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A Dense Multilevel 24-sided Polygonal Voltage Space Vector Structure for IM Drive with Open-end Winding Configuration

A multi-level inverter circuit for generation of a dense multilevel 24-sided polygonal voltage space vector structure (VSVS) with real active vectors is proposed in this paper for open-end winding configuration induction motor (OEIM) drive. Generation of real active vectors compared to the switched average vectors, reduces switching frequency and improves phase voltage quality. Dense structure allows to generate 24-stepped output voltage waveform in full speed range with approximately 2Hz resolution. Due to 24-stepped waveform, output voltage is free from lower order harmonics upto 19th order in full speed range. The proposed inverter consists of inverter-1 and inverter-2, feeding from both the ends of the motor. The DC sources for the inverter scheme are generated by using simple delta-star-delta transformer connections while providing isolation from the grid. Capacitors in the power circuit are balanced using pole voltage redundancies without employing any extra circuit. The effectiveness of the proposed scheme is verified using MATLAB simulation and results are in agreement with the proposed theory.