A Fifteen Concentric 30-sided Polygonal Space Vector Structure Using a Single DC-link for OEIM drive

Polygonal Space Vector Structures (SVS) are the spearhead choice to obtain distortion-less, ripple free output voltage waveform across the machine phase winding. A dense (15-concentric) 30-sided polygonal SVS using a single DC-link is presented in this paper. The proposed SVS eliminates lower order harmonics till $25^{\mathrm {t}\mathrm {h}}$ order from motor phase voltage, throughout the modulation range. The realization of the proposed SVS for an Open End Induction Machine (OEIM) drive is achieved by using a primary inverter (supplies active power for the drive operation) and a secondary inverter (acts as a switched capacitive filter). The primary inverter is a 3-Level Flying Capacitor (FC) inverter which is connected with an active DC source and the secondary inverter is a capacitor fed FC inverter cascaded with a capacitor fed H-bridge inverter. The proposed scheme is verified in steady and transient states through simulation and is validated by experimental results.