Electric power conversion systems – Current conversion – With means to introduce or eliminate frequency components
Patent
1998-08-04
2000-11-21
Han, Jessica
Electric power conversion systems
Current conversion
With means to introduce or eliminate frequency components
363 42, 363 43, 363 71, H02M 7521
Patent
active
061512273
ABSTRACT:
The controller for a power converter of the present invention:
calculates the range number in which the voltage command vector for a multi-level converter is present;
rotates the voltage command vector through a specified angle;
performs coordinate transformation of that vector to a vector in an oblique coordinate system which takes the vector in the a axis direction and a vector which has been rotated through a specified angle anti-clockwise from the a axis as two unit vectors;
splits the converter output-enabled portion of the vector diagram of the -30 degrees +30 degrees range of the spatial vector diagram in which output vector is positioned, which has undergone oblique coordinate transformation, into square-shape patterns so that the outputs vector is positioned in the upper left/the lower right/both the lower left and upper right of each square-shape pattern;
splits any square-shape pattern which holds the output vector in both its lower left and its upper right into two triangular domains by a segment which joins the upper left vertex and the lower right vertex;
judges in which square-shape pattern/triangular domain in the domain-split oblique coordinate system diagram the voltage command vector which has undergone oblique coordinate transformation is present; and
selects, rotates through a specified angle and calculates the output vector which corresponds to that domain.
REFERENCES:
patent: 4167775 (1979-09-01), Baker et al.
patent: 5132892 (1992-07-01), Mizoguchi
patent: 5566061 (1996-10-01), Uchino
patent: 5737206 (1998-04-01), Yamamoto
Miguchi Yasuhiko
Mizutani Mami
Han Jessica
Kabushiki Kaisha Toshiba
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