Introduction-load and frequency 20 variation Actual load profile 10 15 20 time of the day (hours) 50.5 50 49.5 Measured frequency variation curve 48.5 48 8日”月月器号用8888天昌88除日日日88过8且8温88g 院广城测量与控制四川省重点实验蜜 家电电力系统广域测量与控制四川省重点实验室 Introduction-load and frequency variation Actual load profile Measured frequency variation curve