Field Oriented Control of the IM Using Rotor Flux Sensors - Engineering Assignment Help

Assignment Task :

Home Assignment:
H1.1) Make a block diagram, implementable in Simulink, of a field-oriented control of the induction machine, using DFO. The controller should have torque reference and flux magnitude reference as inputs, feed forward of the back emf, active damping and no voltage limitation. Use the rotor flux sensor for the determination of the transformation angle. Use amplitude invariant transformations.
H1.2) Derive the parameters for the current controllers using αc=1000 rad/s, present the values numerically.
H1.3) Draw the additional blocks you need, to limit the voltage and to have anti-windup of the integrator. Derive the anti-windup function.
H1.4) Copy the files from assignment 1 to a new directory and start to implement the changes, use B from assignment 1, put Tload_extra=0.

Project Tasks:
 
Ass1.a) A rotor speed sensor as well as a sensor measuring the rotor flux is available. Your task is to implement a torque-controlled electric drive system with a rotor flux reference input. The flux level can be controlled in an open-loop manner, put ???????? to 1000 rad/s. Also use feed-forward of the rotational emf.

Ass1.b) First magnetize the machine to the value: Ψ∗????=0.934, after this (approximately after 1 second) a step in the torque reference of 12 Nm is applied. After 2 s an additional reference step of 8 Nm is applied for 0.1s. Is the response of the current controller as expected? Compare the start of the machine (speed and torque performance) with the previous direct start, any differences? What is the peak voltage to the machine? Are the steady state values of the motor as expected?
Ass1.c) Maximum available voltage is 440 V RMS line-to-line. Implement this limitation and redo Ass2.b. Is the result the same? Why? How is the current controller behaving, check the output before the voltage limiter and the integrator contribution to the voltage reference?

Ass1.d) Implement the anti-windup function and redo the simulation. How is the response of the current controller changed?

Ass1.e) Investigate the behavior of the current controller when removing the decoupling term.

Ass1.f) Investigate the influence of the feed forward of the back emf and the active damping on the performance of the current controller, start by removing both. (Do not forget to change the integral part of the current controller when removing the active damping)

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