System and method for control of shortening AGC response time

The present invention relates to a system and a method for control of shortening AGC response time, belonging to the field of power station thermotechnical automatic control technologies. In a load change process, when a target command is subjected to direction change in advance, active power follows feature difference, AGC response time usually exceeds time limit with 60s specified in the 'two detailed rules'. The system comprises a command generation unit, an active power measurement unit, an override working condition operation unit, a load command switching unit, a rate switching unit, a rate control unit and a unit actual load command generation unit. According to a logic relation of the target command, the active power and the unit actual load command (LDC), it is determined whetherthe override working condition is true or not. When the override working condition is true, the LDC is switched to an active power value, and when the override working condition disappears, delay for1s is performed to recover