NDLI: Synchronized scheme of continuous space-vector PWM with the real-time control algorithms

Content Provider	IEEE Xplore Digital Library
Author	Oleschuk, V. Blaabjerg, F.
Copyright Year	2004
Description	Author affiliation: Power Eng. Inst., Acad. of Sci., Kishinau, Moldova (Oleschuk, V.)
Abstract	This paper describes in details the basic peculiarities of a new method of feedforward synchronous pulsewidth modulation (PWM) of three-phase voltage source inverters for adjustable speed ac drives. It is applied to a continuous scheme of voltage space vector modulation. The method is based on a representation of the pulse patterns as a function of the fundamental and switching frequencies of the drive system. Accurate trigonometric algorithms of vector PWM have been analysed, and also compared with the algebraic ones based on linear approximation of the durations of active switching states from their position inside clock-intervals. In order to provide smooth shock-less pulse-ratio changing and quarter-wave symmetry of the voltage waveforms, special synchronising signals are formed on the boundaries of the 60/spl deg/ clock-intervals. The process of gradual transition from continuous to discontinuous synchronous PWM at higher values of the fundamental frequency has also been described. Results of analysis of the spectral characteristics of the output voltage of the inverter show advantage of synchronous PWM in comparison with conventional asynchronous modulation at low indices of the frequency ratio between the switching and the fundamental frequency. Special attention has been given to the analysis and comparison of the computational effectiveness of the proposed algorithms of synchronized modulation.
Sponsorship	IEEE Power Electon. Soc
Starting Page	1207
Ending Page	1213
File Size	450640
Page Count	7
File Format	PDF
ISBN	0780383990
ISSN	02759306
DOI	10.1109/PESC.2004.1355594
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2004-06-20
Publisher Place	Germany
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Space vector pulse width modulation Pulse width modulation inverters Voltage Pulse width modulation Frequency synchronization Algorithm design and analysis Clocks Pulse inverters Switching frequency Approximation algorithms
Content Type	Text
Resource Type	Article

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