| 摘要 |
PURPOSE:To restrain effects on a load and a control system by a method wherein the output of a constant voltage control system upon individual operation is made zero and the output is added with a preset value while a control system is switched instantaneously from effective/ineffective power control into a constant voltage control by a switch simultaneously with the system parallel-off. CONSTITUTION:When an inverter is released from a system and the operation of the same is shifted from interlocking operation into individual operation, the output of a voltage control device 7 is added with a control amount corresponding to 50% load operation upon the individual operation, for example, by an initial setter 4 whereby the fluctuation becomes a value corresponding to the 50% load fluctuation at maximum to a constant voltage control system and non-instantaneous switching of a control system is permitted when the control system is switched by switches 8A, 8B, 9, 16 and the like. In this case, the output of the voltage control device 7 is reduced into zero. According to this method, effects on the load and the control system can be minimized. |
