Transient behaviour of induction motors in island conditions due to interruptions in the ship’s electrical power supply
Tutor / director / evaluatorCasals Torrens, Pau
Document typeBachelor thesis
Rights accessOpen Access
The focus present dissertation was a problem that occurs in industrial installations and ships. The said installations experience overvoltage in case of power cut. This problem is a result of installing capacitive compensation parallel to motors. This dissertation studied this problem with two different electric motors widely used in big installations. The motors were tested in laboratory in different operational conditions; with different connections (D and WYE), with different loads and without load and with and without capacitive compensation. The capacitor bank, source of capacitive compensation, was also connected in D and WYE during the tests. The overvoltage was observed with capacitive compensation only when the capacitor bank was connected in D and the motors were connected in WYE. The mechanical load on the shaft has determined the peak value of the transient voltage and the duration of the waveform. The laboratory testing circuits, in which the overvoltage was observed, were recreated in Matlab to validate the results obtained in real-world. The simulation results were very similar to their real-world counterparts in 3 of the 4 cases. In conclusion, the overvoltage has manifested when the voltage received by the capacitor bank was superior than the motor’s. The load has also played an important role in determining the peak value of transient of waveform.