| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a photovoltaic power generation system which raises the precision of follow-up control to a maximum power point to suppress oscillations of a solar battery voltage when a low solar radiation condition is detected. <P>SOLUTION: A control circuit 10 calculates a target solar battery voltage on the basis of the solar battery voltage, an inverter output voltage, and an inverter output current and shifts the power of a solar battery 1 to a maximum power by controlling an inverter circuit 3 so that the solar battery voltage agrees with the target solar battery voltage, and reads in the solar battery voltage when the maximum power of the solar battery is detected on the basis of an output power of a product between the output voltage and the output current, and calculates an average voltage from a plurality of solar battery voltages in the case that the solar battery voltage in this state is read a plurality of times, and the calculated average voltage is defined as the target solar battery voltage to control the inverter circuit 3 when the low solar radiation condition under which the power of the solar battery 1 is reduced is detected, so that the solar battery voltage agrees with this target solar battery voltage. <P>COPYRIGHT: (C)2008,JPO&INPIT</p> |
