Synchronous mode operation of DFIG based wind turbines for improvement of power system inertia

Authors

Amila Wickramasinghe, University of WollongongFollow
Sarath Perera, University of WollongongFollow
Ashish P. Agalgaonkar, University of WollongongFollow
Lasantha G. Meegahapola, RMIT UniversityFollow

RIS ID

106849

Publication Details

A. Wickramasinghe, S. Perera, A. P. Agalgaonkar & L. Meegahapola, "Synchronous mode operation of DFIG based wind turbines for improvement of power system inertia," Renewable Energy, vol. 95, pp. 152-161, 2016.

Abstract

Inertia emulation methods exist to compensate for the reduced inertial support provided by doubly fed induction generator (DFIG) based wind turbines. Instead of emulating inertia, this paper proposes to temporarily convert DFIGs to synchronous generators, enabling supply of real inertia to the system. In order to achieve this, the voltage supplied to the DFIG rotor needs to be made independent of the grid frequency. Feeding the rotor with a fixed dc voltage while it is rotating at synchronous speed enables the DFIG to operate in synchronism with the grid and couple the inertia of its rotating mass to the power system. The rotor side converter of a DFIG can be controlled to function as the dc voltage source, allowing convenient switching between the two operation modes according to system requirements.