In this work, a multi-level 42-sided polygonal space vector structure
(SVS) for suppression of lower order harmonics for Open-End Induction
Motor(OEIM) drive applications is proposed. The proposed power circuit
topology consists of two inverters feeding an Open-End Induction Motor
from either side. The main inverter fed with a single DC link providing
active power for motor operation is switched at low switching frequency.
The secondary inverter fed with a capacitive supply is switched at high
frequency to suppress lower order harmonics upto 39th order, up to the
base speed of operation allowing maximum utilization of the DC link. The
advantages of lower order harmonic suppression in motor phase voltage,
for polygonal space vector structures are combined with multi-level
inverter topology. This results in lower switching losses in low
frequency switching main inverter and low voltage secondary inverter.
Use of a single DC link facilitates fourquadrant operation of the
inverter. The proposed scheme is validated for steady state and dynamic
performance by experimental results.