Abstract: With the planning and operation of CNOOC Qinhuangdao 32-6 and Caofeidian 11-1 shore power projects, the scale of offshore platforms has been simplified, the dependence on imported generator units has been reduced, and the construction cycle and commissioning cycle of offshore oil field projects have been effectively shortened, so as to reduce the "threshold" of the development economy of marginal oil fields and speed up the construction of oil and gas production capacity. The problems of power grid safety and stability of offshore platforms and shore power have also changed; After the CNOOC Qinhuangdao 32-6 and Caofeidian 11-1 shore power projects are put into operation, this paper analyzes the safety and stability problems existing in 220 kV Haishun switching station, 220 kV haidiao switching station and 220 kV Haifeng substation offshore power station, formulates reasonable control measures, and puts forward the control scheme of power grid stability control system and the configuration scheme of stability control device.