| 摘要 |
PROBLEM TO BE SOLVED: To control input and output waveforms to sine waves while reducing a common mode voltage and harmonics of input and output voltages and suppressing pulsation. SOLUTION: The PWM control of a bi-directional switch of a three-phase/three-phase AC-DC direct converter 3 is performed by a direct AC-AC conversion type spatial vector modulation method. The state of a basic vector obtained by developing a line voltage of a three-phase AC output on a two-phase staticαβaxis is four simple oscillation vectors VXmax, VXmid, VYmax and VYmid and one zero vector Vz, and the duty is determined from input current command values Iiα*, Iiβ*, output line voltage command values Volα*, Volβ*, and an input voltage detection value Vi and an output current detection value Io developed on the staticαβaxis. The selection of three simple oscillation vectors, a zero vector Vz and a rotation vector Vrot, and the selection of two rotation vectors, a zero vector Vz and two simple oscillation vectors inserted between two rotation vectors are also included. COPYRIGHT: (C)2008,JPO&INPIT
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