| 摘要 |
PROBLEM TO BE SOLVED: To provide a self-excited power conversion device capable of smoothly conducting power running/regenerative operation in a DC feeder system. SOLUTION: The voltage criterion of a control circuit 200 which conducts the voltage control of a converter device 22 used in this self-excited power conversion device is switched according to power running/regenerative operation mode. A value of a regenerative DC voltage criterion 210 is set so as to be larger than a power running DC voltage criterion 211. The polarity of a DC detection signal detected by a DC detector 27B is determined. If positive, it is considered as power running and, if negative, it is considered as regenerative operation. Selective switching is conducted between the power running DC voltage criterion 211 and the regenerative DC voltage criterion 210 by a switch 212. For smooth switching, a primary time-lag circuit 213 is inserted into a control loop. COPYRIGHT: (C)2004,JPO
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