Publikationen - Netze für Erneuerbare Energien
Majid Nayeripour, Mohammadmehdi Mansouri, Eberhard Waffenschmidt,
"A New Synchronization Method of Double Fed Induction Generator Wind
Turbines to the Grid",
Journal of Energy Research and Reviews, Vol. 1, Issue. 3, Aug. 2018
Meeting grid code requirement creates an obligation to smart WTs disconnection
following some electrical or mechanical events. Increasing the penetration
level of wind turbines (WTs) in different voltage levels of the network
have a major effect on this condition. In this regard, soft and rapid
synchronization control of doubly fed induction generator (DFIG) to
reduce the dynamic and transient effects of DFIG on a smart grid is
This paper gives a review on WTs power generation and a basic requirement
to operate in a stable manner in connection to the network at first.
After that, different startup and synchronization methods will be described.
Then, a new synchronization method for grid connection of DFIG driven
by WT is proposed.
In this method, the rotor side converter is synchronized with the induced
voltage at the rotor winding of DFIG while the stator windings have
been connected to the grid and the rotor accelerates normally with the
wind torque. This startup process is soft and the synchronization is
carried out between two low voltages with very low frequency and may
overcome some difficulties and limitations of previous methods since
it uses the rotor side converter as power electronics switches instead
of the mechanical circuit breaker at stator side and causes the synchronization
to be more accurate and controllable.
The proposed method is evaluated with EMTDC/PSCAD simulation to show
the performance of soft starting synchronization with lower electrical
transients in comparison with traditional methods.
> Available online (20.8.2018): http://www.sciencedomain.org/issue/3851
> Paper: PDF-Document
The synchronous controller