Currently

domestic research on reheat steam temperature control for secondary reheat ultra-supercritical units is limited to the simulation study.Based on the foreign secondary reheat ultra-supercritical units reheat steam temperature control

combined with sophisticated supercritical unit reheat steam temperature control strategy and flue gas recirculation control features of reheat steam temperature for units burning lignite

the reheat steam temperature control strategy for double reheat ultra-supercritical units is established.Thus

taking the secondary reheat ultra-supercritical 660 MW unit in Huaneng Anyuan Power Plant as an object

the reheat steam temperature control strategy and the difficulties in control were investigated and discussed.The results show that

for reheat steam temperature control in secondary reheat ultrasupercritical units

putting the smoke baffle and flue gas recirculation system control after the main steam pressure and middle point temperature were into automatic control

can improve the control quality of reheat steam temperature for the control system under various disturbances.Moreover

the units' operation requirements can be satisfied.Although this control strategy regards the reheat steam temperature control in 660 MW ultra-supercritical double reheat unit in Huaneng Anyuan Power Plant as the object

it can provide a reference for reheat steam temperature control strategy design for double reheat supercritical units with different reheat systems.