Abstract:
This paper proposes a novel predictive control strategy for a multilevel
inverter fed Induction Motor Drive (IMD) with optimal voltage vector
selection at every sampling interval. The proposed predictive control
strategy, apart from enhancing the dynamic speed and torque responses of
the drive, strives to reduce the number of switching transitions by choosing
optimal voltage vector, thereby reducing the switching losses significantly.
The algorithm put forth here chooses the most suitable switching state among
the redundant switching combinations, such that minimum number of
switches change their states from the previous switching combination to the
present one. This results in perceptible reduction in the switching losses
thereby increasing the efficiency of the converter. The proposed Predictive
Torque Control (PTC) strategy is modeled and simulated in Matlab/
Simulink environment and the results are reported for a 2-level and 3-level
inverter fed IMD configurations. The results demonstrate the effectiveness of
the proposed PTC for both 2-level and 3-level inverter fed IMDs.
