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Development of a smart transformer to control the power exchange of a microgrid

Wim Willems (UGent), Tine Vandoorn (UGent), Jeroen De Kooning (UGent) and Lieven Vandevelde (UGent)
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Abstract
A smart transformer enables to control the power exchange between a microgrid and the utility network by controlling the voltage at the microgrid side within certain limits. The distributed generation units in the microgrid are equipped with a voltage-based droop control strategy. This controller reacts on the voltage change, making the smart transformer an element that controls power exchange without the need for communication to other elements in the microgrid. To build a smart transformer, several concepts are possible. In a smart transformer with continuous turns ratio, hereafter referred to as continuous smart transformer, the transformer's microgrid-side voltage can be controlled without voltage steps and the accuracy of the voltage control can be very high. The voltage control of a smart transformer with discrete turns ratio, hereafter referred to as discrete smart transformer, is less accurate, as the output voltage is regulated between several discrete values. In this paper, the development of a continuous and discrete smart transformer will be elaborated. Their validity will be proven by implementing these smart transformers in an experimental test setup. Also, some concepts to improve the control accuracy will be proposed.
Keywords
microgrid, distributed generation units, smart transformer, PART I, ELECTRONIC TAP CHANGER, droop control, on-load tap changing transformer

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Please use this url to cite or link to this publication:

Chicago
Willems, Wim, Tine Vandoorn, Jeroen De Kooning, and Lieven Vandevelde. 2013. “Development of a Smart Transformer to Control the Power Exchange of a Microgrid.” In IEEE PES Innovative Smart Grid Technologies Conference Europe, 1–5. IEEE.
APA
Willems, Wim, Vandoorn, T., De Kooning, J., & Vandevelde, L. (2013). Development of a smart transformer to control the power exchange of a microgrid. IEEE PES Innovative Smart Grid Technologies Conference Europe (pp. 1–5). Presented at the 4th European Innovative Smart Grid Technologies Conference (ISGT - 2013), IEEE.
Vancouver
1.
Willems W, Vandoorn T, De Kooning J, Vandevelde L. Development of a smart transformer to control the power exchange of a microgrid. IEEE PES Innovative Smart Grid Technologies Conference Europe. IEEE; 2013. p. 1–5.
MLA
Willems, Wim, Tine Vandoorn, Jeroen De Kooning, et al. “Development of a Smart Transformer to Control the Power Exchange of a Microgrid.” IEEE PES Innovative Smart Grid Technologies Conference Europe. IEEE, 2013. 1–5. Print.
@inproceedings{4159575,
  abstract     = {A smart transformer enables to control the power exchange between a microgrid and the utility network by controlling the voltage at the microgrid side within certain limits. The distributed generation units in the microgrid are equipped with a voltage-based droop control strategy. This controller reacts on the voltage change, making the smart transformer an element that controls power exchange without the need for communication to other elements in the microgrid. To build a smart transformer, several concepts are possible. In a smart transformer with continuous turns ratio, hereafter referred to as continuous smart transformer, the transformer's microgrid-side voltage can be controlled without voltage steps and the accuracy of the voltage control can be very high. The voltage control of a smart transformer with discrete turns ratio, hereafter referred to as discrete smart transformer, is less accurate, as the output voltage is regulated between several discrete values. In this paper, the development of a continuous and discrete smart transformer will be elaborated. Their validity will be proven by implementing these smart transformers in an experimental test setup. Also, some concepts to improve the control accuracy will be proposed.},
  author       = {Willems, Wim and Vandoorn, Tine and De Kooning, Jeroen and Vandevelde, Lieven},
  booktitle    = {IEEE PES Innovative Smart Grid Technologies Conference Europe},
  isbn         = {9781479929849},
  issn         = {2165-4816},
  keyword      = {microgrid,distributed generation units,smart transformer,PART I,ELECTRONIC TAP CHANGER,droop control,on-load tap changing transformer},
  language     = {eng},
  location     = {Copenhagen, Denmark},
  pages        = {1--5},
  publisher    = {IEEE},
  title        = {Development of a smart transformer to control the power exchange of a microgrid},
  year         = {2013},
}

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