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Energies 2018, 11(2), 439; https://doi.org/10.3390/en11020439

Power Loss Minimization for Transformers Connected in Parallel with Taps Based on Power Chargeability Balance

1
Research Group in Efficient Energy Management (GIMEL), Universidad de Antioquia, Calle 67 No. 53-108, 050010 Medellín, Colombia
2
Departamento de Ingeniería Eléctrica, Electrónica, Automática y Física Aplicada, Escuela Técnica Superior de Ingeniería y Diseño Industrial, Universidad Politécnica de Madrid, Ronda de Valencia 3, 28012 Madrid, Spain
*
Author to whom correspondence should be addressed.
Received: 17 January 2018 / Revised: 7 February 2018 / Accepted: 9 February 2018 / Published: 15 February 2018
(This article belongs to the Section Electrical Power and Energy System)
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Abstract

In this paper, a model and solution approach for minimizing internal power losses in Transformers Connected in Parallel (TCP) with tap-changers is proposed. The model is based on power chargeability balance and seeks to keep the load voltage within an admissible range. For achieving this, tap positions are adjusted in such a way that all TCP are set in similar/same power chargeability. The main contribution of this paper is the inclusion of several construction features (rated voltage, rated power, voltage ratio, short-circuit impedance and tap steps) in the minimization of power losses in TCP that are not included in previous works. A Genetic Algorithm (GA) is used for solving the proposed model that is a system of nonlinear equations with discrete decision variables. The GA scans different sets for tap positions with the aim of balancing the power supplied by each transformer to the load. For this purpose, a fitness function is used for minimizing two conditions: The first condition consists on the mismatching between power chargeability for each transformer and a desired chargeability; and the second condition is the mismatching between the nominal load voltage and the load voltage obtained by changing the tap positions. The proposed method is generalized for any given number of TCP and was implemented for three TCP, demonstrating that the power losses are minimized and the load voltage remains within an admissible range. View Full-Text
Keywords: transformers connected in parallel (TCP); tap-changers; power chargeability; power loss minimization; genetic algorithms transformers connected in parallel (TCP); tap-changers; power chargeability; power loss minimization; genetic algorithms
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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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Jaramillo-Duque, Á.; Muñoz-Galeano, N.; Ortiz-Castrillón, J.R.; López-Lezama, J.M.; Albarracín-Sánchez, R. Power Loss Minimization for Transformers Connected in Parallel with Taps Based on Power Chargeability Balance. Energies 2018, 11, 439.

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