| 摘要 |
<p>PURPOSE:To prevent the rotating speed of an AC exciting synchronous machine from abnormally rising at the time of a set power abrupt change or a system trouble or the like by reducing the control gain of a cycloconverter if the rotating speed of the machine rises its specified speed or more, and returning the gain of the cycloconverter to its normal set value if its speed falls its specified speed or less. CONSTITUTION:An automatic load regulator 6 or 15 controls the secondary excitation cycloconverter 4 of an AC exciting synchronous machine 1 in response to a deviation between an output set value P0 and the power value P of the machine 1. On the other hand, a guide vane is controlled by a deviation between guide vane openings GVO and GVO0 responsive to a deviation between a rotating speed command N0 and a rotating speed N. Here, when the rotating speed is a specified speed or more, the regulator 15 is selected, the control gain of the cycloconverter 4 is reduced, while when it is the specified speed or less, the regulator 6 is selected, and the control gain of the cycloconverter 4 is returned to its normal value.</p> |
