| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To perform excellent power conversion between a power converter and a three-phase AC system by using vector control even when voltage in a power system is three-phase unbalanced because of a system accident and so on. <P>SOLUTION: A control device for a power converter connected to a three-phase AC power system comprises: a reverse-phase coordinate conversion circuit calculating reverse-phase d-axis current and reverse-phase q-axis current by performing dq vector coordinate conversion on output current in a reverse-phase rotation direction of system voltage of the three-phase AC power system; a first current controller controlling command values of the reverse-phase d-axis current and the reverse-phase q-axis current by comparing the command values with the reverse-phase d-axis current and the reverse-phase q-axis current of the reverse-phase coordinate conversion circuit as feedback values; and a first oscillation component extraction circuit extracting a secondary oscillation component by positive-phase current included in the reverse-phase d-axis current and the reverse-phase q-axis current of the reverse-phase coordinate conversion circuit. The first current controller compares the current command value with the reverse-phase d-axis current and the reverse-phase q-axis current of the reverse-phase coordinate conversion circuit after excluding the extracted secondary oscillation component by the positive-phase current from the reverse-phase d-axis current and the reverse-phase q-axis current. <P>COPYRIGHT: (C)2013,JPO&INPIT</p> |
