Suggesting a Method for Eliminating Selected Harmonics of 3-Phase Induction Motor Currency

Recently, multilevel inverter technology has emerged as a very important alternative in the area of high-power medium-voltage energy control. In this paper, the 3 and 5-level Voltage Source Inverter (VSI) is designed and simulated. This Paper contributes towards the detailed design, simulation and analysis of 3 and 5-level Diode Clamped Inverter (DCI). This paper presents speed control of three phase induction motor fed by 3 and 5-level VSI. Then the Current waveform, speed waveform and Electromagnetic Torque waveform are shown. Moreover the current harmonics is simulated and analysed. This paper offers the Selective Harmonics Elimination Pulse With Modulation (SHEPWM) technique to control multilevel DCI switching. By applying this method, the current selective harmonics are eliminated. Also, using this technique, the Total Harmonics Distortion (THD) of current waveform is reduced. It is shown that by using the suggested switching strategy within 3 and 5-level inverter, the THD of current would be very low than condition we use traditional two-level inverter.

Keywords:

Multilevel Inverter , Total Harmonic Elimination , Selective harmonic Elimination ,