Stabilizing of a Synthetic Loading Test Rig for Large Induction Machines

This paper analyzes the possible causes of power oscillation through the driver motor of a dual system synthetic loading experiment. Since the experimental results do not match the results from simulation it is necessary to study the causes in order to compensate for this phenomenon. It is shown that there are several factors which can be responsible. The electrical direct axis of the machines have to be aligned and that can be achieved with a phase delay in the excitation. The magnitude and shape of the excitation is also shown to contribute to the effect, and we can prove it through parameter sensitivity analysis. Finally a control strategy is proposed which optimises the oscillations to within 8% instead of over 30% at start.