Control method for direct power converter

Details Control method for direct power converter Control method for direct power converter

2007-07-31

2010-10-26

Sterrett, Jeffrey L (Department: 2838)

Electric power conversion systems

Frequency conversion without intermediate conversion to d.c.

With automatic voltage magnitude control

C363S157000, C363S159000

Reexamination Certificate

active

07821802

ABSTRACT:
A power converter directly converting an AC voltage into an AC voltage of any desired magnitude and frequency by turning bidirectional switches ON and OFF without employing any energy buffer, where the peak values of output phase voltage command values are limited, to bring the amplitude of an output line voltage to, at most, 0.866 times the amplitude of the supply line voltages. By way of example, the peak-value limit of the output phase voltage command values is set so that the maximum value of the output phase voltage command values becomes, at most, 0.75 times the maximum value of supply phase voltages, while the minimum value thereof becomes, at least, 0.75 times the minimum value of the supply phase voltages. This control method for the direct power converter dispenses with an expensive dedicated motor, and permits a reduction in cost of the control apparatus as a whole.

REFERENCES:
patent: 4074348 (1978-02-01), Salzmann et al.
patent: 4652989 (1987-03-01), Kurosawa et al.
patent: 4833588 (1989-05-01), Schauder
patent: 5886893 (1999-03-01), Asai et al.
patent: 2009/0175059 (2009-07-01), Sakakibara
Jun-ichi Ito, Ikuya Sato, and Shigeo Konishi, “An Improved Method of Input and Output Waveforms for the Matrix Converter Based on Virtual AC/DC/AC Conversion” SPC-02-90/IDE-02-31, 2002, pp. 75-80.
Jun-ichi Itoh, Hirokazu Kodachi, Akihiro Odaka, Ikuya Sato, Hideki Ohguchi, and Hidetoshi Umida, “A High Performance Control Method for the Matrix Converter Based on PWM generation of Virtual AC/DC/AC Conversion” 2004, pp. 303-308.

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