SimPowerSystems

Speed Regulation Dynamic Performance

You 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.

Use the Reference Speed Selection switch and the Torque Selection switch to set 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 init_ACdrive.mat file, which creates the xInitial variable. Select the Workspace I/O --> Load from workspace --> Initial state check box in the Simulation parameters dialog and restart the simulation.

The response of the induction motor drive to successive changes in speed reference and load torque is shown here:

Figure 2-26: 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, N.J., 1986.

Steady-State Voltage and Current Waveforms

HVDC System