| 摘要 |
PURPOSE:To continue as a reactive power regulator the operation of a self- excited power converter by switching the effective power control to a DC input constant-voltage control at the DC power source malfunction time when a DC power source and other different AC power source are interlocked. CONSTITUTION:The output of a converter 2 is interlocked through a transformer 3 and a switch 4 to an AC power source 5, the output 12 of a power converter is controlled via a switch 25 so as to become equal to the voltage reference 21 when the switch 4 is opened, and the effective and reactive components of the power are controlled and interlocked with the reactive power reference 22 and the effective power reference 31 by switching the switches 25, 36. The malfunction of a DC power source 1 is detected by a controller 42, the switch 36 is closed, the switch 53 is opened, thereby shortcircuiting the effective power control, and the phase of the converter 2 is controlled to become equal to the voltage reference 51. Accordingly, the operation as the reactive power regulator for stabilizing the voltage of the system can be continued at the malfunction time. |
