Fig 3.12 Anatomy Of A Wind Generator
3.7 Wind Generators:
There are three main parts in horizontal axis wind turbines: (1) a rotor, (2) an alternator, and (3) a tail. The rotor blades are attached to a central hub covered by a nose cone that improves aerodynamics. Three blades are generally present in upwind generators. This entire assembly rotates when wind blows past the blades, hence the name “rotor.” In many small wind turbines the rotor is coupled to a shaft which is coupled to an alternator, a device that produces AC electricity. Fig 3.12 Anatomy of a Wind Generator
Electricity is produced by alternators which consist of two main parts: a stationary winding, known as the stator; and rotating magnets, known as the rotor. Metal magnets are preferred to electromagnets in …show more content…
The rotor blades and length of the wind turbine is one of the important aspects of the wind turbine since the power produced from the wind is also proportional to the swept area of the rotor blades i.e. the square of the diameter of the swept area. Hence, by doubling the diameter of the swept area, the power produced will be four fold increased. The rotor blades used must be strong, light and durable. As the blade length increases, these qualities of the rotor blades become more elusive. Recent advances in fibre glass and carbon-fibre technology enabled the production of lightweight and strong rotor blades as long as 30 metres. Wind turbines with the size of these rotor blades are capable to produce up to 1 megawatt of …show more content…
3.16 consists of a wind turbine followed by a power electronic converter which is connected to the stator of the generator.
Fig 3.16 Variable speed driven (gear less) wind turbine with a Synchronous Generator Cage-bar induction generator and synchronous generator are the two options available to be used. The gearbox is designed so that maximum rotor speed corresponds to rated speed of the generator. Synchronous generators or permanent-magnet synchronous generators can be designed with multiple poles which imply that there is no need for a gearbox, see Fig. 3.20. Since this “full-power” converter/generator system is commonly used for other applications, one advantage with this system is its well-developed and robust control.
3.9.3 Variable-Speed Wind Turbine with Doubly-Fed Induction Generator The wind turbine with doubly-fed induction generator is shown in fig.3.17. It shows that the stator is directly connected to the grid while the rotor winding is connected via slip rings to a converter. This system is very popular because variable-speed applications.
Fig 3.17 Variable Speed Wind Turbine with a Doubly Fed Induction Generator
There are three main parts in horizontal axis wind turbines: (1) a rotor, (2) an alternator, and (3) a tail. The rotor blades are attached to a central hub covered by a nose cone that improves aerodynamics. Three blades are generally present in upwind generators. This entire assembly rotates when wind blows past the blades, hence the name “rotor.” In many small wind turbines the rotor is coupled to a shaft which is coupled to an alternator, a device that produces AC electricity. Fig 3.12 Anatomy of a Wind Generator
Electricity is produced by alternators which consist of two main parts: a stationary winding, known as the stator; and rotating magnets, known as the rotor. Metal magnets are preferred to electromagnets in …show more content…
The rotor blades and length of the wind turbine is one of the important aspects of the wind turbine since the power produced from the wind is also proportional to the swept area of the rotor blades i.e. the square of the diameter of the swept area. Hence, by doubling the diameter of the swept area, the power produced will be four fold increased. The rotor blades used must be strong, light and durable. As the blade length increases, these qualities of the rotor blades become more elusive. Recent advances in fibre glass and carbon-fibre technology enabled the production of lightweight and strong rotor blades as long as 30 metres. Wind turbines with the size of these rotor blades are capable to produce up to 1 megawatt of …show more content…
3.16 consists of a wind turbine followed by a power electronic converter which is connected to the stator of the generator.
Fig 3.16 Variable speed driven (gear less) wind turbine with a Synchronous Generator Cage-bar induction generator and synchronous generator are the two options available to be used. The gearbox is designed so that maximum rotor speed corresponds to rated speed of the generator. Synchronous generators or permanent-magnet synchronous generators can be designed with multiple poles which imply that there is no need for a gearbox, see Fig. 3.20. Since this “full-power” converter/generator system is commonly used for other applications, one advantage with this system is its well-developed and robust control.
3.9.3 Variable-Speed Wind Turbine with Doubly-Fed Induction Generator The wind turbine with doubly-fed induction generator is shown in fig.3.17. It shows that the stator is directly connected to the grid while the rotor winding is connected via slip rings to a converter. This system is very popular because variable-speed applications.
Fig 3.17 Variable Speed Wind Turbine with a Doubly Fed Induction Generator