On the basis of analysis on the 50% load rejection test for ultra supercritical 1 000 MW unit of Guangdong Yudean Jinghai Power Generation Co.

Ltd.

the related operation methods were proposed

and several control measures for such factors as main steam pressure

quantity of feed water and coal

water level of the condenser and deaerator

main steam temperature and combustion were also put forward.After the improvement

the main steam temperature was kept stable during the 50% load rejection test

and the sharp increase of turbine speed was effectively controlled.The unit can be stably operated with empty load.Besides

the dynamic property of the digital electro hydraulic control system(DEH) was examined during the test.