Introduction  Offshore platforms generally use self-powered offshore solutions. The power supply has a single power source, poor scalability, weak impact resistance, and low reliability and reliability of power supply. At the same time, the space of the offshore platform is very limited, and the investment in building a self-powered power supply is relatively high.

  Method  Based on a comparative study of the advantages and disadvantages of shoreline AC power transmission and DC power transmission schemes, this paper proposes a hybrid HVDC transmission scheme for a technically feasible and economical offshore platform. On this basis, this paper establishes the mathematical model of the conventional direct current and offshore platform side flexible DC on the land network. Combining the typical control method of the traditional HVDC converter and the typical control method of the flexible DC converter, a hybrid HVDC control strategy is proposed.

  Result  An electromagnetic transient simulation model of a hybrid flexible HVDC transmission system is established on PSCAD/EMTDC, including simulation system models of near area AC grid, hybrid HVDC system and offshore platform system. Carry out modeling and simulation analysis and analysis.

  Conclusion  The research results are very important to solve the safety and reliable power supply of offshore platform.