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

Tiago Lukasievicz, Ricardo Oliveira and César Torrico
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Tiago Lukasievicz: Electrical Engineering Department, Federal University of Technology, Pato Branco 85503-390, Paraná, Brazil
Ricardo Oliveira: Electrical Engineering Department, Federal University of Technology, Pato Branco 85503-390, Paraná, Brazil
César Torrico: Electrical Engineering Department, Federal University of Technology, Pato Branco 85503-390, Paraná, Brazil

Energies, 2018, vol. 11, issue 2, 1-17

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.

Keywords: power system dynamics and control; wind generation; stand-alone hybrid systems; islanded systems; isolated systems; distributed generation (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2018
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (8)

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