Real-time implementation of electronic power transformer based on intelligent controller

Abstract

Along with the rapid advances in power electronics and semiconductor technology, electronic power transformers (EPTs), which are expected to replace conventional power transformers in the future, are being developed anddesigned. This study presents the dynamic performance of the intelligent controller structure in the control of an EPT.The EPT structure, consisting of the input, isolation, and output stages, is designed for experimental and simulationstudies. A three-phase pulse width modulation (PWM) rectifier is used to rectify the grid voltages at the input stageof EPT. The DC-bus voltage of the three-phase PWM rectifier is controlled by a neuro-fuzzy controller (NFC) againstthe disturbances that may occur in the input stage. In the isolation stage of the EPT, a DC-DC converter circuit isused. Thus, DC voltage obtained from the input part is reduced to the appropriate voltage values. In the output stage,the two-level three-phase inverter circuit is used to provide the necessary voltages for users. The control algorithms forinput and output stages of the EPT have been developed using a dSPACE DS1104 controller card, which can work inreal time with MATLAB/Simulink. Experimental and simulation studies are realized to demonstrate the voltage sag,swell, harmonic, and reactive power compensation performances of the EPT controlled by NFC.