Mohammad Reza heidary - Electrical Department of Islamic Azad University of Birjand Mashhad, Iran
Soroosh Shooshtarian - Electrical Department of Sadjad University of Technology Mashhad, Iran
Ali Esmaeily - Department of Electrical Engineering of Islamic Azad University of Karaj Karaj, Iran
Mahmood Ebadian - Assistant Professor of Electrical Department of Birjand University Birjand, Iran

This paper presents construction method for reference vector using indirect method while having a self-tuning filter (STF) in shunt active power filter (SAPF) in order to optimize elimination of harmonics. With existing of nonlinear and unbalanced loads in optimizing power quality system, direct total harmonic distortion (THD) is completely powerful and beneficial in comparison to reference vector construction with direct method. Furthermore, indirect method is essential because of using lower sensors that, it results in simplicity of the controlling circuit. In order to extract the parameter with desired (ωn) frequency, STF has been chosen for the input signal. In instantaneous reactive power theory (p-q theory) process of reference vector construction is evaluated considerably. Additionally, experiments are presented in Matlab.

Parallel active filter ; instantaneous reactive power theory ; self-tuning filter- indirect current control (ICC) ;direct current control (DCC)