Abstract
This manuscript presents the effects of changing modulation indices on current and voltage harmonics of universal motor when it is supplied by single phase PWM (SP-PWM) inverter, the effect has been analyzed with simulation and experimental setup. For variable speed applications universal motor can be controlled either by phase angle control drive or by SP-PWM inverter drive. SP-PWM inverter-fed drive is common technique that is used to adjust the voltage applied to motor, so that variable speed can be obtained. With the application of SP-PWM inverter-fed drive, harmonics are generated because of power electronic devices. According to the IEEE standard 519, the total harmonic distortion (THD) must be within 5%. In this paper, the effect of modulation index (MI) is used to analyze THD content, and its variation alters the harmonic content. However, the effects are also analyzed through experimental setup in order to validate the system performance. In future work, keeping modulation index constant, different PWM strategies can be employed in order to decrease harmonics.
Highlights
In recent years speed control of universal motor by using SP-PWM inverter fed drive is widely used because of its efficient control [1], [22]
A simulation model is developed for harmonic analysis of universal motor when it's fed by SP-PWM controlled single phase inverter-drive
When universal motor is operated for variable speed or high torque applications by incorporating power electronic converters in result harmonics are generated
Summary
In recent years speed control of universal motor by using SP-PWM inverter fed drive is widely used because of its efficient control [1], [22]. Out of several PQ disturbances THD is most common type of disturbance, it’s necessary to analyze THD content due to usage of power electronic components used in household appliances to guarantee the more pure form of power to customers [9] Due to these harmonics, problems are created which include interference with communication lines, degradation of insulation levels of equipments, heating of www.ijacsa.thesai.org (IJACSA) International Journal of Advanced Computer Science and Applications, Vol 9, No 7, 2018 winding, excessive currents, increased power losses which reduce life of equipment. In this research work development of simulation models of universal motor and PWM controlled single phase inverter-fed drive is presented by using Matlab/Simulink/Simscape software. A simulation model is developed for harmonic analysis of universal motor when it's fed by SP-PWM controlled single phase inverter-drive.
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