| 摘要 |
PROBLEM TO BE SOLVED: To compensate for a sudden change in output voltage because of, for example, a change in instantaneous value of power supply voltage without any response delay in a series-parallel power supply circuit having a parallel inverter on its input side and a serial inverter on its output side respectively. SOLUTION: When the inverter 3 controls input current 11 and the inverter 4 controls output voltage V2 respectively with the inverter 3 connected in parallel with the AC power supply 1 and the inverter 4 connected in series with its output side, the sudden change in the output voltage because of, for example, a change in the instantaneous voltage value of the power supply 1 cannot be sometimes accommodated. To prevent such a disadvantage, a difference between a command value of compensation voltage Vc for the inverter 4 and a command value of the output voltage V1 of the inverter 3 is obtained by an adder 16, and the inverter 4 is controlled by its output. |
