| 摘要 |
<P>PROBLEM TO BE SOLVED: To prevent controllability from declining due to model prediction control referring to an output value of an integral element using the difference between a control quantity and its command value as input if a modulation ratio becomes excessively large. <P>SOLUTION: A voltage vector V(n+1) expressing a next operational state of an inverter is determined to be a voltage vector making an evaluation function J minimum in a step S20. Here, a deviation edq(n+2) is the difference between prediction current ide(n+2), iqe(n+2) temporarily set as the next operational state and command current idr, iqr. In addition, a temporary integral value Int is a value obtained by adding a value of the deviation edq(n+2) multiplied by gain Ki to an output value of the integral element (integral value In) using a deviation caused by voltage vectors employed until the previous time as input. At a step S28, if it is determined that a modulation ratio M is equal to or more than a threshold value Mth, update of the integral value In is prohibited. <P>COPYRIGHT: (C)2013,JPO&INPIT |
