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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 successive changing operating conditions to the DC drive: a step change in speed reference and a step change in load torque.
Replace the block named wref(rad/s) and the block named Load_torque(N.m) in the diagram by two Simulink step blocks with different starting times. The speed reference steps from 120 rad/s to 160 rad/s at t = 0.4 s and the load torque steps from 5 N.m to 25 N.m at t = 1.2 s. The final state vector obtained with the previous simulation can be used as initial condition so that the simulation will start from steady-state. Load the psbdcdrive_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 DC motor drive to successive changes in speed reference and load torque is shown in Figure 2-16.
Figure 2-16: Dynamic Transient of the DC Motor Drive
References
[1] Leonhard,W. Control of Electrical Drives. Springer-Verlag, Berlin 1996.
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