Solar power generation system and control device

A solar power generation system comprising:

• a plurality of solar cell panels;
• a plurality of power converters provided so as to correspond to the plurality of solar cell panels respectively, and configured to convert DC power supplied from the plurality of solar cell panels to AC power corresponding to a power system and supply the AC power after conversion to the power system;
• and
• a control device configured to control a power conversion operation of the plurality of power converters,
• the control device including
• a total output calculation unit configured to calculate an active power total value indicating a magnitude of an active power currently outputtable from all of the plurality of power converters, by receiving an input of active power values indicating magnitudes of currently outputtable active powers of the plurality of respective power converters and by adding up the active power values of the plurality of respective power converters,
• a difference calculation unit configured to receive an input of the active power total value and receive an input of a total upper limit command value indicating an upper limit of an active power output from all of the plurality of power converters, and calculate a first difference between the total upper limit command value and the active power total value, and
• an upper limit command value calculation unit configured to receive an input of the first difference and receive an input of the active power values of the plurality of respective power converters, and calculate, based on the active power values of the plurality of respective power converters and the first difference, an individual upper limit command value indicating an upper limit of an active power individually output from each of the plurality of power converters,
• the upper limit command value calculation unit being configured to calculate a second difference by dividing the first difference by a number of power converters among the plurality of power converters, each power converter of the power converters having a difference less than or equal to a first reference value, the difference being obtained by subtracting a current active power value from a current individual upper limit command value, and add the calculated second difference to the current individual upper limit command value of the power converter having a difference less than or equal to the first reference value, the difference being obtained by subtracting the current active power value from the current individual upper limit command value, thereby calculating a new individual upper limit command value of the power converter having the difference less than or equal to the first reference value.