Abstract
The aim of the study is to analyze the effect of DC link fluctuations on the output voltage of the inverter. Voltage Source Inverters (VSI) plays a dominant role in the industrial world. Most of the industries use rectifiers to convert single phase AC supply to DC supply. DC supply is fed to the Voltage Source Inverter (VSI) through a DC link capacitor. The capacitor decides the quality of output fed to the Voltage Source Inverter. Six pulses are given to the Voltage Source Inverter by means of MCBRCPWM (Multiple Carrier Based Random Carrier Pulse Width Modulation) technique. The output of Voltage Source Inverter is fed to a three phase squirrel cage induction motor. The investigation of MCBRCPWM with different capacitor values provided in the DC link has been effectively discussed. The results of harmonic spectra and Total Harmonic Distortion (THD) are given in the paper. Simulation results prove that as the value of capacitor increases, the evaluation parameters such as Total Harmonic distortion, Fundamental Voltage and Harmonic Spread Factor (HSF) are improved.
Highlights
The study on Voltage Source Inverter (VSI) working with fluctuating input has been carried out by few researchers
The dc link voltage fluctuation problem is a serious problem to be considered for an inverter system which utilizes a single phase AC source as proposed by Enjeti and Shireen (1990)
This study proposes a technique to effectively prove the effectiveness of the MCBRCPWM in distorted input conditions
Summary
The study on VSI working with fluctuating input has been carried out by few researchers. The dc link voltage fluctuation problem is a serious problem to be considered for an inverter system which utilizes a single phase AC source as proposed by Enjeti and Shireen (1990). Single-phase AC-DC converter combined with a three-phase DC-AC inverter has been widely used in electrical drive systems. The DC-link voltage contains a ripple component twice than that of power line frequency because of the single-phase converter configuration. Beat phenomenon of the motor current usually occurs, when fed by a fluctuating DC-link voltage. This causes torque ripple and noise in the motor, when the electric frequency of the motor is found to be near the DC-link ripple frequency as given by Habetler and Divan (1991)
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