The present invention relates to a photovoltaic-based autonomous independent microgrid system and a method of operating the photovoltaic system using a DC-DC converter that automatically adjusts the amount of generation of photovoltaic power generation according to a charging voltage of an energy storage device. An autonomous standalone microgrid system and a method of operating the same. The solar-based autonomous stand-alone microgrid system of the present invention, the solar power generator 10, a DC-DC converter having a buck-boost function and level-converts the DC power supplied from the solar power generation (10) ( 20), at least one diesel generator 30 that is manually operated, a power converter 40 for converting the AC power supplied by the diesel generator 30 into direct current power, a battery having a DC-DC converter 20 And an energy storage device 50 for storing the DC power supplied from the power converter 40, an inverter 60 for converting the DC power of the energy storage device 50 into AC power and providing the power to the power load 80. And a power meter 70 for sensing and measuring the amount of power provided to the power load 80, the power converter 40 is turned off and the photovoltaic power generation 10 is turned on and the energy storage device 50 is turned on. In the state where the DC-DC converter 20 and the inverter 60 are turned on In this case, the battery of the energy storage device 50 is charged. When the voltage of the battery is greater than or equal to a predetermined maximum voltage, the DC-DC converter 20 automatically stops charging. It is characterized in that the power supply to the power load 80 is automatically stopped.
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