SimPowerSystems

Speed Regulation Dynamic Performance

You 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.

Click the Torque Selection block to activate the load torque steps from 5 N.m to 25 N.m at t = 1.2 s. The speed reference steps from 120 rad/s to 160 rad/s at t = 0.4 s can be achieved by a Step block. The final state vector obtained with the previous simulation can be used as the initial condition so that the creates the xInitial variable. Select the Workspace I/O --> Load from workspace --> Initial state check box in the Simulation parameters window and restart the simulation.

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

Figure 2-15: Dynamic Transient of the DC Motor Drive

References

[1] Leonhard,W., Control of Electrical Drives, Springer-Verlag, Berlin, 1996.

Steady-State Voltage and Current Waveforms

Synchronous Machine and Regulators