Patent Application
20100090463
The present disclosure generally relates to an environmental monitoring apparatus adapted for the detection of environmental conditions. Specifically, the present disclosure relates to an environmental monitoring apparatus adapted for measuring wind conditions in the vicinity of a wind turbine adapted to convert wind energy, i.e. natural energy, into electrical energy.
Wind turbines are used to convert wind energy into electrical output energy, wherein a wind turbine including a tower, a machine nacelle and a rotor having a plurality of rotor blades and a hub can be adjusted with respect to the incoming wind direction. The machine nacelle arranged atop the tower is rotatable about a vertical axis, e.g. the tower axis.
In order to rotate the machine nacelle about the tower axis, energy is provided for actuators that rotate the machine nacelle with respect to the incoming wind direction. In case of a grid failure, e.g. in a case where only little or no external energy may be provided, such kind of active adjustment of the machine nacelle is not possible. Due to the grid failure no electrical energy can be provided. Thus it is not possible to yaw towards the incoming wind direction and the hub of the wind turbine cannot be directed towards the incoming wind.
In view of the above, an environmental monitoring apparatus adapted for detecting at least one environmental condition is provided, the environmental monitoring apparatus including a transducer device adapted for converting the detected environmental conditions into an electrical detection signal, and a converter device adapted for converting energy provided by the environment into electrical output energy, wherein the transducer device and the converter device are formed as an associated unit.
According to another aspect a wind turbine is provided including a tower, a machine nacelle and a rotor having a plurality of rotor blades and a hub, said wind turbine further including at least one environmental monitoring apparatus adapted for detecting environmental conditions, having a transducer device adapted for converting the detected environmental conditions into an electrical detection signal, and a converter device adapted for converting energy provided by the environment into electrical output energy, wherein the transducer device and the converter device are formed as an associated unit.
According to yet another aspect a wind speed sensor device for measuring a wind speed vector (magnitude of wind speed and wind direction) is provided, said wind speed sensor device including an anemometer means and a signal processing means for analysing an anemometer output signal, said wind speed sensor device further including a means adapted for converting mechanical energy provided by wind forces into electrical energy, wherein the electrical energy is provided for electrical devices as an auxiliary power supply.
According to yet another aspect a wind turbine including a tower, a machine nacelle and a rotor having a plurality of rotor blades and a hub is provided, said wind turbine further including at least one wind speed sensor device having an anemometer means and a signal processing means adapted for analysing an anemometer output signal, wherein the at least one wind speed sensor device includes an auxiliary power generator adapted for supplying auxiliary power to electrical devices of the wind turbine, wherein the anemometer means is adapted for driving the auxiliary power generator.
According to yet another aspect a method for measuring environmental conditions of a wind turbine including a tower, a machine nacelle and a rotor having a plurality of rotor blades and a hub is provided, said method further including the steps of detecting the environmental conditions of the wind turbine by means of a transducer device, and supplying auxiliary power to electrical devices of the wind turbine by means of a converter device, wherein the transducer device and the converter device are formed as an associated unit.
A full and enabling disclosure of the present invention, including the best mode thereof, to one of ordinary skill in the art is set forth more particularly in the remainder of the specification including reference to the accompanying drawings wherein:
Reference will now be made in detail to the various exemplary embodiments, one or more examples of which are illustrated in the drawings. Each example is provided by way of explanation and is not meant as a limitation. For example, features illustrated or described as part of one embodiment can be used on or in conjunction with other embodiments to yield yet a further embodiment. It is intended that the present disclosure includes such modifications and variations.
A number of embodiments will be explained below. In this case, identical structural features are identified by identical reference symbols in the drawings. The structures shown in the drawings are not depicted true to scale but rather serve only for the better understanding of the embodiments.
The machine nacelle 103 is adapted to rotate about a tower axis 107 by a predefined amount, e.g. by a yaw angle 106. The machine nacelle 103 furthermore includes a gear box 109 which is used to connect a main shaft of the rotor to a generator adapted for supplying electrical output energy.
In order to increase the energy conversion efficiency, a rotor axis 108 may be adjusted with respect to an incoming wind direction 105. Specifically, the rotor axis 108 can be adjusted in order to point towards the incoming wind direction 105, as it is depicted more clearly in
It is noted here that the adjustment of the nacelle 103 is required in order to withstand possible storms in case of a grid loss. During a storm the nacelle is directed towards the incoming wind because storm loads are lower when the wind comes from the front.
It is noted here that the term “associated” also includes the meaning “integrated”. Furthermore, “integrated” means any arrangement known in the art so as to reduce costs, or increase power output, or to formulate an efficiency between the components, and does not necessarily mean mechanically coupled to, even though this is one typical embodiment, and may encompass a less preferred configuration where two components are spaced a predetermined distance from one another but share components, or a connection point, data or other integrated relationship while not being mechanically or electrically coupled to one another. “Integrated” may encompass a configuration where the transducer has a housing and the converter has a second housing, and the components simply share a larger housing, or share a connection point, or are integrated to simply share data. Less preferably, the components may simply be arranged to share at least one functional or spatial relationship relative to one another.
Specifically, the associated transducer/converter device can be used to provide electrical output energy which is used to charge an accumulator unit (battery system, energy storage system) which then can provide sufficient power to yaw the machine nacelle 103 about the tower axis 107 in case of a grid failure. Furthermore, the associated transducer/converter device can be used as an environmental monitoring apparatus adapted for the detection of environmental conditions of the wind turbine.
The associated transducer/converter device 200 may be arranged rotatable with respect to the machine nacelle 103 about a substantially vertical axis in order to direct the associated transducer/converter device 200 towards the incoming wind direction. Energy which is required for such a rotation may be supplied via a solar cell mounted at the associated transducer/converter device 200. Furthermore the associated transducer/converter device 200 may be self aligning. The associated transducer/converter device 200 may be an anemometer means.
The electrical detection signal 302 which is output by the transducer device 401 of the associated transducer/converter device 200 is fed to a processor unit 403 which is adapted to process the electrical detection signal 302 such that a process detection signal 305 can be provided. The process detection signal 305 can be used to measure environmental conditions of the wind turbine 100 shown in
According to a typical embodiment, the associated transducer/converter device includes a converter device 402 which converts environmental energy 303 provided by the environment of the wind turbine 100 into electrical output energy 304. The environmental energy 303 which is input into the converter device 402 of the associated transducer/converter device 200 may be wind energy (i.e. mechanical energy) or light energy (light intensity). The output energy 304 output by the converter device 402 of the associated transducer/converter device may be used as energy in order to provide a yawing of the machine nacelle 103 about the tower axis 107.
Furthermore, it is possible (although not shown in
According to the typical embodiment shown in
In the typical embodiment shown in
It is noted here that the associated transducer/converter device is not restricted to transducer devices for measuring wind conditions. In addition to the measurement of wind conditions, it is possible to monitor light intensities wherein the transducer device is a light intensity sensor and the converter device is a solar cell.
In the typical embodiment shown in
Furthermore, the wind speed and wind direction sensor is adapted to detect wind turbulences.
As an estimate, for a typical wind turbine 100 the yawing power which is required in order to yaw the nacelle 103 of the wind turbine 100 towards the incoming wind direction 105 the yawing power is 6 kW with a peak at 11 kW.
This amount of power may be provided by an accumulator unit or a battery system which is charged using the auxiliary power supply over a long time. During yawing the stored energy is consumed in a comparatively short time.
Furthermore, environmental conditions such as wind directions and wind turbulence can be measured even if the environmental conditions are changing rapidly.
The first and second transducer/converter devices 201 and 202 are arranged having their axes substantially orthogonal to each other and at an angle of about 45° with respect to the rotor axis 108. Thus, different wind directions can be measured and wind energy can be converted into electrical energy even if the incoming wind direction 105 does not coincide with the rotor axis 108. The arrangement of the two transducer/converter devices 201, 202 is such that at least one of the two transducer/converter devices 201, 202 is directed substantially towards the incoming wind direction. Thus it is possible, according to the typical embodiments shown in
It is noted here that more than two associated transducer/converter devices 200, 201, 202 may be arranged at the wind turbine 100. Furthermore, it is possible, besides arranging the at least one associated transducer/converter device 200 atop the machine nacelle, that the at least one associated transducer/converter device 200 may be arranged directly at the tower 102. In this case, the at least one associated transducer/converter device does not rotate together with the machine nacelle about the horizontal tower axis 107.
The transducer device 401 and the converter device 402 are formed as an associated unit. Furthermore, the transducer device 401, the converter device 402 and the processor unit 403 may be formed as an associated unit. The at least two transducer/converter devices 201, 202 are arranged at the machine nacelle with their detection axes oriented substantially orthogonal to each other.
In case the transducer device 401 as depicted in
The wind speed sensor device for measuring a wind speed vector may include an anemometer means and a signal processing means for analysing the anemometer output signal. The wind speed sensor device may further include a means for converting mechanical energy provided by wind forces into electrical energy, wherein the electrical energy is provided for electrical devices as an auxiliary power supply.
The wind turbine 100 may include at least the anemometer means and the signal processing means for analyzing an anemometer output signal.
The method for measuring environmental conditions of a wind turbine including a tower, a machine nacelle and a rotor having a plurality of rotor blades and a hub, includes the steps of detecting the environmental conditions of the wind turbine by means of a transducer device, and supplying auxiliary power to electrical devices of the wind turbine by means of a converter device, wherein the transducer device and the converter device are formed as an associated unit.
The steps of detecting the environmental conditions of the wind turbine 100 and the steps of supplying auxiliary power to electrical devices of the wind turbine 100 may be carried out independently. In addition to that, the steps of detecting the environmental conditions of the wind turbine and of supplying auxiliary power to electrical devices of the wind turbine may be carried out in an interleaved manner.
Furthermore, the steps of detecting the environmental conditions of the wind turbine 100 and of supplying auxiliary power to electrical devices of the wind turbine may be carried out simultaneously.
The auxiliary power may be used, as an example, for the yawing and/or pitching of the rotor blades of the wind turbine.
The yawing may be performed in different modes including at least one of different yaw speeds, different settings for a maximum allowed cable twist and a maximum allowed yaw misalignment. These modes may be selected based on various inputs such as past and actual wind speed, accumulator energy level, yaw misalignment, grid availability, etc.
The invention has been described on the basis of embodiments which are shown in the appended drawings and from which further advantages and modifications emerge. However, the invention is not restricted to the embodiments described in concrete terms, but rather can be modified and varied in a suitable manner. It lies within the scope of the invention to combine individual features and combinations of features of one embodiment with features and combinations of features of another embodiment in a suitable manner in order to arrive at further embodiments.
It will be apparent to those skilled in the art, based upon the teachings herein, that changes and modifications may be made without departing from the invention disclosed and its broader aspects. That is, all examples set forth herein above are intended to be exemplary and non-limiting.
