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Sustainability 2017, 9(9), 1536; doi:10.3390/su9091536

An Approach to Improve the Penetration of Sustainable Energy Using Optimal Transformer Tap Control

School of Electrical Engineering, Korea University, Anam Campus, 145 Anam-ro, Seongbuk-gu, Seoul 02841, Korea
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Received: 23 June 2017 / Revised: 25 August 2017 / Accepted: 26 August 2017 / Published: 30 August 2017
(This article belongs to the Special Issue Energy Harvesting Communication and Computing for Sustainable IT)
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Abstract

A method to secure the generator reactive power reserve by adjusting the transformer tap to improve the power system penetration of renewable energy has been proposed in this study. The tap is adjusted based on the voltage and reactive power sensitivity in the power system network. That is, the transformer tap sensitivity is calculated and analyzed to adjust the tap variation to gain sufficient or the least necessary amount of reactive power reserve. This method can be effective for generators without any margins in the reserves. The optimization problem based on the calculated sensitivities and effectiveness are presented. The optimum solution derived from such a problem provides the minimum control amount necessary to maintain the system voltage and dynamic reactive power reserve at their pre-specified levels to improve the power system acceptability of renewable energy. To demonstrate the effectiveness of the method proposed, a simulation has been performed for an IEEE-25 bus system. The results from simulations prove that the voltage has been well maintained while securing a dynamic reactive power reserve through optimal control based on the sensitivity analysis. View Full-Text
Keywords: reactive power reserve; sensitivity analysis; on-load tap-changers; sustainable energy penetration reactive power reserve; sensitivity analysis; on-load tap-changers; sustainable energy penetration
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Bae, M.; Lee, H.; Lee, B. An Approach to Improve the Penetration of Sustainable Energy Using Optimal Transformer Tap Control. Sustainability 2017, 9, 1536.

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