Control device for controlling photovoltaic cell to carry out stepped power generation along with illumination change of environment and solar photovoltaic power generation system

The utility model discloses a control device for controlling a photovoltaic cell to carry out stepped power generation along with the illumination change of the environment, which is used for a photovoltaic power generation system. The photovoltaic power generation system comprises a solar cell panel and a storage battery pack comprising a plurality of sub storage battery packs. The control device is formed in a mode that the sub storage battery packs are connected in series; an anode of the last stage of sub storage battery pack is connected with an anode of the solar cell panel; and a cathode of each stage of sub storage battery pack is connected with a cathode of the solar cell panel through a control branch circuit. The control device is used for switching on or switching off the corresponding control branch circuits according to detected current total electric power storage voltages of the storage battery packs and a detected current voltage of the solar cell panel, so that the corresponding sub storage battery packs enter or exit a charging state. The utility model also provides a solar photovoltaic power generation system. Due to the adoption of the embodiment of the utility model, the changed power generation characteristic of the solar photovoltaic power generation system under the sunshine conditions in different time periods all day can be sufficiently utilized, the photovoltaic power generation efficiency is improved, and the energy waste is avoided.