Reverse Harmonic Injected High Power Square Wave Inverter Fed Induction Motor
Seshagiri Boppana1, B.N.CH.V. Chakravarthi2, T. Suresh Kumar3
1B. Seshagiri, Asst. Prof, EEE Dept, Vishnu Institute of Technology, Vishnupur, Bhimavaram, (W.G), India.
2B.N.CH.V. Chakravarthi, Asst. Prof, EEE Dept, Vishnu Institute of Technology, Vishnupur, Bhimavaram, (W.G), India.
3T. Suresh Kumar MIEEE, Assoc. Professor and Head, EEE Dept, Vishnu Institute of Technology, Vishnupur, Bhimavaram, (W.G), India.
Manuscript received on July 26, 2013. | Revised Manuscript received on August 12, 2013. | Manuscript published on August 30, 2013. | PP: 248-252 | Volume-2, Issue-6, August 2013. | Retrieval Number: F2055082613/2013©BEIESP
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© The Authors. Blue Eyes Intelligence Engineering and Sciences Publication (BEIESP). This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/)
Abstract: In past decades, a simple L-C filter can reduce harmonics for low power inverters, for medium and high power applications the size of L-C filter is bigger, Latter Pulse Width Modulation (PWM) techniques are implemented for medium power, but these are limited by the switching losses with high operating frequency. The limitation of PWM can be overcome by Multi Level Inverter (MLI). Again these MLI are fed by separate DC sources, which are operated at fundamental frequency, the design and control are complex with the increase in number of levels. In this paper, a power frequency square wave VSI with series compensators is fed for high power Induction Motor Drive. The series compensators produce voltages at harmonic frequencies and are injected in reverse direction; the net effect causes pure sinusoidal waveform. The DC bus voltages required for series compensators are less in magnitude and operated at harmonic frequency. This strategy improves the conversion efficiency of square wave VSI. The compensators used are of single phase H-Bridge inverters with high frequency switches (IGBT).
Keywords: Induction Motor, Series Compensators, Harmonic Voltages, High Power Square Wave.