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Nuevo método de control de guiñada activo, preciso y rentable para aerogeneradores de eje horizontal

Resumen

Tipo:
Oferta Tecnológica
Referencia:
TOGR20170109001
Publicado:
19/01/2017
Caducidad:
19/01/2018
Resumen:
Un laboratorio griego especializado en diseño y desarrollo de técnicas y dispositivos de ahorro energético y alto rendimiento ha desarrollado un método mejorado de control de guiñada activo, preciso y rentable para aerogeneradores de eje horizontal. Este método, que no necesita medir la dirección del viento, puede aplicarse en aerogeneradores con cualquier tipo de generador eléctrico y permite maximizar la energía generada con el mismo potencial de energía eólica. El laboratorio busca socios industriales en Reino Unido, Alemania, Francia, Austria y España con el fin de establecer acuerdos de cooperación técnica para continuar con el desarrollo y para la explotación comercial de la tecnología.



Details

Tittle:
Innovative, accurate and low-cost active yaw control technique from Greece for horizontal axis wind systems
Summary:
A Greek laboratory, specialized in the design and development of efficiency-increase and energy-saving techniques and devices, has developed an improved accuracy and low-cost active yaw control technique for horizontal axis wind systems that does not require wind direction measurement. The client is looking for collaboration with industrial partners from UK, Germany, France, Austria, and Spain interested in technical co-operation agreement for further development and commercial exploitation.
Description:
The main activity of this Greek university laboratory is to conduct research in all aspects of electrical machines. It particularly specializes in the development of control techniques and prototypes for energy saving in several industrial and domestic electric motion applications. For over 3 decades, the laboratory personnel have worked on issues related to efficiency optimization in electric motor and generator drives. It has acquired significant experience and a high level of know-how in its specific field, and has participated in a number of national and EU-funded research projects.

Its primary research activities are in the following areas:-
- design and analysis of electric machines,
- power electronic converters,
- design and modelling of electric machine drives,
- loss minimization control for electric machine drives (motors and generators),
- control and design optimization of electric motors and generators,
- energy conversion systems for renewable sources (wind and photovoltaic systems) and
- energy saving in domestic applications.

Yaw misalignment (deviation between rotor axis and wind direction) is one of the reasons that a wind turbine does not provide maximum output energy. It reduces the wind velocity component acting perpendicularly to the rotor plane, and thus reduces the effective swept area with respect to the wind direction. The energy loss depends on the yaw error and wind speed. The average annual energy loss due to yaw error may range from 2.7% and reach up to 11% for average yaw error of 20 degrees. Therefore, if the turbine is to fully capture the power of the wind, it should be correctly oriented to the wind inflow.

One of the most common methods for estimating the yaw error is to measure the wind direction by a sensor installed at the back end of the nacelle. However, the measurement suffers from inaccuracies caused by the vortices in the wake of the flow downstream of a wind turbine. Several remote sensing instruments based on laser and hypersonic technologies have been proposed, in order to achieve accurate wind direction measurement. However, these solutions are expensive, and thus are only affordable for high power wind turbines.

The new active yaw control method developed by the Greek laboratory can be implemented without needing the measurement of the wind direction. It is accurate and it is not influenced by the wake of the turbine blades. Also it is cost-effective, because there is no need for accurate remote sensing instruments of the wind direction that are usually very expensive. Therefore, the yaw control method is affordable and can be applied to low power wind systems. However, its benefits are even greater when used in high power systems because of the higher amount in power increase.

The new active yaw control mechanism is based on a combined control scheme that achieves both MPPT operation and accurate orientation of the turbine to the wind direction. Thus, increased power extraction form the incident wind can be achieved, resulting in increased electrical power production. The increase in the electrical power is higher at high power wind system. However, since this new yaw control technique is based on updated firmware from an existing active yaw platform, it is affordable and can also be applied to low power wind systems.

The Greek client is looking for collaboration with industrial partners from the UK, Germany, France, Austria, and Spain that are interested in technical co-operation agreement for further development and commercial exploitation of the methodology developed by the Greek university laboratory.
Advantages and Innovations:
This university laboratory has developed an improved accuracy and low-cost active yaw control technique for horizontal axis wind systems. The new yaw control does not require the measurement of the wind direction and it can be applied in wind systems with all types of electrical generators (induction generators, permanent magnet synchronous generators and doubly-fed induction generators). It operates in unison with the maximum power point tracking control scheme, thus allowing for the maximization of the generated power from the same wind energy potential.

The new yaw control technique indirectly measures the wind direction and so it is not influenced by inaccuracies that may be caused by the vortex flow downstream of the blades, which may be observed in methods based on direct measurement of the wind direction by sensors installed at the rear part of the nacelle. Also, the new yaw control method is cost-effective, because there is no need for remote instruments in order to sense the wind direction. These instruments are usually very expensive and therefore are affordable only for high power wind systems. Since this new technique does not require such remote sensing devices, it is much lower in cost.

Additionally, any discrepancies caused by the rotating rotor (when the wind speed is measured) are captured with satisfactory accuracy from the rotor aerodynamic model, and thus can be taken into consideration in the data processing.
Stage of Development:
Under development/lab tested
IPs:
Secret Know-how,Patent(s) applied for but not yet granted

Partner sought

Type and Role of Partner Sought:
Potential co-operation with industrial partners or manufacturing companies in the following fields:-
- renewable energy equipment / systems (wind systems),
- wind sensors
- power converters and
- electrical generators.
The potential partner could be of any size. The most important factor is his interest and sufficient capacity for further development and commercial exploitation of the technique developed by the Greek university laboratory.

Client

Type and Size of Client:
University
Already Engaged in Trans-National Cooperation:
Si
Languages Spoken:
English
Greek

Dissemination

Restrict dissemination to specific countries:
Austria, France, Germany, Spain, United Kingdom

Keywords

Technology Keywords:
04007001 Gestión de la energía