Saranya Natarajan 1, B.V.Manikandan 2
Single-phase switch mode AC-DC converters are being used as front-end rectifiers for a variety of applications due to the advantages of high efficiency and power density. These classical converters, however, draw non-sinusoidal input ac currents leading to low input power factors and injection of harmonics into the utility lines. Harmonics have a negative effect in the operation of electrical system and hence they need to be removed. Research into passive and active techniques for input current wave shaping has highlighted their inherent drawbacks. Passive filters have the demerits of fixed compensation, large size and resonance whereas active filters improve the power quality of the input current and consequently they improve the power factor. The Power Factor Correction (PFC) which is an active filter based method provides efficient means for reducing harmonics. These circuits reduce harmonics and consequently they improve power factor. This work presents a comparative study of two topologies of single-phase AC-DC boost converters with improved power factor correction (PFC).Both open loop and closed loop control modes are discussed for the considered two converter topologies. Simulation studies have been carried out using SIMULINK tool in MATLAB 7.4 environment.
1PG
student- Department of EEE – Mepco Schlenk Engineering
College, Sivakasi Tamilnadu,
India.
2Professor-
Department of EEE – Mepco Schlenk Engineering College, Sivakasi Tamilnadu,
India.
Single-phase switch mode AC-DC converters are being used as front-end rectifiers for a variety of applications due to the advantages of high efficiency and power density. These classical converters, however, draw non-sinusoidal input ac currents leading to low input power factors and injection of harmonics into the utility lines. Harmonics have a negative effect in the operation of electrical system and hence they need to be removed. Research into passive and active techniques for input current wave shaping has highlighted their inherent drawbacks. Passive filters have the demerits of fixed compensation, large size and resonance whereas active filters improve the power quality of the input current and consequently they improve the power factor. The Power Factor Correction (PFC) which is an active filter based method provides efficient means for reducing harmonics. These circuits reduce harmonics and consequently they improve power factor. This work presents a comparative study of two topologies of single-phase AC-DC boost converters with improved power factor correction (PFC).Both open loop and closed loop control modes are discussed for the considered two converter topologies. Simulation studies have been carried out using SIMULINK tool in MATLAB 7.4 environment.