| 摘要 |
PURPOSE:To prevent tripping even if a regenerative operating state is brought about by the wind energy. CONSTITUTION:The inverter comprises a converter section 1 for producing DC voltage by smoothing the input voltage from an AC power supply 7 through a capacitor 2, an inverter section 3 for inverting the DC voltage into an AC voltage of predetermined frequency and driving a motor 4 for rotating an air- conditioning fan, an inverter control section 13 for determining a voltage reference and a frequency reference depending on a speed set value, and means 21-23 for increasing the speed set value gradually when the DC voltage exceeds a predetermined level. |
