Current Model Flux Estimator for the IM - The Rotor Flux Estimator - Engineering Assignment Help

Assignment Task:

Current Model Flux Estimator for the IM

Home Assignment: 

H3.1) Derive the current model flux estimator in IFO and make a block diagram over the field- oriented drive with the current model flux estimator in IFO instead of using the rotor flux measurement in the induction machine. 

H3.2) Make a block diagram over a speed controller (without current limitation and active damping) for the field-oriented drive in H3.1) and derive the parameters for it, put αc=20 rad/s and use B from Ass1. Present the speed regulator values numerically. 

H3.3) Add a torque limitation of 30 Nm, active damping and anti-windup to the speed controller in H3.2. Derive the parameters for this controller, put αc=20 rad/s and use B from Project Ass1. 

H3.4) Copy the files from assignment 2 to a new directory and start to implement the changes. 

Project Tasks: 

Ass3.a) Implement a current model rotor flux estimator instead of using the flux sensor and check that the performance of the drive is unchanged. 

Ass3.b) Investigate the influence of parameter errors on the performance of the rotor flux estimator, introduce error in L?M and R?R, take one at the time. 

Ass3.c) Implement the speed controller in H3.2). Magnetize the machine and make a speed step up to 1435 rpm at 1 s, apply an extra shaft torque step of 14.6 Nm after 1.5s. Study the performance of the drive and compare with the open-loop control in Ass1.d. Did you get the desired time constant of the speed response? 

Ass3.d) The drive is now connected to a load with an inertia of 0.4, without changing the speed regulator form the original one. Put the voltage limit to 10 times the given value. Any comments on the speed response? 

Ass3.e) Implement the speed controller in H3.3) and redo Ass3.c). Compare the performance of the two controllers. Also redo Ass3.d), but for this put the torque limit to infinity (=inf in Matlab), compare the results. 

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