| 摘要 |
PROBLEM TO BE SOLVED: To obtain an uninterruptive power supply which can stably operate a generator even in the case of switching to an auxiliary generator when commercial power supply is interrupted. SOLUTION: A voltage generator 842 output a DC voltage command that α(a control delay angle) becomes larger than 120 deg. when a rectifier is interrupted. A full-wave rectifier 841 outputs a DC voltage command in a stationary state. Change-over from the voltage generator 842 to the full-wave rectifier 841 is performet through a filter 844, thereby relieving the changing speed of the DC voltage command. As a result, the DC voltage gradually increases, and the rapid increase of a load of a generator can be prevented. |
