Three Level Boost PFC Converter for High Voltage AC-DC Applications

In the present situation, the evolution of growing in of computers, laptops, uninterrupted power supplies, telecom and biomedical equipment has become overpowering. Hence the utilization of such equipment results high power consumption and small power density which provided a large market to Distributed Power System (DPS). Power conditioning, typically rectification is essential usually for electronics equipment. Rectifier behaves as nonlinear load producing non sinusoidal line current due to the non-linear input characteristic. The steady growth of use of electronics equipment is become a significant problem as per the line current harmonic is concerned. Their adverse effects on the power system are many. Hence in three-phase systems, the neutral current magnitude increase and becomes the cause of overheating of transformers and induction motors, as well as the dreadful conditions of system voltage waveforms. A reduction in line current harmonics or Power Factor Correction (PFC) is vital. Boost converter when used in high voltage applications makes the system bulky. Three Level Boost PFC Converter was designed for high voltage applications for improving PF and reduce THD. A controller was tested using MATLAB/SIMULINK for the voltage balancing across the capacitors and PFC of the three level Boost PFC converter. An experimental prototype has been made for low voltage applications. A comparison of the conventional and new converter is done for low and high voltages.