Abstract
In the face of increasingly serious energy and environmental problems, the safety of offshore oil drilling and production platform, as a natural gas development platform, is of great significance. For offshore platforms, the offshore power system serves for oil and gas production, and the interruption or shutdown of oil and gas production caused by electric power is intrinsically unsafe; In addition, due to the weak interconnection between the offshore platform systems, with the characteristics of small unit, large load, wide application of frequency conversion equipment and poor environment, the security analysis of the offshore platform power system must take the power grid and gas network as a whole to analyze and take into account the low-voltage crossing capacity. For the coupling of power grid and gas network of offshore platform, multi-stage compression system and the “power to gas” system are proposed. For these voltage sag sensitive systems, the safe critical voltage and critical cut-off time are used to characterize the low-voltage crossing capability. The operation constraints considering the low-voltage crossing capability are also proposed, and the impact of voltage sag is taken into account in the safety analysis. The simulation results show the correctness of the safety analysis method considering the low voltage crossing capability, and the necessity of the safety analysis considering the gas network and the low crossing capability.
Highlights
In recent years, with the massive reduction of fossil energy on land and the development demand of modern smart grid and low-carbon society, energy and environmental problems have become increasingly prominent, while natural gas, with its clean and efficient characteristics, has gradually been concerned and applied [1], [2]
The ‘‘power to gas’’ system of offshore platform is obviously different from the traditional P2G. ‘‘Power to gas’’ system is a collection of gas production equipment, including frequency conversion equipment such as electric submersible pump and water pump, which belongs to voltage sag sensitive load
According to the inlet pressure of the compressor during normal operation before the safety analysis in Fig. 8, if there is no pressure boosting function of the compressor, the natural gas will not continue to flow under the premise of meeting the load demand, which has a greater impact on system security
Summary
With the massive reduction of fossil energy on land and the development demand of modern smart grid and low-carbon society, energy and environmental problems have become increasingly prominent, while natural gas, with its clean and efficient characteristics, has gradually been concerned and applied [1], [2]. Because the power system voltage of offshore platform fluctuates frequently, the equipment has poor anti voltage sag capacity, and the equipment starts up for a long time after shutdown, which is easy to cause oil and gas production interruption. Considering the characteristics of offshore platform, this paper proposes a method to analyze the safety of offshore platform based on gas and electricity as a whole, and it is necessary to consider the voltage crossing capability of coupling equipment. The gas-electric interconnection model for safety analysis of offshore platform is established, and the voltage sag characteristics of coupling nodes are considered to realize the safety analysis.
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