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Speed Regulation Dynamic Performance
We can study the drive dynamic performance (speed regulation performance versus reference and load torque changes) by applying two changing operating conditions to the drive: a step change in speed reference and a step change in load torque.
Replace the Constant wref and Load_torque blocks in the psbacdrive.mdl
diagram by two Simulink step functions with different starting times.
The speed reference steps from 120 rad/s to 160 rad/s at t = 0.2 s and the load torque steps from 0 N.m to 200 N.m at t = 1.4 s. The final state vector obtained with the previous simulation can be used as the initial condition so that the simulation will start from steady-state. Load the psbacdrive_init.mat
file, which will create the xInitial variable. Select Workspace I/O/Load from workspace/Initial state in the Simulation Parameters window and restart the simulation.
The obtained response of the induction motor drive to successive changes in speed reference and load torque is shown in Figure 2-27.
Figure 2-27: Dynamic Performance of the Induction Motor Drive
References
[1] Leonhard W., Control of Electrical Drives. Springer-Verlag, Berlin 1996.
[2] Murphy J. M. D. and Turnbull F. G., Power Electronic Control of AC Motors. Pergamon Press, Oxford 1985.
[3]
Bose B. K., Power Electronics and AC Drives. Prentice-Hall. Englewood Cliffs 1986.
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