Development and analysis of hybrid renewable energy system for offshore oil and gas rigs

Tee, Jing Zhong (2022) Development and analysis of hybrid renewable energy system for offshore oil and gas rigs. PhD thesis, University of Glasgow.

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Over the years, the decline of capital expenditure (CAPEX) on offshore wind turbine generation (WTG) and battery energy storage systems (BESS) has led to great interest in the electrification of offshore oil and gas (O&G) platforms with renewable sources. This will reduce the carbon footprint as the on-board gas turbine generation (GTG) can be removed. The state of the art has presented that O&G platforms integrated with BESS and an energy management system (EMS) is able to enhance output power quality to load, in the face of sequential events of dynamic loading and fluctuations in wind [11]. However, the proposed technique required a low-pass filter, which removed high frequencies in the voltage and frequency analysis, especially in the transient period. As such, it is expected that the efficiency is reduced due to power losses in the system.

The main focus of this thesis is to develop an optimised EMS for transient stability enhancement, in the presence of simultaneous changes in dynamic loads and stochasticity in wind speed, for offshore O&G platforms integrated with WTG. There are five main contributions in this thesis. First, a power stability study has demonstrated a reduction in transient deviation of output power for systems without and with BESS respectively [51]. Second, a transient stability analysis is presented for variations in BESS sizing using a commercial software, ETAP. The simulation has also shown that the proposed system, which has incorporated 2 MW of BESS, improved transient stability and met the IEC standards on maximum voltage and frequency deviations [61]. Third, an optimisation of transient stability was shown for an increased capacity in BESS from 2 MW to a total of 4 MW BESS [62]. The techno-economic feasibility of the proposed system is carried out, which shows that the BESS has the lowest operational expendture (OPEX) as compared with GTG or WTG [61], [62]. Last but not the least, an optimised transient stability solution is demonstrated with dynamic loading and stochasticity in wind speed. An EMS embedded in the BESS is developed and the simulation results for transient stability are compared against the current state of art. The superiority of the proposed EMS was demonstrated with a smaller voltage and frequency deviation, which improved the output power quality with variations in load variation and wind intermittency. In addition, it is developed with considerations to lower the overall cost of the system and provide decarbonisation for long-term continuous operation.

Item Type: Thesis (PhD)
Qualification Level: Doctoral
Subjects: T Technology > T Technology (General)
Colleges/Schools: College of Science and Engineering > School of Engineering
Supervisor's Name: Lim, Dr. Li Hong Idris and Yang, Dr. Jin
Date of Award: 2022
Depositing User: Theses Team
Unique ID: glathesis:2022-83088
Copyright: Copyright of this thesis is held by the author.
Date Deposited: 19 Aug 2022 10:30
Last Modified: 22 Aug 2022 09:29
Thesis DOI: 10.5525/gla.thesis.83088
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