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In this paper a three-phase three-level Neutral Point Clamped (NPC) inverter is used for driving Induction Motor (IM) operating under Direct Torque Control (DTC) scheme. The three-level NPC inverter has 27 combinations of switching states. However, there are redundancies in these combinations and only 19 voltage vector are considered in the order to minimize the Common Mode (CM) voltage stress on...
In this paper, a three-level inverter fed induction motor drive operating under Direct Torque Control (DTC) is presented. DTC do not show good performance in low speed region due to stator flux demagnetization that relates to variation in stator resistance. Here, a sinusoidal wave is used as dither signal of minute amplitude (for torque hysteresis band and flux hysteresis band respectively) in the...
This paper aims at the following control schemes of the IPM-SM drive, (i) A closed-loop direct torque control of an IPM-SM for variable speed drive with speed/position sensor, (ii) A speed and position sensor-less direct torque control scheme of the IPM-SM drive. To achieve closed loop control of torque and stator flux linkage, two PI controllers has been used; whereas to generate reference voltage...
This paper presents a three-level neutral point clamped (NPC) inverter fed induction motor for high power traction applications in Indian Railway Technology. This drive is operated under direct torque control (DTC) method, and it is well known for faster torque and flux control system. This method is simple to implement but DTC do not show good performance in low speed region due to two reasons. First...
In this paper, a three-level inverter-fed induction motor drive operating under Direct Torque Control (DTC) is presented. A triangular wave is used as dither signal of minute amplitude (for torque hysteresis band and flux hysteresis band respectively) in the error block. This method minimizes flux and torque ripple in a three-level inverter fed induction motor drive while the dynamic performance is...
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