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Continuous Synchronous Pulsewidth Modulation With Improved Computing Effectiveness
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| Author(s) |
Valentin Oleschuk, Vasilii Ermuratski, Eduard M. Chekhet |
| 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. Accurate trigonometric
algorithms of vector PWM have been analysed, and also
compared with the algebraic ones based on linear
approximation of the typical function of durations of active
switching states from their position inside the clock-intervals. To
provide smooth shock-less pulses-ratio changing and quarterwave
symmetry of the voltage waveforms, special synchronising
signals are formed on the boundaries of the 600 clock-intervals.
The process of gradual transition from continuous to
discontinuous synchronous PWM at higher value of the
fundamental frequency has also been described. Special
attention has been given to analysis and comparison of
computational effectiveness of the proposed algorithms of
synchronised modulation. |
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| Filename: | A32229 |
| Filesize: | 200.1 KB |
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| Type |
Members Only |
| Date |
Last modified 2006-02-16 by System |
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