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Using KERS brake in wind turbines

IP.com Disclosure Number: IPCOM000191793D
Original Publication Date: 2010-Jan-25
Included in the Prior Art Database: 2010-Jan-25
Document File: 2 page(s) / 78K

Publishing Venue

Siemens

Related People

Juergen Carstens: CONTACT

Abstract

Usually, wind turbines are designed for a specific power production. However, the rotor speed increases with the wind speed. If the rotor speed reaches a certain limit, the wind turbine has to be limited in its power production. Otherwise the wind blows too fast and material damages can be caused. Up to now, the rotor speed is limited during operation by using a pitch system. One advantage of using a pitch system is that the wind speed exceeds the maximal value of the pitch system, the wind turbine has to be stopped and thus no energy can be produced.

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Using KERS brake in wind turbines

Idea: Ana Maria Benitez Sanchez, DE-Aachen; Cong Nguyen, DE-Aachen

Usually, wind turbines are designed for a specific power production. However, the rotor speed

increases with the wind speed. If the rotor speed reaches a certain limit, the wind turbine has to be

limited in its power production. Otherwise the wind blows too fast and material damages can be

caused. Up to now, the rotor speed is limited during operation by using a pitch system. One advantage

of using a pitch system is that the wind speed exceeds the maximal value of the pitch system, the

wind turbine has to be stopped and thus no energy can be produced.

Therefore, a novel solution is proposed which slows down the rotor by using a brake system. The

brake system is called Kinetic Energy Recovery System (KERS) and uses the emerging kinetic energy

to produce the demanded energy. The KERS can be installed in addition to a pitch system or can

replace the pitch system. The KERS is placed between the rotor and the main bearing in order to

prevent torsional overload on the drive train components (see Figure 1). The kinetic energy is then

transferred from the main shaft to a recovery system. For example a shiftable clutch attached on the

main shaft can be used for the transfer. The energy can be cumulated in batteries or is put directly to

the grid, for ins...