Current system compensation at post-fault conditions in six-phase frequency induction drive

Aurelijus Pitrėnas

Doctoral dissertation

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The dissertation deals with six-phase induction motor control problem using six-phase frequency converter with embedded system. The main aim of the disserta-tion is to develop control method capable to compensate over-currents during post-fault conditions and the stator current vector elliptical trajectory of six-phase frequency induction drive.

The work approaches the following tasks: creation of six-phase inverter si-mulation model; simulation and experimental studies of six-phase frequency converter and its control algorithm; creation of six-phase induction frequency drive simulation model and research of transients; experimental studies of six-phase induction frequency drive at different supply voltages loads.

The dissertation consists of an introduction, three chapters, general conclu-sions, references and list of the publications by the author on the dissertation topic and three annexes.

The introduction reveals the investigated problem, importance of the work and the object of research, describes the purpose and tasks of the paper, research methodology, scientific novelty, practical significance of results and presents the defended statements of dissertation. The introduction ends in presenting author’s publications on the subject of the defended dissertation, offering the material of made presentations in conferences and the structure of the dissertation.

The first chapter is devoted to a review of the literature. It outlines the ad-vantages and disadvantages of multi-phase motors. Mathematical model of six-phase induction motor and control methods of six-phase induction frequency drives presented. The chapter ends with conclusions and formulated tasks for the dissertation.

The second chapter presents operation principle of six-phase frequency converter; also the delay circuits of transistor control signals are investigated. The simulation model of six-phase induction frequency drive and control algo-rithm of six-phase frequency converter are presented. At the end of the chapter, conclusions are formulated.

The third chapter introduces experimental studies of six-phase frequency converter. The experimental studies of six-phase induction frequency drive at different supply voltages, frequency and different loads are presented. At the end of the chapter, conclusions according experimental results are formulated.

The results of the work were presented in 7 scientific articles: three – pub-lished in peer-reviewed scientific journals, four – in other publications. Seven reports were presented on the subject in conferences at national and international levels.

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145×205 mm
140 p.
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