NL2021824B1 - Wind turbine lighting system - Google Patents

Wind turbine lighting system Download PDF

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Publication number
NL2021824B1
NL2021824B1 NL2021824A NL2021824A NL2021824B1 NL 2021824 B1 NL2021824 B1 NL 2021824B1 NL 2021824 A NL2021824 A NL 2021824A NL 2021824 A NL2021824 A NL 2021824A NL 2021824 B1 NL2021824 B1 NL 2021824B1
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NL
Netherlands
Prior art keywords
controller
light unit
wind turbine
mast
current signal
Prior art date
Application number
NL2021824A
Other languages
Dutch (nl)
Inventor
Everardus Antonius Van Der Heiden Robertus
Gerardus Goedknegt Pieter
Original Assignee
Orga Holding B V
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Orga Holding B V filed Critical Orga Holding B V
Priority to NL2021824A priority Critical patent/NL2021824B1/en
Application granted granted Critical
Publication of NL2021824B1 publication Critical patent/NL2021824B1/en

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Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B47/00—Circuit arrangements for operating light sources in general, i.e. where the type of light source is not relevant
    • H05B47/20—Responsive to malfunctions or to light source life; for protection
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
    • F03D—WIND MOTORS
    • F03D80/00—Details, components or accessories not provided for in groups F03D1/00 - F03D17/00
    • F03D80/80—Arrangement of components within nacelles or towers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
    • F03D—WIND MOTORS
    • F03D80/00—Details, components or accessories not provided for in groups F03D1/00 - F03D17/00
    • F03D80/80—Arrangement of components within nacelles or towers
    • F03D80/82—Arrangement of components within nacelles or towers of electrical components
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
    • F03D—WIND MOTORS
    • F03D80/00—Details, components or accessories not provided for in groups F03D1/00 - F03D17/00
    • F03D80/80—Arrangement of components within nacelles or towers
    • F03D80/82—Arrangement of components within nacelles or towers of electrical components
    • F03D80/85—Cabling
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B47/00—Circuit arrangements for operating light sources in general, i.e. where the type of light source is not relevant
    • H05B47/10—Controlling the light source
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/70—Wind energy
    • Y02E10/72—Wind turbines with rotation axis in wind direction

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  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Wind Motors (AREA)

Abstract

Wind turbine lighting system comprising at least one nacelle light unit, at least one tower light unit and a controller for controlling the light intensity output of the respective light units and for supplying power to the respective light units, wherein each light unit of the at least one tower light unit is configured to send a predetermined current signal to the controller Via a dedicated wiring line.

Description

Title: Wind turbine lighting system
The invention relates to a wind turbine lighting system.
The wind turbine lighting system usually comprises at least one nacelle light unit and at least one tower light unit. Additionally, a controller is provided for controlling at least the nacelle light unit and, advantageously, also the at least one tower light unit.
Usually, the controller controls the light intensity output of the nacelle light unit for example by regulating the supply power to the light unit. The controller may therefor also be called the power supply. The controller is typically located at or near the nacelle, so high up the wind turbine tower and not too far from the nacelle tower light unit. The controller may also send and/or may receive information to and/or from the nacelle tower light, such as day/night information or information on the operational state of the nacelle light unit, such as photocell failure, LED failure etc. The at least one tower light unit or a set of tower light units can be provided with its own controller. In that case, the set of tower light units may be independent of the at least one nacelle light unit. The set of tower light units may receive its power from a source other than the controller of the nacelle light unit.
However, then two controllers are provided, without any communication between these controllers. Although, in some lighting systems, a data communications line may be provided between the two controllers such that the controller associated with the nacelle light unit, that may be referred to as main controller, can be informed about the operational situation of the controller associated with the tower light units. In other lighting systems, a signal line can be provided between the two controllers, to be used solely as an on/off line to send a signal to the tower light units when it is day (off) and when it is night (on). However, then no information is available as to the operational state of the tower light units. Such a system may be costly due to the two controllers and/or separate cabling. Alternatively, the tower light units may be supplied without controller, but, then the controller associated with the nacelle light units does not have any information at all about the tower light units, which makes the operation of the lighting system rather difficult.
Therefore, there is a need for a relatively simple integration between, in particular, the at least one tower light unit and the controller, allowing a single controller and some form of communication between the tower light units and the controller.
Thereto, the invention provides for a wind turbine lighting system according to claim 1.
By providing the tower light units configured to send a predetermined current signal to the controller via a dedicated wiring line, communication between the tower light unit and the controller can be established. In particular, failure of a tower light unit can be detected by the controller. This is, in a first instance, sufficient information for the controller to know. A single tower light unit can be provided or multiple tower light units can be provided as a set of tower light units.
The tower light units are thus configured to send a predetermined current signal to the controller. The controller receives these signals and monitors the received signals. Upon detection of a missing current signal, the controller can then determine that there is a failure in one of the tower light units preventing the tower light unit to send out the current signal. The controller may then send an alert signal, for example to a remote control station, or to an operator, identifying that there is failure in one of the tower light units. As such, in a simple and reliable manner a failure indication of the tower light units can be established via a simple current signal. Since a current signal is used, the current wiring line can be a normal cable for transmitting current, such as a copper wire. Since a power cable is to be installed between the tower light units and the controller via which the power is supplied from the controller to each of the tower light units, the current wiring line can be part of the power cable, as in a multicore cable, or can be installed in the same installation handling, e.g. next to or adjacent the current cable. This makes the installation less cumbersome and more efficient, thus less costly.
Alternatively, one may consider monitoring the current through the LED elements of the individual tower light units. However, since the current through the LED elements is dependent on the temperature, it is difficult to measure a constant current throughput. Moreover, the current at the LED elements may vary due to the long distance from the controller to the individual tower right units and the voltage drop therefrom. So, this is a rather unreliable method for monitoring the tower light units, since the bandwidth in normal variation of the current is relatively large, and may be too large to monitor normal use versus failure.
The tower right unit is to be configured for sending a current signal. To that end, the local control unit in the tower light unit itself can be configured to branch off some current to send it back to the controller. Typically, one may think of current signals in a magnitude of about 1 mA to about 10 mA. For example, when there are four tower light units, each sending a predetermined current signal of 2mA. The controller then receives a total of 8mA current signal. When at a certain moment in time, the controller receives a current signal of only 6mA, the controller detects that there is 2mA missing and therefore, that there is one tower light unit that is in failure.
Advantageously, a junction box is provided that is associated with the set of tower light units, wherein each tower light unit is connected to the junction box via at least one power line and a wiring line. By providing such a junction box at or near the level of the tower light units, the tower light units can be connected in parallel to the junction box. Also, advantageously, the power line and the wiring line may be combined in a single multicore cable thereby reducing installation handhngs and costs.
Preferably, between the junction box and the controller a multicore cable is provided for feeding the power from the controller to the junction box of which one pole is the wiring line via which the predetermined current signals of the tower light units are sent. So, only a single multicore cable between the controller and the junction box is sufficient, for the power supply and for transmitting the dedicated current signals from the tower light units to the controller. Since a simple current signal is used for the notification of the tower light units to the controller, no dedicated communications infrastructure is required, thus reducing installation costs. By providing a simple multicore cable between the tower light units, in particular their associated junction box, and the controller, the interface connection of the cable with the controller can be relatively easy, since the power cable is to be connected to the controller anyway, and now a single pole of the power cable is dedicated for a current signal. This provides for a relatively large flexibility in assembly and installation. The tower manufacturer may already assemble the tower light units to the tower, but the connection of the tower light units to the controller, typically positioned in or on the nacelle, may be done upon integration of the nacelle to the tower. Since a dedicated data communication line is absent now between the tower light units and the controller, and communication, here mainly operational notification, is done via a current wiring line, the interface connection to the controller can be done in a relatively conventional way. This may also increase flexibility in assembly and/or integration of the at least one tower light unit and the at least one nacelle light unit.
Advantageously, the current signal sent by each of the tower light units is uniquely associated with the sending tower light unit. As such, the controller can not only detect whether there is a failure with one of the tower light units, but can also detect which one of the tower light units is in failure. Making the current signal unique for the tower light unit sending it, may for example be done by coding the signal, or by giving it a unique profile, e.g. square or triangle or sinus etc., or by giving each tower light unit its unique amperage for the current signal etc. For example, the tower light units may send their dedicated associated current signal in unique time intervals. When the controller detects that a current signal with a specific time interval is missing, in particular, when it is missing a subsequent numbers of time, the controller can determine which one of the tower light units did not sent its signal, and therefore, is likely to be in failure. There are many possibilities for making the current signal uniquely associated with the tower light unit sending it. In that case, when the controller detects a missing current signal, the controller can also determine which one of the tower light units is not sending a signal, and, thus, must have a failure.
Alternatively, the tower light unit may refrain from sending a signal during normal operations, but may be configured to send a signal only in case of a failure. In that case, the controller may not need to be permanently monitoring the signals, but is only be alerted when a signal arrives. This indeed may give a good indication of a failure in or to the light unit. However, when there is a wire or cable failure, or a failure in the electrical connections, no signal can be sent, although a failure should be indicated. Therefore, it is preferred to have a the light units sending a signal in normal operations, such that the absence of a signal indicates a failure.
The tower light units can send the dedicated associated current signal, uniquely or not, permanently or intermittently.
The invention further relates to a method for detecting failure of a tower light unit in a set of tower light units of a wind turbine according to claim 7.
The invention also relates to a tower light unit according to claim
10.
Further advantageous embodiments are represented in the subclaims.
The invention will further be elucidated based on a drawing. In the drawings
Figure 1 shows a schematic drawing of a wind turbine
Figure 2 shows a schematic drawing of the tower light units connected to their associated junction box.
It is noted that the drawings are only a schematic representation of the invention and are not to scale. Corresponding elements are indicated with the same or corresponding reference numbers.
Figure 1 schematically shows a wind turbine 1 comprising a wind turbine tower 2 and a nacelle 3 at a top end thereof. To the nacelle 3, the wind turbine blades 4 are connected. The wind turbine 1 is provided with a wind turbine lighting system 5 for lighting the wind turbine as an obstacle and for warning air planes and/or vessels of the obstacle. The requirements with which wind turbine lighting system 5 needs to comply are regulated in regulations such as provided by ICAO or FAA, such as, for example but not limited to, FAA AC150-5345-43H or FAA AC70-7460-1L or ICAO Annex 14 Volume I - 7th Edition, or German regulation “Allgemeine Verwaltungsvorschrift zur Kennzeichnung von Luftfahrthindernissen” as in force in 2018.
The wind turbine lighting system 5 comprises a set of nacelle light units 6. Here, two nacelle light units 6 are provided, but in some arrangements a single nacelle light unit 6 may suffice or three or more nacelle light units 6 may be provided. Further, the wind turbine lighting system 5 comprises a set of tower light units 7. The tower light units 7 are typically mounted to or through the wind turbine tower wall at a certain altitude prescribed by the applicable regulation. Further, a controller 8 is provided for controlling the power supply to the connected tower light units 7 and nacelle light units 6. The nacelle light units 6 may be connected each individually to the controller 8, since the controller 8 is usually located on or in the nacelle 3, and thus, the connection distance is relatively limited. The tower light units 7 may be provided with an associated junction box 9. Then, a power connection 10 between the controller 8 and the junction box 9 is provided. The junction box 9 can then individually connected to each tower light unit 7, so that the tower light units 7 are connected in parallel to the junction box 9. Alternatively, the tower light units 7 can be connected in parallel to the junction box 9, or directly to the controller, by cabling connecting one tower light unit to the next tower light unit etc. The junction box 9 is preferably mounted at or near the level of the tower light units 7 to reduce the losses in the connection from the junction box 9 to the tower light unit 7. The power connection 10 is preferably a multicore cable 12 via which the power is supplied to the tower light units 7, or, when a junction box 9 is provided to the junction box 9 and from there on distributed further to the individual tower light units 7.
Advantageously, each of the tower light units 7 is configured to send a predetermined current signal back to the controller 8, as shown in figure 2. Thereto, a dedicated wiring line 11 is provided between the tower light unit 7 and the controller 8, either via the junction box 9 when it is present. Since the dedicated current signal is simply a current, the dedicated wiring line 11 can be a simple current cable. Advantageously, the dedicated wiring line 11 can be part of a multicore cable, in particular it may be one pole of the multicore cable 10. As such, the communication between the tower light units and the controller 8, here in particular the failure notification, can be established in a simple and reliable manner. By using a multicore cable 10, the interface and connection to the controller 8 can be relatively simple as well. In the multicore cable, as an example, two poles may be dedicated for the power supply for visible light, two poles may be dedicated for the power supply for infrared light and one pole may be dedicated for the current signal from the tower light units 7.
The current signal sent back by the tower light units 7 to the controller 8 is preferably uniquely associated to the tower light unit sending the current signal. This may be done by coding the current signal, for example by modulating the current in a predetermined code or pattern, e.g. pulse shaped, and by combining or counting the pulses at the controller and comparing it to a stored code or pattern, the location of origin of the current can be determined. Coding may also be done for example by shaping the current in a sign wave or triangular shape. By decoding the current shape in the controller and comparing it to stored shape, the location of origin of the current signal can be determined. Upon commissioning of the wind turbine lighting system, the controller is configured as to establish which tower light unit and/or which nacelle light unit is associated with which unique code. The tower light units 7 are advantageously configured for uniquely coding the current signal. Upon installation, and, preferably, upon commissioning of the wind turbine lighting system, the controller 8 receives input as to which coding is associated to which tower light unit, such that, when a coded signal is absent, the controller 8 can detect which tower light unit is in failure.
The invention is explained in combination with tower light units that are configured to send a current signal to the controller. Of course, in the same way, the nacelle light unit or nacelle light units can send a relatively simple current signal, uniquely associated with the sending light unit or not, to the controller such that the controller can also monitor the operational status of the at least one nacelle light unit. As such with a relatively simple current wiring, e.g. as a part of a multicore cable, monitoring of the operational state of the nacelle light units and/or of the tower light units is possible. This may be advantageous in terms of simplicity and costs.
Many variants are possible. Instead of providing a unique code, the length of the current signal may be uniquely associated to a tower light unit and/or a time interval with which the current signal is transmitted by each of the tower light units may be unique for each of the tower light units. Alternatively, the shape or profile of the current signal can be different for each of the tower light units, e.g. block shaped, or triangle shaped or sinusoidal etc. Or, alternatively, the amplitude or height of the current signal can be different for each of the tower light units. It may be preferably so different
For the purpose of clarity and a concise description features are described herein as part of the same or separate embodiments, however, it will be appreciated that the scope of the invention may include embodiments having combinations of all or some of the features described. In view of this passage it is evident to the skilled reader that the variants of claim 1 as filed may be combined with other features described in the application as filed, in particular with features disclosed in the dependent claims, such claims usually relating to the most preferred embodiments of an invention.
In the claims, any reference signs placed between parentheses shall not be construed as limiting the claim. The word ‘comprising’ does not exclude the presence of other features or steps than those listed in a claim. Furthermore, the words ‘a’ and ‘an’ shall not be construed as limited to ‘only one’, but instead are used to mean ‘at least one’, and do not exclude a plurality. The mere fact that certain measures are recited in mutually different claims does not indicate that a combination of these measures cannot be used to an advantage. Many variants will be apparent to the person skilled in the art. All variants are understood to be comprised within the scope of the invention defined in the following claims.

Claims (11)

1. Windturbine-verlichtingssysteem omvattende ten minste één gondel-lichteenheid, ten minste één mast-lichteenheid en een controller voor het regelen van de lichtintensiteitsopbrengst van de lichteenheden en voor het leveren van energie aan de lichteenheden, waarbij elke lichteenheid van de ten minste ene mast-lichteenheid is ingericht om een vooraf bepaald stroomsignaal te sturen naar de controller via een daartoe uitgeruste bedradingskabel.Wind turbine lighting system comprising at least one nacelle light unit, at least one mast light unit and a controller for controlling the light intensity output of the light units and for supplying energy to the light units, each light unit of the at least one mast light unit is arranged to send a predetermined power signal to the controller via a dedicated wiring cable. 2. Windturbine-verlichtingssysteem volgens conclusie 1, verder omvattende een aansluitdoos die geassocieerd is met de ten minste ene mast-lichteenheid, waarbij elke mast-lichteenheid is verbonden met de aansluitdoos via ten minste één energiekabel en een bedradingskabel.The wind turbine lighting system of claim 1, further comprising a junction box associated with the at least one mast light unit, each mast light unit being connected to the junction box via at least one power cable and a wiring cable. 3. Windturbine-verlichtingssysteem volgens conclusie 2, waarbij tussen de aansluitdoos en de controller een meerkerns kabel is verschaft voor het voeden van de energie van de controller naar de aansluitdoos, waarvan één kern de bedradingskabel is waardoor de vooraf bepaalde stroomsignalen van de mast-lichteenheden worden verstuurd.The wind turbine lighting system of claim 2, wherein a multi-core cable is provided between the junction box and the controller for feeding the energy from the controller to the junction box, one core of which is the wiring cable through which the predetermined power signals from the mast light units be sent. 4. Windturbine-verlichtingssysteem volgens één van de voorgaande conclusies, waarbij de controller is ingericht om de vooraf bepaalde stroomsignalen van elk van de mast-lichteenheden te monitoren.Wind turbine lighting system according to any of the preceding claims, wherein the controller is arranged to monitor the predetermined current signals from each of the mast light units. 5. Windturbine-verlichtingssysteein volgens conclusie 4, waarbij de controller is ingericht om een alarmsignaal uit te voeren bij detectie van ten minste één missend vooraf bepaald stroomsignaal.The wind turbine lighting system of claim 4, wherein the controller is arranged to output an alarm signal upon detection of at least one missing predetermined power signal. 6. Windturbine-verlichtingssysteem volgens één van de voorgaande conclusies, waarbij het vooraf bepaalde stroomsignaal uniek geassocieerd is met één van de mast-lichteenheden.Wind turbine lighting system according to any of the preceding claims, wherein the predetermined current signal is uniquely associated with one of the mast light units. 7. Werkwijze voor het detecteren van storing van een mastlichteenheid in een verzameling van ten minste één mast-lichteenheid van een windturbine, omvattende:A method for detecting malfunction of a mast light unit in a set of at least one mast light unit of a wind turbine, comprising: - het verschaffen van een controller die is ingericht voor het leveren van energie aan de ten minste ene mast-lichteenheid;- providing a controller adapted to supply energy to the at least one mast lighting unit; -het verschaffen van de ten minste ene mast-lichteenheid die is ingericht voor het sturen van een vooraf bepaald stroomsignaal naar de controller;- providing the at least one mast light unit adapted to send a predetermined current signal to the controller; - de ten minste ene mast-lichteenheid die een vooraf bepaald stroomsignaal naar de controller stuurt;- the at least one mast-light unit that sends a predetermined current signal to the controller; - het monitoren van het de ontvangen ten minste ene vooraf bepaalde stroomsignaal door de controller;- monitoring the received at least one predetermined current signal by the controller; - het uitvoeren van een alarmsignaal door de controller bij detectie van ten minste één missend vooraf bepaald stroomsignaal.- outputting an alarm signal by the controller upon detection of at least one missing predetermined current signal. 8. Werkwijze volgens conclusie 7, waarbij het vooraf bepaalde stroomsignaal uniek geassocieerd is met een enkele mast-lichteenheid, bijvoorbeeld door coderen.The method of claim 7, wherein the predetermined current signal is uniquely associated with a single mast light unit, for example by encoding. 9. Werkwijze volgens conclusie 7 of 8, waarbij het vooraf bepaalde stroomsignaal een stroom van ongeveer 1 mA tot ongeveer 10 mA omvat.The method of claim 7 or 8, wherein the predetermined current signal comprises a current from about 1 mA to about 10 mA. 10. Mast-lichteenheid ter bevestiging aan een mast van een windturbine, waarbij de mast-lichteenheid is ingericht voor het sturen van een vooraf bepaald stroomsignaal via een daartoe uitgeruste bedradingskabel.10. Mast light unit for attachment to a mast of a wind turbine, the mast light unit being arranged for controlling a predetermined current signal via a wiring cable equipped for this purpose. 11. Mast-lichteenheid die is ingericht voor gebruik in een windturbineverlichtingssysteem volgens één van de conclusies 1-6.Mast light unit adapted for use in a wind turbine lighting system according to any one of claims 1-6.
NL2021824A 2018-10-16 2018-10-16 Wind turbine lighting system NL2021824B1 (en)

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20030122680A1 (en) * 2001-12-31 2003-07-03 Ardelan John Patrick Integrated radio tower light controller and alarm reporting device
US20080192460A1 (en) * 2005-01-19 2008-08-14 Aloys Wobben Rod Shaped Light for Marking a Tower with Lights
WO2008112820A2 (en) * 2007-03-12 2008-09-18 Cirrus Logic, Inc. Power control system for current regulated light sources
US20140377060A1 (en) * 2010-09-24 2014-12-25 RE Power Systems SE Offshore wind farm illumination
CA3033320A1 (en) * 2016-08-09 2018-02-15 Wobben Properties Gmbh Luminous element and method for illuminating a component of a wind energy installation, and components for a wind energy installation and wind energy installation

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20030122680A1 (en) * 2001-12-31 2003-07-03 Ardelan John Patrick Integrated radio tower light controller and alarm reporting device
US20080192460A1 (en) * 2005-01-19 2008-08-14 Aloys Wobben Rod Shaped Light for Marking a Tower with Lights
WO2008112820A2 (en) * 2007-03-12 2008-09-18 Cirrus Logic, Inc. Power control system for current regulated light sources
US20140377060A1 (en) * 2010-09-24 2014-12-25 RE Power Systems SE Offshore wind farm illumination
CA3033320A1 (en) * 2016-08-09 2018-02-15 Wobben Properties Gmbh Luminous element and method for illuminating a component of a wind energy installation, and components for a wind energy installation and wind energy installation

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