Introduction-frequency characteristics of power system 1)the rotation speed of an interconnected generator has a relationship between the system frequency: pn f= 60 Where:P-no.of pole of the generator n-revolution per minite (r/min fsystem frequency (Hz) It is clear that the frequency control is actually the regulation of the rotation speed of generator 电力拿镜广城洲量写控制四川省童点实验蜜 家电网电力系统广域测量与控制四川省重点实验室 Introduction-frequency characteristics of power system  1）the rotation speed of an interconnected generator has a relationship between the system frequency:  Where: P——no. of pole of the generator  n ——revolution per minite（r/min）  f——system frequency（Hz）  It is clear that the frequency control is actually the regulation of the rotation speed of generator 60 pn f 