#1.What is a Generator?
#2.Type of Generators
Used in Danish wind turbines that are directly coupled with the grid and use a soft starter for grid connection.
Permanent Magnet Sync. Generator
Enercon, EWT, etc. use this type of generator as this design does not need a gearbox, but for grid connection, a Complete Converter is required.
Doubly Fed Induction Generator
This type of generator for 1MW to 3.5MW turbines became very popular in the last decade. The reason is that it allows limited variable speed operation and has an electronic partial power converter connected to the side of the rotor which significantly reduces the cost.
These are used in turbines based on both Gearless and Gearbox. They use the power converter to a full scale. Electromagnets are used instead of permanent magnets because it is costly to make highly efficient permanent magnets, and rapidly depleting rare earth metals.
Induction Generator with slip ring
The generator is connected directly to the grid and the rotor current control enables a certain degree of variable speed operation (by adding/removing resistance to the rotor winding with the aid of electronic power switches).
All these types of generators can be seen in wind turbines on the utility-scale. Some are more popular than others, due to ease of design, expense, operational reliability, and serviceability.
#3.Synchronous and Asynchronous
The synchronous generator is divided into two parts, one of which is a stator made up of a certain number of magnetic files and the other is a rotor. The generator is called asynchronous term because the rotating part of the generator rotates at a constant speed which coincides with the speed of rotation of the magnetic field. Note that the speed of rotation is determined by the number of poles in the generator.
#4.The way how generators producing electricity
#5.Generators for medium power Wind Turbines
#6.Properties of Wind and water turbine alternators(Generators)
- No speed multiplier, no gearbox
- No maintenance
- High efficiency
- Simplification of mechanical design
- Easy mechanical interface