Application Research of DC Self-sustaining Power Supply Mode in the Development of Offshore Marginal Gas Fields
For the marginal oil and gas fields with few wells and long distance,the solution of power supply scheme is one of the main restrictions for economically development.Taking the development of a marginal offshore gas field as an example,in view of the indispensable power supply of the platform for safety,control and communication system,and the small total power consumption load,most of which are DC loads requiring high reliability,a new power supply mode using DC generator unit self-sustaining power supply scheme with a backup battery and a portable micro diesel generator as a backup power supply is proposed.Process equipment and instrument valves driven by natural gas are used,outdoor electrical equipment is selected,no electrical room is set,and LED lighting is selected to con-trol the power load.From the perspectives of applicable conditions,reliability,fuel form,power range,degree of automation,and explosion-proof design,a comparison of DC power supply schemes for Closed Cycle Vaple Turbogenerator(CCVT)and Thermoelectric Generator(TEG)is car-ried out,and application suggestions for the new power supply mode are proposed.Compared with traditional submarine cable power supply,DC self-sustaining power supply scheme saves step-up and stepdown steps,is more secure and reliable,and reduces power loss of the system.The investment and installation cost of equipment and facilities are lower than that of traditional power supply mode.
marginal oil and gas fieldspower supply schemeDC self-sustaining power supplypower supply mode
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