Single phase delta modulated inverter for uninterruptible power supply applications

Abdel-Rahim, Naser M. B. (1989) Single phase delta modulated inverter for uninterruptible power supply applications. Masters thesis, Memorial University of Newfoundland.

[English] PDF (Migrated (PDF/A Conversion) from original format: (application/pdf)) - Accepted Version Available under License - The author retains copyright ownership and moral rights in this thesis. Neither the thesis nor substantial extracts from it may be printed or otherwise reproduced without the author's permission. Download (26MB) [English] PDF - Accepted Version Available under License - The author retains copyright ownership and moral rights in this thesis. Neither the thesis nor substantial extracts from it may be printed or otherwise reproduced without the author's permission. (Original Version)

Abstract

This thesis examines in detail the suitability of Rectangular Wave Delta Modulation (RWDM) for Uninterruptible Power Supply (UPS) applications. -- Various types of Delta Modulation schemes commonly used in communication systems are presented with a view to selecting the appropriate modulation scheme for UPS applications. It is shown that RWDM posseses many attractive features which make it suitable for UPS applications: simple control circuitry, ease of control of the frequency spectrum of the modulator output through the variation of modulator parameters. -- An analytical model of the rectangular wave delta modulator is developed to qualitatively describe the effect of various modulator parameters on the modulator performance. A numerical approach based on Discrete Fourier Transform and harmonic analysis technique is proposed to quantitatively investigate the performance of the modulator. -- The effect of various modulator parameters on the single phase delta modulated UPS inverter with two commonly used load filters, namely L-C and tank circuit filter, is studied for various types of load. It is shown that RWDM provides significant improved performance in single phase delta modulated UPS inverter. It offers improved voltage utilization ratio, suppressed amplitudes of low order harmonics at the inverter output and hence a small filter size. -- Analytical expressions and computer simulation of voltages and currents in the load filter are provided. The predicted results are substantiated by corresponding experimental results.

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