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Master of Science Thesis in Electric Power Engineering - page 47 / 114

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VOLTAGE ORIENTED CONTROL – SIMULATION

Figure 3.25 : Controller simulation results

In the Figure 3.25, we observe a very high current when the system start (id reaches 70A), and we can see also a small overshoot on Vdc. This is due to the capacitor charging. Now we apply a small step on Vdc reference (50V), and we can see that the d current reaches the saturation limit (15A) when Vdc is increasing towards the reference value (450V). Finally, when Vdc reaches the reference value (without overshoot), the current is stabilize around 1.3A (steady state value).

DISCRETE SIMULATION

All the previous design and simulation have also been implemented in discrete time since the controller will be discrete in reality. You can find a discrete simulation of the controller (same scheme as Figure 3.24) in APPENDIX D.

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