A Multilevel 30-sided Space Vector Structure Generation for an Induction Motor Drive Using a Single DC-link

This paper proposes the generation of a multilevel 30-sided space vector structure (SVS) from a single DC-link for an open-end induction motor (OEIM) drive. This scheme exhibits the inherent advantages of multilevel inverters like usage of low voltage blocking switches, less dv/dt in phase voltage etc. As the SVS generated is a 30-sided, lower order harmonics till 25
^th
order is eliminated from the motor phase voltage. Linear modulation range is also extended till 99.63% of the base speed as the SVS is closer to a circle. The topology consists of a DC-link fed hybrid 5-level inverter feeding one end of the OEIM and a capacitor fed hybrid 5-level inverter feeding from the other end of the OEIM. Active DC-link fed inverter acts as the only source of active power while the inverter feeding from the other end acts as a switched harmonic filter. Simulation studies and experimental verification of the proposed scheme are performed and presented in this paper.