Power quality improvement of PWM rectifier using VFOC and LCL filter

The three-phase ac/dc voltage source converters (VSCs) has the potential to be utilized in diverse number of applications such as grid interface in distributed and renewable energy generation, electric drives and FACTS devices. In this paper, Voltage Flux Oriented Control (VFOC) is used to control the dc voltage, reduce the harmonics and maintain the power factor to unity at point of common coupling. The virtual flux (VF) based estimation is used to apply voltage sensorless control. The VFOC algorithm is evaluated with L and LCL filters. The harmonic reduction effects with LCL-filter topology are better than L-filter. The studied system is modeled and simulated in the MATLAB/Simulink environment. The LCL filter shows better performance compared to L filter.