| 摘要 |
<P>PROBLEM TO BE SOLVED: To reduce a loss of tracking time of maximum power point voltage when returning to MPPT control after switching from the MPPT control to interconnected point voltage suppression control in a system-interconnected inverter device. <P>SOLUTION: A controller 4 comprises: a first voltage command value generation part 401 for controlling an inverter device 3 through MPPT control; a second voltage command value generation part 402 for controlling the inverter device 3 through interconnected point voltage suppression control; and a voltage command value switching part 403 for switching between the MPPT control and the interconnected point voltage suppression control. When the voltage command value switching part 403 switches from the MPPT control to the interconnected point voltage suppression control, the second voltage command value generation part 402 switches from control for increasing output voltage of a solar battery 2 to control for decreasing the output voltage, and searches for a maximum power point of the solar battery 2. When the output voltage of the solar battery 2 reaches voltage at the maximum power point, the second voltage command value generation part 402 ends the interconnected point voltage suppression control, and the first voltage command value generation part 401 starts the MPPT control. <P>COPYRIGHT: (C)2013,JPO&INPIT |
