| 摘要 |
PURPOSE:To balance sharing of load without modifying the regulation characteristics by detecting the difference between input and output voltages of a releasing thyristor switch and applying a detection signal, as a voltage control compensation signal, if other inverters are not provided with a releasing thyristor. CONSTITUTION:A comparator 3 detects the difference between input and output voltages V1, V2 of a thyristor 2 and a coefficient unit 14 regulates the correction amount. A switch 15 receiving the output of the coefficient unit 14, as a correction input to a voltage control amplifier 11, is ON/OFF controlled at a mode switching section 12. The ON/OFF control is carried out for a parallel operation target, i.e., an inverter N provided with no thyristor switch, such that the switch 15 is turned ON only when the thyristor switch 2 is turned ON and only the voltage drop across the thyristor switch 15 is applied as a correction amount on a voltage control system. In such a manner, sharing of load is balanced. |
