In order to meet the requirement of accuracy and instantaneity in frequency modulation capacity calculation for automatic generation control(AGC)after the marketization of ancillary services

the real-time calculation method of AGC frequency regulation capacity is proposed by analyzing the various factors which affect the demand of frequency modulation capacity. The load

new energy power fluctuation

tie line exchange plan

unit power generation schedule and related performance evaluation criteria are comprehensively considered in the real-time calculation method. A power grid in North China is given as an example. The calculation result indicates that the AGC frequency modulation capacity of the power grid is consistent with the actual operation condition of the power grid and the effectiveness of proposed method is verified by the result.