Thermal power generating unit intelligent primary frequency modulation control method aiming at large frequency-difference of power grid

The invention relates to a thermal power generating unit intelligent primary frequency modulation control method aiming at large frequency-difference of power grid. The thermal power generating unit intelligent frequency modulation control method includes the steps: when the power grid frequency change exceeds a set large frequency-difference, according to the power grid frequency difference and the practical power output situation, determining the primary frequency modulation load requirement to prevent the frequency modulation output power of the thermal power generating unit exceeding the current maximum practical output power capability of the thermal power generating unit so as to guarantee stable and safe operation of the thermal power generating unit; and at the same time, according to the frequency modulation load requirement, directly changing the corresponding coal quantity, feedwater flow and air volume of the thermal power generating unit, quickly compensating the energy requirement of the thermal