| 摘要 |
PROBLEM TO BE SOLVED: To provide a system inter connection inverter which can normally realize follow-up control for characteristic change of a DC power source. SOLUTION: An output power calculating means 8 calculates an output power at every prescribed time, and a target DC voltage setting means 12 calculates, setting a DC voltage which provides the maximum output power as the target DC voltage, the increase or decrease in the preceding value and current value of the DC voltage detected with the DC voltage detecting means 11 and increase and decrease in the preceding value and current value of the output power. When the current DC voltage is higher than the preceding value and the current output power is lower than the preceding value, a mans 1 updates the target DC voltage to a lower value, because such a target DC voltage is too high, and when the current DC voltage is lower than the preceding voltage and the current output power is higher than the preceding voltage, the means 1 updates the target DC power to a higher value, because such target value is too low and a DC voltage comparing means 13 controls the increase or decrease of the amplitude of the reference waveform, so that the DC voltage becomes the updated target DC voltage until the next prescribed time elapses. With the repetition of such a process, the target DC voltage is trial controlled. |
