DFIG

Doubly-fed electric machines are basically electric machines that are fed AC currents into both the stator and the rotor windings. Hence they are called doubly-fed induction generators or double output induction generators in the generator mode. The primary advantage of doubly-fed induction generators when used in wind turbines is that they allow the amplitude and frequency of their output voltages to be maintained at a constant value, no matter the speed of the wind blowing on the wind turbine rotor. Due to this DFIG can be directly connected to the Grid network and remain synchronized at all times with the AC power network.

The stator windings of DFIGs are directly connected to the grid, and rotor windings are connected to the grids through back-to-back power electronic converters (Rotor side converter (RSC) and grid side converter (GSC). By a suitable control algorithm, the DFIG is able to work as a generator in both sub-synchronous and super-synchronous modes.

Motor set up for – DFIG System: One number of 3Ø Slip ring induction motor coupled with DC Motor with Common base plate and all inputs are terminated by banana connectors.

Speed Sensor: One number of QEP(512PPR) sensors is used to sense the speed and position of the generator.

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