Arash Khoshkbar Sadigh - Faculty of Electrical and Computer Engineering, University of TabrizTabriz, Iran
Seyed H. Hosseini - Faculty of Electrical and Computer Engineering, University of TabrizTabriz, Iran
Soheil Nazemi - Faculty of Electrical and Computer Engineering, University of Tabriz Iran

In this paper a shunt active power filter(APF) has been used to filter harmonicsand/or compensate reactive current drawn bynonlinear and/or linear loads. An onlinecontrol method based on the discretenonlinear model of inverters is applied toAPF. The optimal feedback controls the APF current in a very fast and efficient manner. A novel extraction system based on the modified correlation function adopted as part of the control system of a single phase active power filter to provide the required reference signals for harmonic filtering and reactive power compensation. Advantage of the proposed modified correlation function is its implementation to network with distorted voltage. The compensation principle of the proposed control algorithm is presented in detail. The circuit is simulated using PSCAD/EMTDC software and simulation results are presented to validate the effectiveness of the novel compensation method.

Active Power Filter (APF), Correlation Function, Harmonics, Power Factor