In an ultra supercritical 1 000 MW double-reheat unit

the control strategy of water-coal ratio is coal follows water. To adapt the dramatic increase in the unit's thermal inertia

the coal-water ratio control strategy was changed into the one that coal follows water mainly in the dynamic process and water follows coal mainly in the steady process. The two control strategies cross each other

which not only can adjust the intermediate point temperature quickly to ensure the safe and stability of the unit

but also can reduce the deviation of the main steam pressure to satisfy the requirements of AGC and the primary frequency control. The research provides a new idea for control strategy of coal-water ratio for the double-reheat units.