Based on the analysis of heat storage mechanism

a feed-forward control strategy which can compensate the boiler heat storage quickly and accurately was presented

and the key control strategy for coal energy correct was proposed

too.These control strategies were adopted on a 300 MW and a 600 MW unit.For the former unit

during its frequent load ascending and descending process with a rate of 2%/min

the control system can keep the main steam pressure deviation within range of-0.4 MPa to 0.4 MPa.For the 600 MW unit

the control system can keep the main steam pressure deviation within this range when the fuel properties deviated far from that of the design coal.The results showed that

these control strategies can response the automatic generation control(AGC) demands quickly

and can compensate the boiler heat storage accurately and timely at the same time

improving the stability of the unit operation parameters.