Investigation and improve of current ripple from rectifier using 3-phase controlled rectifier with capacitor-inductor (LC) filter circuit

This project is proposed to investigate the effect of current ripple in rectifier. In practical operation of Alternating Current (AC) to Direct Current (DC) converter it cannot avoid current ripple when converting to DC side. Definition of ripple is the small unwanted residue existed in DC voltage which has been converted from AC voltage signal. In this paper presents, the minimum current ripple less than 1% were chosen for DC motor operate smooth condition. The DC motor also known as an example of instrument that sensitive to ripple present and lead the DC motor to totally shut down. From this problem, the design circuit must fulfill its requirement to make the value of ripple factor smaller and desirable. To satisfy with suitable ripple factor, 3-phase controlled rectifier with filter circuit has been implemented. The controlled rectifier has abilities to control firing angle, a. The effect of increasing the firing angle, a can minimize the output current ripple produced in the rectifier. Furthermore, the capacitor-inductor (LC) filter circuit is used to limit the ripple by using smaller value of inductor and capacitor compared to the value of inductor filter and capacitor filter. Hence, the output waveform produce contain of AC signal can be reduced. The project were conducted using 3-phase controlled rectifier with capacitor-inductor filter (LC), inductor filter (L) and also capacitor filter (C) circuit. These circuits were simulate by using MATLAB/SIMULINK software.