Doubly-fed wind power generation efficiency

Is double fed induction generator suitable for grid-connected wind energy conversion system?

This paper presents the control strategies and performance analysis of doubly fed induction generator (DFIG) for grid-connected wind energy conversion system (WECS). The wind power produces environmentally sustainable electricity and helps to meet national energy demand as the amounts of non-renewable resources are declining.

Can a doubly fed induction generator be built economically?

The doubly fed induction generator system presented in this article offers many advantages to reduce cost and has the potential to be built economically at power levels above 1.5 MW, e.g., for off-shore applications. A dynamic model of the DFIG was derived to develop a vector controller to decouple dynamically active and reac-tive power control.

What is a DFIG wind turbine?

The construction of a DFIG is similar to a wound rotor induc-tion machine (IM) and comprises a three-phase stator winding and a three-phase rotor winding. The latter is fed via slip rings. The voltage and torque equations of the DFIG in a stationary ref-erence frame are: Doubly fed induction generator wind turbine system. speed ratio n/n0 (right).

Will the power rating of wind turbines increase?

IT IS ANTICIPATED THAT THE POWER RATING OF WIND TURBINES WILL INCREASE. power flow in the DFIG for over-syn-chronous and under-synchronous opera-tion. Above synchronous speed, the four-quadrant converter operates as a generator of active power delivering power to the grid parallel to the DFIG.

What are doubly-fed induction generators (DFIGs)?

Among the VSGs, the doubly-fed induction generators (DFIGs) have been widely applied for wind farms (WFs) applications because of their advantages such as variable speed constant frequency operating capability and active/reactive power controllability.

Why do wind turbines need adjustable speed generators?

Hence, the speed of the turbine blades is allowed to increase storing energy into the turbine’s iner-tia. During this transient, output power remains practi-callyconstant,avoidingpowersurgesintothepowergrid. This article shows that adjustable speed generators for wind turbines are necessary when output power becomes higher than 1 MW.