| 摘要 |
<P>PROBLEM TO BE SOLVED: To attain precise control of a power conversion device regardless of any situation by preventing that the restriction of the upper and lower limits of an output voltage makes it impossible to detect a current. <P>SOLUTION: This power conversion device is provided with a PWM conversion means which compares a 3-phase voltage command with a triangular wave carrier signal, a power converter which drives a switch element on the basis of a PWM pulse to convert power between DC power and 3-phase AC power, a current detection means which detects a pulsed current passing through the DC bus conductor of a main circuit, and a voltage command correction means which corrects the 3-phase voltage command. When the momentary values of the 3-phase voltage command are set to be a maximum phase, intermediate phase, and minimum phase in the decreasing order thereof, the voltage command correction means corrects the 3-phase voltage command so that the line voltage value between the maximum phase and the intermediate value and that between the intermediate phase and the minimum phase become predetermined values or more. When the voltage command is not included between an allowable upper-limit value and lower-limit value, not only a maximum phase voltage command and/or minimum phase voltage command but also an intermediate phase voltage command are corrected. <P>COPYRIGHT: (C)2010,JPO&INPIT |
