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Energies 2018, 11(2), 411; https://doi.org/10.3390/en11020411

A Control Approach and Supplementary Controllers for a Stand-Alone System with Predominance of Wind Generation

Electrical Engineering Department, Federal University of Technology, Pato Branco 85503-390, Paraná, Brazil
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Received: 23 December 2017 / Revised: 16 January 2018 / Accepted: 30 January 2018 / Published: 10 February 2018
(This article belongs to the Section Electrical Power and Energy System)
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Abstract

This paper proposes a control approach and supplementary controllers for the operation of a hybrid stand-alone system composed of a wind generation unit and a conventional generation unit based on synchronous generator (CGU). The proposed controllers allow the islanded or isolated operation of small power systems with predominance of wind generation. As an advantage and a paradigm shift, the DC-link voltage of the wind unit is controlled by means of a conventional synchronous generator connected to the AC grid of the system. Two supplementary controllers, added to a diesel generator (DIG) and to a DC dump load (DL), are proposed to control the DC-link voltage. The wind generation unit operates in V-f control mode and the DIG operates in PQ control mode, which allows the stand-alone system to operate either in wind-diesel (WD) mode or in wind-only (WO) mode. The strong influence of the wind turbine speed variations in the DC-link voltage is mitigated by a low-pass filter added to the speed control loop of the wind turbine. The proposed control approach does not require the use battery bank and ultra-capacitor to control the DC-link voltage in wind generation units based on fully rated converter. View Full-Text
Keywords: power system dynamics and control; wind generation; stand-alone hybrid systems; islanded systems; isolated systems; distributed generation power system dynamics and control; wind generation; stand-alone hybrid systems; islanded systems; isolated systems; distributed generation
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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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Lukasievicz, T.; Oliveira, R.; Torrico, C. A Control Approach and Supplementary Controllers for a Stand-Alone System with Predominance of Wind Generation. Energies 2018, 11, 411.

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