| 摘要 |
PURPOSE:To stabilize a system and suppress higher harmonics without deteriorating the independent operation detecting function of inverters. CONSTITUTION:An inverter 2 which converts a DC voltage into an AC voltage and is operated in interconnection with an AC system 8, a phase adjusting means 17 which changes the current phase of the inverter 2 in the phase advancing direction in accordance with the conversion of frequencies when the frequency of the AC voltage changes in the increasing direction near a rated frequency, and voltage compensating means 20, 21, and 28 which control the current phase of the inverter in the direction in which the variation of the AC voltage is suppressed by using the voltage variation of the AC voltage are provided. In addition, a dead zone is also provided so that voltage variation suppressing operations can be performed when the AC voltage varies beyond a prescribed range of set voltages. |
