Overmodulation and six-step mode for observer-based V/Hz control

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final_Iaderosa_Angelica_2023.pdf (4.15 MB)

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Sähkötekniikan korkeakoulu |
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Date

2023-02-03

Department

Major/Subject

Electrical Power and Energy Engineering

Mcode

ELEC3024

Degree programme

AEE - Master’s Programme in Automation and Electrical Engineering (TS2013)

Language

en

Pages

44+2

Series

Abstract

This thesis deals with the control of electrical machines in the overmodulation range. The goal is to have a stable control system able to exploit the full potential voltage of the inverter. After a brief explanation of the system model, the overmodulation algorithm is described. This method allows to have a smooth transition between the linear operation to the extreme operating condition in which the maximum voltage is produced. A synchronized PWM approach is adopted in order to reduce the harmonic spectrum throughout the whole operation. A scalar control based on a flux observer is considered thanks to its stability and its compatibility with the maximum voltage operation. Results show the feasibility of the overall system, six-step mode is able to increase the reachable speed while lowering the currents.

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Supervisor

Hinkkanen, Marko

Thesis advisor

Tiitinen, Lauri

Keywords

six-step mode, overmodulation, observer-based V/Hz control, PWM

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https://urn.fi/URN:NBN:fi:aalto-202302122064

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[final] Final projects