METHOD AND APPARATUS FOR CONTROLLING POWER SUPPLY SYSTEM, AND SYSTEM

A photovoltaic system includes a controller and plurality of photovoltaic strings that are independently controlled. The controller enables some photovoltaic strings to be in a maximum power point tracking state, and the remaining photovoltaic strings to be in a power output limited state. The system implements maximum power point tracking detection so that the maximum power point power and the maximum power point voltage are updated in real time. Further, the working status of the power supply system can be fed back in real time, so that the photovoltaic system can predict the capacity of an energy storage apparatus or regulate charging and discharging of the energy storage apparatus. After a curtailment state ends, the photovoltaic system is relatively quickly restored to the normal working state, so that a loss of generated power is reduced.