuned STATCOM
Recently, the demand on electrical energy is growing day by day as a result of rapid industrial development so that it is making the transmission lines more exhausted and affected especially the voltage stability. In order to overcome these problems, a FACTs device STATCOM of 12 pulse two levels is used to increase the capability of transmission lines and improving the voltage profile of the system. In this work, a new technique of fuzzy self-tuning is used in STATCOM's controller where the parameters of PI controller tuned online that is lead to improve the voltage profile when the power system exposed to the abnormal condition. The simulation results of STATCOM with tuned fuzzy-PI controller show an enhancement in voltage profile under many disturbances as compared with the system used STATCOM without this new technique. The results show a voltage profile using fuzzy-PI less over shoot and reach to steady state efficient than conventional PI. The results of total harmonic distortion (THD) show low values due to application of the Sinusoidal Pulse Width Modulation (SPWM) technique and assuming the loads are linear.