A simplified three phase PWM rectifier with fixed frequency modulation
19 Apr 2010-Vol. 5, pp 83-87
TL;DR: In this article, a fixed frequency modulation scheme for a three-phase PWM rectifier operating at unity power factor is proposed, which provides a constant and reduced switching frequency for all the switches of the rectifier by controlling the occurrence and duration of the zero vector states indirectly.
Abstract: This paper proposes a fixed frequency modulation scheme for a three-phase PWM rectifier operating at unity power factor. It provides a constant and reduced switching frequency for all the switches of the rectifier by controlling the occurrence and duration of the zero vector states indirectly. The two legs of the converter are operated in hysteresis current tracking mode and the third leg is controlled by a square pulse of user-defined frequency. The low harmonic distortion and high input power factor are added advantages of this scheme. Also, it offers simplicity, fast response and robustness. The feasibility of the proposed method is verified through extensive simulation results.
References
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TL;DR: Current control techniques for three-phase voltage-source pulsewidth modulated converters, including bang-bang (hysteresis, delta modulation) controllers and predictive controllers with on-line optimization are reviewed.
Abstract: The aim of this paper is to present a review of current control techniques for three-phase voltage-source pulsewidth modulated converters. Various techniques, different in concept, have been described in two main groups: linear and nonlinear. The first includes proportional integral (stationary and synchronous) and state feedback controllers, and predictive techniques with constant switching frequency. The second comprises bang-bang (hysteresis, delta modulation) controllers and predictive controllers with on-line optimization. New trends in current control-neural networks and fuzzy-logic-based controllers-are discussed, as well. Selected oscillograms accompany the presentation in order to illustrate properties of the described controller groups.
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TL;DR: The author provides a guideline and quick reference for the practicing engineer to decide which methods should be considered for an application of a given power level, switching frequency, and dynamic response.
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"A simplified three phase PWM rectif..." refers background in this paper
...The predictive controller calculates the converter voltage vector once in every sample period to force the current to track the current command [3], [4]....
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"A simplified three phase PWM rectif..." refers background in this paper
...In the case of space vector modulation [6]-[8] the definition of 3-D vectors, identification of adjacent switching vectors in the 3-D space, and switching vector sequencing are needed....
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