Analysis of Control Strategy of Active Front End Converter for R-Load

This paper represents the simulation and analysis of a front-end converter. The term Active Front End Inverter refers to the power converter system consisting of the line-side converter with active switches such as IGBTs, the dc-link capacitor bank, and the load-side inverter. Active front end converter (AFE or FEC) converts the AC to DC or DC to AC. The basic objective of AFE is to regulate the DC output voltage and make the line side power factor unity. The main advantage of this converter is to eliminate the lower order harmonics or to reduce the total harmonic distortion (THD) caused by a large nonlinear load. And it is done by using the PWM technique. Sinusoidal pulse width modulation (SPWM) is a popular technique used for the control of output voltage. By changing the modulation index, both the frequency and magnitude of the output voltage can be controlled. The modulation index increases as the fundamental line voltage increases. Thus, by changing the modulation index we can able to change the voltage.