This application relates to a method for controlling a busbar voltage of a photovoltaic system. The photovoltaic system includes a DC/DC converter and a DC/AC converter. The DC/DC converter, the DC/AC converter, and an energy storage battery are connected via a busbar. The DC/DC converter is connected to a photovoltaic direct current source and performs maximum power point tracking on an input power from the photovoltaic direct current source. A load connected to the DC/AC converter has a load power. The energy storage battery has a maximum charging power and a maximum discharging power. The method includes: controlling the busbar voltage to be in a plurality of different discontinuous voltage intervals based on different results of comparison between a maximum photovoltaic power and the load power, the maximum charging power, and the maximum discharging power. The plurality of different discontinuous voltage intervals correspond to different operating states of the inverter.