The invention discloses a
system and a method for supplying power cooperatively by a mains supply, a photovoltaic
cell and an
energy storage battery. The method comprises the steps of firstly, acquiring a maximum output power and a load required power of the solar photovoltaic
cell; if the maximum output power is greater than the load required power, starting the solar photovoltaic battery to supply power and charge the battery; and if the maximum output power is less than the load required power, starting the battery to supply power or starting the mains supply to supply power. According to the
system and the method, the photovoltaic
cell, the mains supply and the battery used as energy sources pass through self
converters to have a unified output standard, and supply power to a
bus, and each load receives energy from the
bus through a DC-DC (
direct current) converter and a DC-AC (
alternating current) converter. Based on the structure design of the
bus, various loads, including AC loads or DC loads, even loads with different voltages, in a power supply
system can be satisfied, so that the structure can concurrently take different power supply requirements of various loads into consideration, can facilitate the expansion of the system, and also can facilitate the application of the system in different situations, therefore, the system and the method disclosed by the invention are wide in application range.