Project 2 - Modeling of 3 phase Induction Motor Drive

EV Refresher

Batch-5

Direct Torque Control Method of Indution motor

Initially we are taking the 3 Phase supply and converting it into DC using the Diode rectifier

3-phase Supply voltage

By using the DC link capacitor and Braeaking chopper the DC voltage at the input of inverter can be maintained Smooth and Constant voltage .

The Two Level inverter is used to convert the DC in top 3 phase AC

The ouput of inverter is given to the 3 phase Induction motor

Controll part

By using the 3-phase supply i.e., voltage and current we can estimate the Flux and Electrical torque generated.

initially we are converting 3 phase to 2 pase i.e., to alpha and beta. Multiplying the current with stator resistance we can get the volatge drop andsubtracting it with the supply voltage we can get the applied voltage.

By using the descrit intigrator we can get the Flux in d and q. By using phid,phiq,id and Iq we can calculate the Electrical torque can be generated i.e., Te_cal. By using the hypot block and atan2 block we can generate the Flux magnitude and angle.

By using the actual speed and referance speed we can generate the Referance Torque

By using the referance torque, torque calculated, Phi referance and Phi magnitute we can generate the control order. this is the controlling of Flux.

By using Phi angle we can estimate the sector. by sector and control order we can generate the vector. From vector we can generate the Gate pulses.

According to the magnitude of the torque and flux the sector is going to deside

Final model

Results

We can observer that Referance torque and torque generated are almost equal.