| 摘要 |
PURPOSE:To eliminate the necessity of large reactive power by leading the control leading angle necessary for the amount of eliminating the commutation failure, thereby eliminating the unnecessary deterioration of the power factor of the power inverter. CONSTITUTION:The power of a power rectifer side AC power source 1 is supplied through a power reactor converter transformer 2 to a power rectifier 3, is converted to DC via the rectifier 3, supplied through a DC reactor 4 to a power inverter 7, the DC is converted to AC via the power inverter 7, and is supplied through power inverter converter 6 to a power inverter side AC power source 5. The power rectifier 3 is controlled under constant current by a control circuit 23, and the power inverter 7 is controlled under constant voltage by a constant-voltage control circuit 17. The set value of the allowable angle reference setter 20 is gradually varied as required by signals UV and CFD, thereby gradually advancing the control leading angle and preventing the deterioration of the power factor of the power inverter 7. |
