Apparatus for controlling solar light voltage

An apparatus for controlling a solar light voltage, which directly converts sunlight into electrical energy, comprising:

• a DC filter configured to receive a DC voltage from a DC solar module and reduce a noise of the DC voltage;
• an inverter configured to convert the DC voltage with the reduced noise into an AC voltage;
• and
• an AC filter configured to reduce a noise of the AC voltage and output the AC voltage with the reduced noise to a power system through an output stage,
• wherein the AC filter includes:
• a determination unit which determines whether or not the inverter or the power system is normal based on a voltage value of the inverter or a voltage value of the power system,
• wherein the output stage is configured to include:
• a capacitor configured to connect in parallel with the power system between the inverter and the power system;
• relays configured to interrupt a connection between the inverter and the capacitor;
• and
• one or more loads configured to connect in parallel with the capacitor, and
• wherein the AC filter is further configured to discharge a voltage of the capacitor by adjusting resistance of the one or more loads when the inverter and the capacitor are disconnected by the relays, thereby discharging the voltage.