Improved direct torque control of induction motor with dither injection::
Direct Torque Control (DTC) is a well-known control scheme for inductionmotor (IM) drives (Behera & Das 2006). Three-phase three-level Neutral Point Clamped (NPC) inverter is used for driving the induction motor in high power applications. Three-level NPC converter-fed direct torque controlled induction motor drive ensures fast dynamic control of the drive even under the low switching frequency operation. The source of delay is Hall Effect sensor and data acquisition system. Thus, the presence of delays in measurement and computation leads to low switching frequency resulting in increased torque and flux ripples. In addition, the drive produces acoustic noise. The injection of dither signals of suitable magnitudes and
frequencies in the torque and flux errors can reduce the torque ripples and acoustic noise in the drive. Mainly dithering is required to improve the switching frequency of inverter
index terms: Direct torque control; dither injection; induction motor drives;
three-level converte
Improved direct torque control of induction motor with dither injection
