Small capacity of Hainan power grid causes several problems

like frequent primary frequency regulation of the units

long time and large amplitude of single direction movement during primary frequency regulation

and others.Furthermore

as the power grid has two operation modes(networking and isolated grid)

the primary frequency control is relatively complex.Therefore

on the basis of analyzing the operation characteristics of Hainan power grid

the primary frequency control strategy of a 350 MW unit was optimized

to solve the frequent small amplitude primary frequency regulation problem and improve control quality of the primary frequency control.In addition

corresponding optimization on coordinated control system was also conducted to enhance the safety and stability of the unit operation

on the premise of ensuring the primary frequency control.