Harmonic Analysis of Front-End Current of Three-Phase Single-Switch Boost Converter

Harmonic analysis of Front End Current (FEC) of three phase single switch boost converter to reduce the total harmonic distortion (THD), active switching & passive filters are incorporated in this work. A constant frequency switching is used for active filtering & pulse width modulation (PWM) technique is used to regulate the output voltage. Power factor improvement is accomplished by using PWM technique and passive LC high frequency harmonics filters. An Electro Magnetic Interference (EMI) filter is used to suppress the high frequency component generated by the active switching. Moreover, a series LC filter resonating with the supply frequency is also used to suppress the low frequency value could be made less than 3%, which is a great improvement over the earlier rectifiers that have only EMI filter. In the earlier types of rectifiers, the THD value was as high as 17%. The efficiency of the module is also studied. As the output voltage has the nonlinear relation with duty cycle, the efficiency is also nonlinear with output voltage variation. But up to certain range of duty cycle it could be made linear in nature with output voltage. The efficiency versus duty cycle and THD versus duty cycle curve for the proposed rectifier circuit is given for a clear understanding of the model. General Terms Three Phase Boost Converter, Harmonics Filter.

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