| 摘要 |
PURPOSE:To correct the variation in the output AC voltage of an inverter by detecting the voltage variation amount of an AC power source, and correcting the voltage command signal for deciding the output AC voltage of a voltage type inverter by the voltage variation amount. CONSTITUTION:The actual AC voltage value of an AC power source 1 is detected by a transformer 15 for an instrument connected to an AC power source 1 and a power source voltage detector 16. A reference voltage generator 17 outputs an AC voltage reference value to become a reference. A subtractor 18 subtracts the AC reference value by the actual AC voltage value to obtain the voltage variation amount of the power source 1. Since an adder 19 adds a voltage command value outputted from a function generator 14 and the voltage variation amount, the adder 19 outputs a voltage command value corrected by the variation of the power source voltage. |
