| 摘要 |
PURPOSE: To detect the service interruption of a system by shifting reactive power in the lead or the lag direction in accordance with the rise and fall of a frequency and controlling an engine governor when the system is cut off to operate it in the direction in which the frequency and the voltage in single operation are diverged. CONSTITUTION: The different points from the prior art system interconnection system are as follows. The frequency is detected from the output voltage of a generator by a frequency detector 21 to output a reference reactive power Q* through a function generator 22. In order to make reactive power Q detected by a reactive power detector 23 accord with the reference reactive power Q*, a voltage control loop constituted of a voltage control circuit 9 adopting the output of a reactive power control circuit 24 as a reference voltage V* and a speed control loop for controlling the speed of a governor 11 by an effective power control circuit 27 by comparing the output P of an effective power detecting circuit 26 with a reference effective power P*. Single operation is detected by a frequency rising relay 16 and a shortage voltage relay 18. |
