Browsing by Author "Ant-Wuorinen, Risto"

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Benchmarking of islanded power systems: Analysis and indications for best practice
(2014-12-15) Ant-Wuorinen, Risto
Insinööritieteiden korkeakoulu | Master's thesis
This Master’s thesis is an analysis of the performance of European islanded energy producers based on a survey and a literature review. The main focus of this thesis is on the performance differences between the islands. A secondary focus is on introducing energy technology research done in islanded circumstances and key areas where islanded power systems differ from mainland power systems. A tertiary focus is on different energy policies practiced by the islands and their regulators. A detailed benchmarking exercise of islanded energy systems was undertaken in collaboration with a group of islanded power system operators under the auspices of EURELECTRIC, the association for European Power Companies. The analysis identifies best practice for power system operation, management and planning for different categories of islands. The survey data was used to assess the energy systems across different islands. Key differences between the island groups were ascertained. Best practices and policy recommendations are identified, based on both the best performance in each island group as well as findings from the literature review. Island energy producers face very specific problems related to isolation of their energy system, but the unique situation of the islands as is also seen as providing the potential for experimentation and research. This paper presents a literature review of different studies in which island power systems are used as examples or test cases, covering current research regarding islands beyond the scope of the survey. The literature review encompasses an introduction to the topic of islanded power systems and outlines the possibilities of using islands as test beds for renewable energy research and for other energy related studies. A section on islanded energy policy introduces the ways in which European legislature and regulatory bodies should address energy policy development in an island context. Islands are shown to require special attention when it comes to regulation and policy goal setting. Constraints and characteristics of islanded power systems are presented.
Ilmastonmuutokset ja niiden yksinkertaistettu laskenta
(2011) Ant-Wuorinen, Risto
Insinööritieteiden korkeakoulu | Bachelor's thesis
Techno-Economic Analysis of Battery Energy Storage Systems in Wind Power Plants and Reserve Markets
(2024-08-19) Laine-Ylijoki, Juho
Sähkötekniikan korkeakoulu | Master's thesis
The increased share of renewable energy sources causes issues in the power system, which must be able to balance energy production and consumption at all times. These operational challenges can be addressed by utilizing battery energy storage systems. The recent fluctuations in electricity market prices have, however, made it more difficult for companies to evaluate the profitability of these systems, both in conjunction with existing wind power plants and as standalone systems. This thesis investigates the operation and annually generated revenues of a lithium-ion battery energy storage system in wind power balance error management and in Finnish electricity reserve markets by formulating two optimization models. First, a Mixed-Integer Linear Programming (MILP) model is formulated to analyze the utilization of a battery energy storage system in wind power balance error management. After that, the utilization of a standalone battery energy storage system in the Finnish reserve markets is researched by formulating a Mixed-Integer Nonlinear Programming (MINLP) model, which is further recast into an equivalent MILP model. Both models are simulated for one year using data from 2023. Finally, profitability analyses based on the simulated annual revenues are conducted using the two models to examine the long-term profitability outlook of the investments. Based on the research, the utilization of a battery energy storage system decreases the wind power balance error. However, the low revenues combined with high investment costs do not support the battery energy storage system investment solely for wind power balance error management, with a payback period of over 20 years. The research also shows that the operation of a standalone battery energy storage system in the Finnish reserve markets is profitable, with a net present value of 8.6 million euros and a payback period of under five years.