Introduction-frequency characteristics of power system 9)the load variation can be categorized into three components: Stochastic components:period less than 10s Fluctuating components:period 10s~3min Sustained components:period >3min;load prediction can forecast this component. 10)governor acts to regulate the output of the prime mover for the frequency deviation caused by first component:primary frequency control 电力拿镜广城洲量写控制四川省重点实验蜜 家电网电力系统广域测量与控制四川省重点实验室  9）the load variation can be categorized into three components:  Stochastic components: period less than 10s  Fluctuating components: period 10s~3min  Sustained components: period >3min; load prediction can forecast this component.  10）governor acts to regulate the output of the prime mover for the frequency deviation caused by first component: primary frequency control Introduction-frequency characteristics of power system