Closed-Form Analytical Investigation of Space-Vector PWM Inverter Fed Induction Motor Drive under DC-Bus Voltage Pulsation
نویسنده
چکیده
Abstract-Voltage sag or unbalance conditions at the input rectifier stage of the ac-dc-ac rectifier-inverter induction motor drive can cause the significant amounts of harmonic voltage at twice the line frequency 2f1. This voltage ripple can have a degrading effect on the induction-machine performance characteristics. This paper presents an analytical closed-form mathematical model and analysis of the impact of DC-bus ripple voltage of the three-phase voltage source inverter (VSI) with the space-vector PWM (SVPWM) on the induction machine phase voltages, currents and torque pulsations. The analytical expressions for the voltage and current space-vectors as a function of the DC-bus voltage pulsation are derived. From the current space vectors the torque behavior is estimated, again as a function of DC-link voltage pulsation. Next, it is shown, that DC-link voltage ripple components may cause large torque pulsation. The proposed analytical method is based on the mixed p-z approach [13], enabling presentation of the results in lucid and closed-form. To verify the effectiveness of the proposed analytical model, experimental results based on laboratory setup were performed.
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