| 摘要 |
PROBLEM TO BE SOLVED: To securely realize the compatibility of pull-in at the time of starting and the suppression of frequency fluctuation at the time of a regular operation, and to synchronously operate a plurality of inverters in parallel without adding a special signal line. SOLUTION: An output frequency characteristic against effective power which an effective power operation part 111 calculates is divided into that at the time of starting and that at the time of a regular operation in a starting time frequency setting part 12 and a regular operation time frequency setting part 113. A frequency switching part 114 changes over them by a starting signal Gst and they are used for the voltage control of inverters. Thus, the compatibility of pull-in at the time of starting and the suppression of frequency fluctuation at the time of the regular operation is realized. Thus, a plurality of inverters 1-1 and 2-1 can synchronously be operated without adding a special signal line. |
