The key to the safe and reliable operation of the unit after high and low prssure bypass heat supply transformation is to design a reasonable control strategy. According to the system characteristics of the high and low bypass heating transformation and the safe operation requirements of the unit

this paper puts forward the basic control principle that the high pressure bypass steam flow and the low pressure bypass steam flow should be properly matched

and designs the control strategy of the high and low pressure bypass

the adjusting valve of the turbine and the by-pass spray water temperature reducing system. Moreover

the original logic is sorted out

and the compensation loop of the unit's coordinated control is added. Through the implementation of the actual project

the automatic input of each control loop is completed. The results show that

the unit operates stably

the parameters are stable

and the control quality meets the requirements.