석유시추선의 전력계통 설계 및 해석

Abstract

As electricity has been used in ship's propulsion, it is necessary to increase the system voltage and current for the electrical distribution system. So it is required to improve the system safety and efficiency, the power stability, the efficiency of the generation through various analysis of ship's electric power system. In this paper, the electrical service reliability of the power distribution system of Semi Submersible Drilling Rigs(SSDRs) has been analysed and discussed using Electrical Transient Analysis Program(ETAP).

In the case of Semi Submersible Drill Rigs that are being used in most of the deepwater drilling operations, it can move by thrusters with Dynamic Positioning System(DPS), and has equipped a drilling packages like pumps, pipes and drills.

The electrical distribution system of Drilling rigs is quite similar to typical redundancy system of electric propulsion ships made for transportation. However it is required the electrical distribution system of 2 to 4 split bus or more because of the severe marine environment, the hazards of fire and explosion, 24-hours operation, the standards and regulations related to oil and gas drilling. There are some more difficulties in design and engineering of the off-shore plants electric power system because it is required more severe and strict conditions.

In this paper, to verify the stability of designed power system, the power system of SSDRs is modeled at first and load flow is analysed on each operational mode and also analysed on transient characteristics due to start/stop action between generators and loads. On the basis of the analysis the voltage variation in the distribution feeder is discussed.

As a result, the load flow analysis shows the resonable result with appropriate load distribution and the capacity of generators and transformers are enough to feed the maximum load. The capacity of generators and transformers have an acceptable margin for future load and emergency load.