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Table 5 Comparison between our proposal and DTC using 2LVSIs

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