HEAD

Wednesday 14 October 2015

Schemes For Wind Turbine

Usually in Our Country Wind turbines are only used, in some places where the rated wind speed is achieved for maximum efficiency.Hence we introduce the various topologies based on the two major types of generators:

  I. Induction Generator or Asynchronous Generator
 II. Synchronous Generator

Asynchronous Generator

This category consists of three further types i.e

1)  Squirrel cage induction generator


It is simple and robust.Easy and cheap for mass production. It enables stall regulated machines to operate at a constant speed when it is connected to a large grid, which provides a stable control frequency.It doesn’t have current harmonics since it has no frequency conversion.


2) Wound Rotor Induction Generator

As compared to the previous scheme, this configuration has a wider range of speeds above synchronous speed, thus making it more suitable.


3) Doubly fed Induction Generator
Ability to produce more output than its rated power without being overheated. Ability of transferring maximum power both in sub-synchronous and super synchronous modes. Converter is connected to rotor, so its power rating is reduced and the whole power flows through the stator.

Synchronous Generator

This category consists of ;

1)PERMANENT MAGNET SYNCHRONOUS GENERATOR (PMSG)
Light weight and small size in construction.Low losses and high efficiency. No need of external excitation current. It is useful for small wind turbines, but for large wind turbines the size of the magnet has to be increased.