DEVICE AND METHOD FOR SMOOTHING ELECTRIC POWER

Provided is a power smoothing device comprising: a renewable energy data generating unit configured to receive and sum output power values of renewable energy sources; a data preprocessing unit configured to divide power value data output from the renewable energy data generating unit into a short-term fluctuation component, a medium-term fluctuation component, and a long-term fluctuation component; a power command calculation unit configured to calculate a first power command value to be output to a short-term response energy supply and flexibility resource based on the short-term fluctuation component, a second power command value to be output to a medium-term response energy supply and flexibility resource based on the medium-term fluctuation component, and a third power command value to be output to a long-term response energy supply and flexibility resource based on the long-term fluctuation component; and a power command output unit configured to output the first to third power command values calculated by the power command calculation unit to the corresponding energy supply and flexibility resource.