Robust, harmonic-injection system for single-switch, three-phase

Electric power conversion systems – Current conversion – With means to introduce or eliminate frequency components

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323222, H02M 112

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active

058479449

ABSTRACT:
In a single-switch, three-phase DCM boost rectifier, a voltage signal proportional to the inverted ac component of the rectified, three-phase, line-to-line input voltages is injected as a modulating signal into the control circuit to vary the duty cycle of the rectifier within one line cycle. As a result of its generation method, the injected signal is naturally synchronized with the three-phase, line-to-neutral input voltage. In addition, the injection method of this invention does not affect the closed-loop feedback control of the DCM boost rectifier since the injected signal is generated in an open-loop fashion. Three alternative methods to generate the injection signal are described. One method uses three low-frequency, step down transformers in generating the injection signal. The other two methods use operational amplifiers instead of the transformers.

REFERENCES:
patent: 5406189 (1995-04-01), Wohlberg et al.
A.R. Prasad, et al., An Active Power Factor Correction Technique for Three-Phase Diode Rectifiers, pp. 58-65, 1989 IEEE.
Simonetti, et al., Single-Switch Three-Phase Power Factor Preregulator Under Variable Switching Frequency and Discontinuous Input Current, pp.657-662, 1993 IEEE.
Kolar, et al., Space Vector-Based Analytical Analysis of the Input Current Distortion of a Three-Phase Discontinuous-Mode Boost Rectifier System, pp. 696-703, 1993 IEEE.
Qihong Huang, et al., Harmonic Reduction In a Single-Switch, Three-Phase Boost Rectifier with High Order Harmonic Injected PWM.sup.1, Virginia Power Electronics Center, The Bradley Dept. of Elect. Engineering, Virginia Polytechnic Institute and State University, Blacksburg, VA 24061.
International Standard, The American National Standards Institute (ANSI) is the primary source and official sales agent, through their U.S. National Committee, Ref. No. CEI/IEC 555-2: 1982.
Jian Sun, et al., Harmonic Reduction Techniques for Single-Switch Three-Phase Boost Rectifiers, pp. 1225-1232, 1996 IEEE.

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