Closed-loop control of a high-voltage induction machine using a high-voltage multi-level converter

Abstract

In this thesis, a complete set of hardware and software has been designed and implemented to interface a Neutral Point Clamped three level converter in order to perform a closed-loop control of a high voltage induction machine. The hardware design is related to the selection of the proper components for the correct communication with the PC, linkage to the NPC through fibre optic link, design of the filter stages, reading of the encoder signals and finally design and building of the PCB. The software carries out the development of the algorithms to implement the closed-loop control of a high voltage induction machine by reading the encoder attached to its shaft and controlling the currents flowing to the machine. The equipment used has been a 4kV, 36A high-voltage high-power supply unit to feed up the NPC converter capable to manage 4kV, 40A to control a high-voltage induction machine with rating 690Vph-ph, 45kW, 2pole, 50Hz, 2970rpm.