Abstract: Aiming at the problems of high energy consumption, high noise, and environmental pollution existing in the independent diesel engine drive scheme adopted by traditional fracturing vessels, relying on the "Haiyang Shiyou 623" large-scale fracturing vessel, this study carried out research on the key technologies of integrated drive between the fracturing system and the ship$'$s electric propulsion system. In the research, an integrated drive architecture of the common power plant was adopted, the AC 6 600 V power distribution system was designed as a closed-ring system configuration, the common power plant was divided into 5 redundant groups, a dual fault isolation mechanism of main protection and backup protection was configured, and the Advanced Generator Protection (AGP) system and voting mechanism were integrated. The fracturing pump adopted a 24-pulse diode rectifier inverter (DFE) frequency drive scheme, three-winding transformers were used to isolate the fracturing system from the ship$'$s 400 V system, and active power filters were added to address the problem of excessive harmonics. The research achieved flexible operation of the power plant and optimization of fuel consumption, significantly reduced the impact range of the maximum single failure, effectively controlled the potential hazards of hidden failures, greatly improved the stability and reliability of the power plant. This integrated solution breaks through the technical bottlenecks of the traditional drive mode, significantly reduces energy consumption and pollutant emissions, promotes the development of offshore fracturing operations towards energy conservation, high efficiency and environmental protection.

Key words: variable frequency drive, DP-2 based closed ring, hidden failure, main protection, backup protection