Abstract: With the increasing number of marine engineering projects in our country,the requirements to the new technology for the complex operation of marine engineering projects are increasing.The 5 000 t hoisting and piping vessel (hereinafter referred to as the background engineering) is such a vessel with the demand for multi-function operations.The vessel uses a comprehensive electric energy system and meets the DP3 dynamic positioning requirements to ensure that the system was designed to meet all the complex operational requirements.Based on the analysis of comprehensive electric energy system framework which includes power load calculation,calculation of short-circuit current,voltage level determination,grounding mode confirmation,harmonic analysis,load flow calculation etc.of the background engineering in different working conditions,it can provide a design reference for similar hoisting and piping vessel.

Key words: hoisting and piping vessel, comprehensive electric energy system, DP3 dynamic positioning, power load