Hybrid charging/discharging solar energy storage apparatus

A hybrid charging/discharging solar energy storage apparatus, comprising:

• a solar power generator configured to receive incident solar light and generate electricity;
• a power converter configured to receive at least power generated by the solar power generator as input power and convert the input power into output power by changing a voltage of the input power;
• an energy storage unit comprising a plurality of modules configured to store power;
• a load connection line connected to a load configured to consume power of at least one of the power converter and the energy storage unit;
• and
• a power controller configured to control charging and discharging of the energy storage unit according to preset charging/discharging policies,
• wherein some of the plurality of modules that are connected in series constitute a plurality of stacks,
• the plurality of stacks are divided into a capacitor stack group of capacitor stacks consisting of capacitor modules and a battery stack group of battery stacks consisting of battery modules,
• a charging policy of the charging/discharging policies includes
• a stack charging mode in which at least one stack of the plurality of stacks is charged with the output power,
• a module charging mode in which at least one module belonging to the plurality of stacks is charged with the output power, and
• an inter-stack charging mode in which at least one stack of the battery stack group is charged with power of at least one stack of the capacitor stack group,
• and the power controller controls charging in at least one of the stack charging mode, the module charging mode, and the inter-stack charging mode, according to the charging policy.