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- Vieira Turnell, Alice, et al.
(författare)
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Risk and economic analysis of utilizing dynamic thermal rated transformer for wind farm connection
- 2018
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Ingår i: 2018 International Conference on Probabilistic Methods Applied to Power Systems, PMAPS 2018 - Proceedings. - : IEEE conference proceedings.
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Konferensbidrag (refereegranskat)abstract
- Dynamic transformer rating (DTR) can be used to load power transformers above nameplate rating, while respecting contingency loading limits and ensuring an acceptable risk level. Purchase of power transformers is a major contributor for high costs of building new substations. Application of DTR allows to postpone the investment in new power transformers in old substations, thus DTR has a potential to become an economically beneficial technology. A quantitative risk and economic evaluation of DTR application is performed for a wind farm connected transformer and thus for a highly variable load scenario. The risks analyzed in this project are increased loss of insulation life and the risk of dielectric failure, based on the Arrhenius-Weibull model. A comparative net present value calculation has been performed to investigate the profitability of replacing a 19.4 MVA transformer with a 16 MVA dynamically rated transformer. The feasibility of DTR application is analyzed and a methodology is developed to support both transformer manufacturer and potential customers, such as distribution system operators, in the decision-making process of purchasing of dynamically rated transformer for wind energy applications.
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