DEMAND CONTROL METHOD FOR ELECTRIC POWER SYSTEM, AND ITS SYSTEM

PROBLEM TO BE SOLVED: To suitably find an optimal control period precisely corresponding to a situation on a demand side.SOLUTION: In a past actual result gathering step S11, a past actual result gathering section 11 reads in past actual result data and date condition data D12, and extracts actual result data corresponding to the date condition data D12 from the actual result data to generate analysis object data D13. In a time-series model fitting step S22, a time-series model fitting section 12 reads in the analysis object data, and finds an ARMA model coefficient D14 approximating the analysis object data D13. In a power spectrum calculation step S32, a power spectrum calculation section 13 calculates a power spectrum D15 of the ARMA model coefficient D14 and in a control period calculation step S42, a control period calculation section 14 calculates a control period D16 using a maximum frequency component of the power spectrum D15.