| 摘要 |
PROBLEM TO BE SOLVED: To provide a control device, for a regenerative inverter, by which a voltage difference in a current zero point is excluded, by which a converter operation and a regenerative inverter operation can be shifted to each other smoothly. SOLUTION: A control device 20 which comprises a voltage control and adjustment part 11, a firing-angle limitation part 12 and a control-angle adjustment part 13 is provided with an automatic firing-angle limitation circuit 30 which is composed of a voltage-change correction part 21 in which system- voltage detection values VAC1 , VAC2 of a first AC power system 3 and a second AC power system 4 are converted respectively into DC voltages so as to find their voltage difference ΔV, of a gain adjustment part 25 for the obtained voltage difference and of a minimum-limitation-value correction part 31 in which a firing-angle correction value is added to the gain-adjusted voltage difference so as to be supplied to the firing-angle limitation part 12 as a firing-angle minimum limitation value βmin . Thereby, it is possible to exclude a voltage difference which is generated in the current zero point of the volt-ampere characteristic of a converter and of a regenerative inverter in association with a change in a system voltage. |
