From: Direct torque control of doubly fed induction motor using three-level NPC inverter
 | DTC for DFIM connected to two 2LVSIs | DTC for DFIM connected to two 3LVSIs | Improvement (%) |
---|---|---|---|
Torque ripple (N.m) | 2.612 | 0.982 | 62.40 |
Stator flux ripple (Wb) | 0.07 | 0.02 | 71.42 |
Rotor flux ripple (Wb) | 0.016 | 0.005 | 68.75 |
THD of stator current isa (%) | 8.75 | 1.57 | 82.05 |
THD of rotor current ira (%) | 9.87 | 1.52 | 84.59 |
switching frequency | Variable frequency of 4 kHz | Almost constant frequency of 2.9KHz | Switching frequency is mastered |