Wind turbine with control network and monitoring network

Abstract

A wind turbine comprising a control network is provided. The control network comprises control network nodes with one or more control network nodes in the rotor and one or more control network nodes in the nacelle. Also provided is a monitoring network comprising monitoring network nodes with one or more monitoring network nodes in the rotor and one or more monitoring network nodes in the nacelle. The optical fiber is shared by two networks and extends between the nacelle and the rotor. A first wavelength division multiplexer / demultiplexer and a second wavelength division multiplexer / demultiplexer are disposed in the rotor and the nacelle.

Description

Technical Field

[0001] The invention relates to a wind turbine comprising a control network and a monitoring network. The invention also relates to a method of processing communication signals in a wind turbine network. Background Art

[0002] Wind turbines may utilize optical communication systems for various purposes, typically in the form of control signal communication and monitoring signal communication. Such signals may be handled by a dedicated communication network. Ideally, communication between the control network and the monitoring network of a wind turbine should be blocked to comply with cybersecurity standards. Summary of the invention

[0003] A first aspect of the present invention provides a wind turbine, the wind turbine comprising: a nacelle; a rotor rotatably mounted on the nacelle, the rotor comprising a hub and blades extending from the hub; a control network comprising control network nodes connected via a first network, the control network nodes comprising one or more first control network nodes in the rotor and one or more second control network nodes in the nacelle; a monitoring network comprising monitoring network nodes connected via a second network, the monitoring network nodes comprising one or more first monitoring network nodes in the rotor and one or more second monitoring network nodes in the nacelle; an optical fiber shared by the first network and the second network and extending between the nacelle and the rotor; a first wavelength division multiplexing (WDM) in the rotor a first wavelength division multiplexer / demultiplexer in the nacelle, wherein: the first wavelength division multiplexer / demultiplexer is configured to receive the nacelle-limited light and multiplex the nacelle-limited light onto the optical fiber; the first wavelength division multiplexer / demultiplexer is configured to demultiplex the rotor-limited light from the optical fiber and route it to a control network or a monitoring network based on the wavelength of the rotor-limited light; the second wavelength division multiplexer / demultiplexer is configured to demultiplex the nacelle-limited light from the optical fiber and route it to a control network or a monitoring network based on the wavelength of the nacelle-limited light; and the second wavelength division multiplexer / demultiplexer is configured to multiplex the rotor-limited light onto the optical fiber. 2022P00008WOCN(KIHHA)

[0004] Optionally, at least one of the first monitoring network nodes and at least one of the second monitoring network nodes comprises a monitoring element configured to monitor the wind turbine and generate monitoring data.

[0005] Optionally, the second network is configured to receive the monitoring data and transmit the monitoring data to a substation remote from the wind turbine.

[0006] Optionally, the second network is configured to transmit the monitoring network data to the monitoring network node.

[0007] Optionally, the monitoring network data includes configuration data or command data.

[0008] Optionally, at least one of the first control network nodes and at least one of the second control network nodes comprises a control element configured to control the wind turbine based on the control data, and the first optical fiber network is configured to transmit the control data to the control element.

[0009] Optionally, the first wavelength division multiplexer / demultiplexer and / or the second wavelength division multiplexer / demultiplexer are configured to operate passively.

[0010] Optionally, the optical fiber is a multimode optical fiber.

[0011] Optionally, the first wavelength division multiplexer / demultiplexer is located in the hub.

[0012] Optionally, the control network and the monitoring network each comprise a respective transmitter in the rotor, and the transmitter in the rotor is configured to generate nacelle-limited light of a respective wavelength and feed it to the first wavelength division multiplexer / demultiplexer.

[0013] Optionally, the control network and the monitoring network each include a corresponding transmitter in the nacelle, and the transmitter in the nacelle is configured to generate rotor-limited light of a corresponding wavelength and feed it to the second wavelength division multiplexer / demultiplexer.

[0014] Optionally, the control network and the monitoring network each include a corresponding receiver in the rotor, and the receivers in the rotor are each configured to receive rotor-limited light of a corresponding wavelength from the first wavelength division multiplexer / demultiplexer and convert the rotor-limited light into an electrical signal.

[0015] Optionally, the control network and the monitoring network each include a corresponding receiver in the nacelle, and the receivers in the nacelle are each configured to receive a nacelle-limited light of a corresponding wavelength from the second wavelength division multiplexer / demultiplexer and convert the nacelle-limited light into an electrical signal.

[0016] Another aspect of the present invention provides a method for processing communication signals in a wind turbine network, the wind turbine comprising: a nacelle; a rotor rotatably mounted on the nacelle, the rotor comprising a hub and blades extending from the hub; a control network comprising control network nodes connected via a first network, the control network nodes comprising one or more first control network nodes in the rotor and one or more second control network nodes in the nacelle; a monitoring network comprising a control network node connected via a second network 2022P00008WOCN(KIHHA)

[0017] A method for controlling a rotor and a rotor is disclosed in claim 1, wherein the monitoring network nodes include one or more first monitoring network nodes in a rotor and one or more second monitoring network nodes in a nacelle; and an optical fiber shared by the first network and the second network and extending between the nacelle and the rotor, the method comprising: receiving nacelle-limited light and multiplexing the nacelle-limited light onto the optical fiber; demultiplexing rotor-limited light from the optical fiber and routing it to a control network or a monitoring network based on the wavelength of the rotor-limited light; demultiplexing nacelle-limited light from the optical fiber and routing it to a control network or a monitoring network based on the wavelength of the nacelle-limited light; and multiplexing the rotor-limited light onto the optical fiber. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Embodiments of the present invention will now be described with reference to the accompanying drawings, in which:

[0019] Figure 1 A wind turbine is shown;

[0020] Figure 2 A control system for a wind turbine is shown;

[0021] Figure 3 Elements of a monitoring network and a control network for a wind turbine are shown;

[0022] Figure 4 shows the monitoring network and control network in greater detail; and

[0023] Figure 5 The optical transceiver / duplexer is shown in detail. DETAILED DESCRIPTION

[0024] Figure 1 A wind turbine 1 is shown comprising a nacelle 3 mounted on a tower 2. A rotor 4, 5 is rotatably mounted to the nacelle 3. The rotor comprises a hub 4 and blades 5 extending from the hub. In this example, the rotor comprises three blades 5. The nacelle 3 can be rotated about a vertical yaw axis to change its yaw angle.

[0025] The wind turbine 1 may be included in a collection of other wind turbines belonging to a wind power plant (also called a wind farm or a wind farm) which serves as an electricity generation plant connected to an electrical grid via transmission lines. An electrical grid typically consists of a network of generating stations, transmission circuits and substations which are connected by a network of transmission lines to transmit electricity to loads in the form of end users and other customers of an electrical company.

[0026] Figure 2An embodiment of a control system 200 and elements of a wind turbine 1 are schematically illustrated. The rotors 4, 5 are mechanically connected to a generator 7 via a gearbox 9. The electricity generated by the generator 7 is injected into a grid 204 via an electrical converter 205. The generator 7 and the converter 205 may be based on a full-size converter (FSC) architecture or a doubly-fed induction generator (DFIG) architecture, but other types may also be used. 2022P00008WOCN(KIHHA)

[0027] The control system 200 includes a plurality of elements, including at least one main controller 220 with a processor and a memory, so that the processor can perform computing tasks based on instructions stored in the memory. Typically, the main controller 220 ensures that the wind turbine generates the requested power output level in operation. This is achieved by adjusting the pitch angle of the blades and / or the power extraction of the converter 205. To this end, the control system 200 includes: a pitch system, which includes a pitch controller 207 using a pitch reference signal 208; and a power system, which includes a power controller 209 using a power reference signal 206. The rotor blades 5 can be pitched by a pitch mechanism. The rotor includes a separate pitch system that can individually pitch the rotor blades 5, and can include a common pitch system that simultaneously adjusts all pitch angles of all rotor blades. The control system 200 or elements of the control system 200 can be placed in a power plant controller (not shown) so that the turbine can operate based on externally provided instructions.

[0028] The wind turbine 1 comprises a control network and a monitoring network, which are Figure 3 and Figure 4 The control network may be configured to control the wind turbine 1; and the monitoring network may be configured to monitor the wind turbine.

[0029] Figure 4 An example of a control network is shown at the top of . The control network includes one or more first control network nodes 12 in the rotor (e.g., in the hub 4) and one or more second control network nodes 13 in the nacelle 3. The control network nodes 12, 13 are connected by a first network. The first network has a fiber optic backbone that includes an optical fiber 11a in the hub, an optical fiber 11b in the nacelle, and a linking optical fiber 8 extending between the nacelle 3 and the hub 4. The linking optical fiber 8 can be a multimode optical fiber or a single-mode optical fiber. The first network also includes various electrical communication lines, which include transmission lines 40a, 40b; receiving lines 41a, 41b; and connector lines 42a, 42b.

[0030] The control network in the rotor includes a first optical transceiver / duplexer 51a, a first control network switch 15a, and one or more first control network nodes 12 connected to the first control network switch 15a. In this example, only a single control network node 12 is shown in the rotor, but in other embodiments, other control network nodes in the rotor can be connected to the first control network switch 15a.

[0031] The first control network node (or each first control network node) in the rotor may include a distributed control network node (DCN) 12 with control elements configured to control the wind turbine based on control data from the master controller 220 or any other turbine control system or element. The first network 11a, 11b, 8, 40b, 41a may be configured to transmit the control data to the DCN 12 in the rotor. In this example, the control data is transmitted via line 2022P00008WOCN(KIHHA)

[0032] The path 21 is received from the main controller 220 to the second control network switch 15b in the cabin.

[0033] In the example of a DCN 12, the control element may be a blade pitch controller 16 which adjusts the pitch of the blades 5 based on the control data.

[0034] One or more of the first control network nodes in the rotor may transmit as well as receive information. For example, one or more of the DCNs 12 may be configured to generate configuration data that is transmitted to the master controller 220 or another element of the wind turbine via the first network 11a, 11b, 8, 40a, 41b.

[0035] In this example, the first control network nodes in the rotor are located in the hub 4 , but alternatively one or more of the first control network nodes may be located in another part of the rotor, such as the blades 5 .

[0036] The control network in the nacelle includes a second optical transceiver / duplexer 51b, a second control network switch 15b, and one or more second control network nodes 13, 14 connected to the second control network switch 15b. In this example, two second control network nodes 13, 14 are shown in the nacelle, but in other embodiments, there may be only a single second control network node in the nacelle, or there may be more than two second control network nodes.

[0037] The second control network node (or each second control network node) in the nacelle may comprise a distributed control network node (DCN) 13, 14 with a control element configured to control the wind turbine based on the control data. The optical fiber 11b of the first network in the nacelle may be configured to transmit the control data to the DCN 13, 14 in the nacelle.

[0038] In the example of the DCN 13 , the control element may be a converter fan controller 18 which adjusts the power of a converter fan (which cools the converter 205 ) based on the control data.

[0039] In the example of the DCN 14 , the control element may be a gearbox lubrication controller 20 that controls the lubrication of the gearbox 9 .

[0040] One or more of the second control network nodes in the nacelle may transmit as well as receive information. For example, one or more of the DCNs 13, 14 may be configured to generate configuration data that is transmitted to the master controller 220 or another element of the wind turbine via the second control network switch 15b.

[0041] In this example, each DCN 12, 13, 14 of the control network may optionally include a control element configured to control a wind turbine, but other control network nodes may be provided as part of the control network, which perform different functions depending on their location.

[0042] "Network node" means a node that is part of a control network but does not necessarily perform control functions directly.

[0043] Figure 4 An example of a monitoring network is shown at the bottom of FIG. The monitoring network includes one or more first monitoring network nodes 36 in the rotor 4 and one or more second monitoring network nodes 37 in the nacelle 3. The monitoring network nodes of the monitoring network are connected via a second network. The second network has a fiber optic backbone including an optical fiber 31a in the hub, an optical fiber 31b in the nacelle, and a linking optical fiber 8 shared by the first network and the second network. The second network also includes various electrical communication lines, including transmission lines 42a, 42b; receiving lines 43a, 43b; and sensor connector lines 44a, 44b.

[0044] The monitoring network in the rotor includes a first optical transceiver / duplexer 52a, a first plant switch 32a, and one or more first monitoring network nodes 36 connected to the first plant switch 32a. In this example, only a single first monitoring network node 36 is shown in the rotor, but in other embodiments, other monitoring network nodes in the rotor can be connected to the first plant switch 32a.

[0045] Each first monitoring network node in the hub may include a monitoring element (such as a sensor) configured to monitor the wind turbine and generate monitoring data. The second network 31a, 31b, 8, 44a, 42a, 43b may be configured to receive monitoring data from the first monitoring network node 36 in the rotor and transmit the monitoring data to a plant substation 33 away from the wind turbine 1. The monitoring data may be output via a second plant switch 32b in the nacelle and a third plant switch 32c at the bottom of the tower 2 ( Figure 3 A third factory switch 32c and a factory substation 33 are shown in FIG.

[0046] In this example, the first monitoring network node in the rotor may be a blade vibration sensor 36 in one of the blades 5 , which measures vibrations of one or more of the blades 5 .

[0047] In this example, the first monitoring network node 36 is located in the blade 5 , but alternatively one or more of the first monitoring network nodes in the rotor may be located in another part of the rotor, such as the hub 4 .

[0048] One or more of the first monitoring network nodes in the rotor may receive as well as transmit information.For example, the second network may be configured to transmit monitoring network data (such as configuration data or command data) from the master controller 220 to the first monitoring network nodes 36 in the rotor.

[0049] The monitoring network in the nacelle includes a second optical transceiver / duplexer 52b, a second plant switch 32b, and one or more second monitoring network nodes 37 connected to the second plant switch 32b. In this example, only a single second monitoring network node 37 is shown in the nacelle, but in other embodiments, other monitoring network nodes in the nacelle can be connected to the second plant switch 32b.

[0050] Each second monitoring network node 37 in the nacelle may include a monitoring element (such as a sensor), 2022P00008WOCN (KIHHA)

[0051] The monitoring element is configured to monitor the wind turbine and generate monitoring data. The second plant switch 32b may be configured to receive the monitoring data from the first monitoring network node 37 in the nacelle and to generate monitoring data via Figure 3The third plant switch 32 c shown transmits the monitoring data to the plant substation 33 .

[0052] In this example, the second monitoring network node in the nacelle may be a gearbox vibration sensor 37 measuring vibrations of the gearbox 9 .

[0053] Other monitoring elements in the nacelle may measure the rotation rate, temperature, oil level and / or power output of the generator 7 .

[0054] In this example, the monitoring network does not perform any control functions.

[0055] The second monitoring network node 37 in the nacelle can receive as well as transmit information. For example, the second network can be configured to transmit monitoring network data (such as configuration data or command data) from the main controller 220 to the second monitoring network node 37 in the nacelle.

[0056] In this example, each monitoring network node 36, 37 may optionally include a monitoring element configured to monitor a wind turbine, but other monitoring network nodes may be provided as part of a monitoring network, which perform different functions depending on their location. Therefore, the term "monitoring network node" refers to a node that is part of a monitoring network but does not necessarily directly perform a monitoring function.

[0057] Optionally, the monitoring network is functionally separated from the control network, thereby preventing communication between the networks to comply with cyber security standards. This prevents a cyber attack on the monitoring network from gaining access to the control network through the monitoring network, thereby compromising the safety control of the wind turbine.

[0058] Since the rotors 4, 5 are rotatably mounted to the nacelle 3, the linking optical fiber 8 requires an optical fiber rotary joint. One way to keep the monitoring network functionally separate from the control network is to have each network have its own dedicated linking optical fiber. One problem with this alternative solution is that it requires a second linking optical fiber and a multi-channel optical rotary joint.

[0059] exist Figure 3 and Figure 4 In this case, a single link optical fiber 8 between the nacelle and the rotor is shared by the first network and the second network.

[0060] A first wavelength division multiplexer / demultiplexer 50a is provided in the rotor; a second wavelength division multiplexer / demultiplexer 50b is provided in the nacelle. The multiplexers / demultiplexers 50a and 50b are respectively connected to the link optical fiber 8 and the optical transceivers / duplexers 51a, 51b, 52a, and 52b (they are connected in Figure 5 (detailed display in ).

[0061] The control network and the monitoring network each comprise a respective transceiver / duplexer 51a, 52a in the rotor and a respective transceiver / duplexer 51b, 52b in the nacelle.

[0062] 2022P00008WOCN(KIHHA)

[0063] Each transceiver / duplexer includes: a duplexer 60a, 60b, 61a, 61b; a transmitter 62a, 62b, 63a, 63b (such as a laser) and a receiver 64a, 64b, 65a, 65b (such as an optical receiver).

[0064] The transmitters 62a, 62b, 63a, 63b are each configured to generate light of a corresponding wavelength and feed it through one of the multiplexers / demultiplexers 50a, 50b to the linking optical fiber 8. The light is either nacelle-limited light (propagating from the rotor to the nacelle) or rotor-limited light (propagating from the nacelle to the rotor).

[0065] Each transmitter may convert a corresponding electrical communication signal into a corresponding optical communication signal, as described below.

[0066] More specifically: the transmitter 62a of the control network in the rotor can be configured to receive an electrical transmission signal from the control network on the transmission line 40a, use the transmission signal to generate a cabin-limited light with a wavelength of λ2, and feed it to the first wavelength division multiplexer / demultiplexer 50a via the duplexer 60a.

[0067] The transmitter 63a of the monitoring network in the rotor may be configured to receive the electrical transmission signal from the monitoring network on the transmission line 42a, use the transmission signal to generate nacelle-limited light at wavelength λ4, and feed it to the first wavelength division multiplexer / demultiplexer 50a via the duplexer 61a.

[0068] The transmitter 62b of the control network in the nacelle may be configured to receive an electrical transmission signal from the control network on the transmission line 40b, use the transmission signal to generate rotor limiting light of wavelength λ1, and feed it to the second wavelength division multiplexer / demultiplexer 50b via the duplexer 60b.

[0069] The transmitter 63b of the monitoring network in the cabin may be configured to receive an electrical transmission signal from the monitoring network on the transmission line 42b, use the transmission signal to generate cabin-limited light of wavelength λ3, and feed it to the second wavelength division multiplexer / demultiplexer 50b via the duplexer 61b.

[0070] The receivers 64a, 64b, 65a, 65b may each be configured to receive light from the linking optical fiber 8 and convert it into an electrical signal.

[0071] Each receiver may convert a corresponding optical communication signal into a corresponding electrical communication signal, as described below.

[0072] More specifically: the receiver 64a of the control network in the rotor can be configured to receive the rotor-limited light of wavelength λ1 from the first wavelength division multiplexer / demultiplexer 50a and convert it into an electrical signal and output the electrical signal on the receiving line 41a.

[0073] The receiver 65a of the monitoring network in the rotor can be configured to receive the first wavelength division multiplexer 2022P00008WOCN (KIHHA)

[0074] The rotor of the multiplexer / demultiplexer 50a limits the light of wavelength λ3 and converts it into an electrical signal, and outputs the electrical signal on the receiving line 43a.

[0075] The receiver 64b of the control network in the nacelle may be configured to receive the nacelle-limited light of wavelength λ2 from the second wavelength division multiplexer / demultiplexer 50b and convert it into an electrical signal and output the electrical signal on the receiving line 41b.

[0076] The receiver 65b of the monitoring network in the cabin may be configured to receive the cabin-limited light of wavelength λ4 from the second wavelength division multiplexer / demultiplexer 50b and convert it into an electrical signal and output the electrical signal on the receiving line 43b.

[0077] The first wavelength division multiplexer / demultiplexer 50a may be configured to receive the nacelle-limited light from the control network and the monitoring network in the rotor and multiplex the nacelle-limited light onto the link optical fiber 8. As described above, the wavelength of the nacelle-limited light from the control network is λ2, and the wavelength of the nacelle-limited light from the monitoring network is λ4.

[0078] The second wavelength division multiplexer / demultiplexer 50b may be configured to receive rotor limiting light from the control network and the monitoring network in the nacelle and multiplex the rotor limiting light onto the link optical fiber 8. As described above, the wavelength of the rotor limiting light from the control network is λ1, and the wavelength of the rotor limiting light from the monitoring network is λ3.

[0079] The first wavelength division multiplexer / demultiplexer 50a is also configured to demultiplex the rotor-limited light from the linking optical fiber 8 and route it to the control network or the monitoring network based on the wavelength of the rotor-limited light from the linking optical fiber 8. The rotor-limited light with a wavelength of λ1 is routed to the control network in the rotor through the transceiver / duplexer 51a, and the rotor-limited light with a wavelength of λ3 is routed to the monitoring network in the rotor through the transceiver / duplexer 52a.

[0080] The second wavelength division multiplexer / demultiplexer 50b is also configured to demultiplex the cabin-limited light from the linking optical fiber 8 and route it to the control network or the monitoring network based on the wavelength of the cabin-limited light from the linking optical fiber 8. The cabin-limited light with a wavelength of λ2 is routed to the control network in the cabin through the transceiver / duplexer 51b, and the cabin-limited light with a wavelength of λ4 is routed to the monitoring network in the cabin through the transceiver / duplexer 52b.

[0081] Each duplexer 60a, 60b, 61a, 61b may include a passive element such as an angled (tilted) filter that reflects light of one wavelength but transmits light of another wavelength. Thus, for example, the duplexer 60a may reflect rotor-limited light of wavelength λ1 but transmit nacelle-limited light of wavelength λ2.

[0082] 2022P00008WOCN(KIHHA)

[0083] Alternatively, each wavelength division multiplexer / demultiplexer 50a, 50b may use similar passive components, such as angled filters, to perform its multiplexing and / or demultiplexing functions.

[0084] The use of passive components, such as angled filters, is advantageous and can be achieved through the wavelength division multiplexing aspect of the design.

[0085] Although the invention has been described above with reference to one or more preferred embodiments, it will be appreciated that various changes or modifications may be made without departing from the scope of the invention as defined in the appended claims.

Claims

1. A wind turbine comprising: cabin; a rotor rotatably mounted to the nacelle, the rotor comprising a hub and blades extending from the hub; a control network comprising control network nodes connected via a first network, the control network nodes comprising one or more first control network nodes in the rotor and one or more second control network nodes in the nacelle; a monitoring network comprising monitoring network nodes connected via a second network, the monitoring network nodes comprising one or more first monitoring network nodes in the rotor and one or more second monitoring network nodes in the nacelle; an optical fiber shared by the first network and the second network and extending between the nacelle and the rotor; a first wavelength division multiplexer / demultiplexer in the rotor; as well as A second wavelength division multiplexer / demultiplexer in the nacelle, wherein: The first wavelength division multiplexer / demultiplexer is configured to receive cabin-limited light and multiplex the cabin-limited light onto the optical fiber; The first wavelength division multiplexer / demultiplexer is configured to demultiplex the rotor-limited light from the optical fiber and route it to the control network or the monitoring network based on the wavelength of the rotor-limited light; the second wavelength division multiplexer / demultiplexer being configured to demultiplex the cabin-limited light from the optical fiber and route it to the control network or the monitoring network based on the wavelength of the cabin-limited light; and The second wavelength division multiplexer / demultiplexer is configured to multiplex the rotor-limited light onto the optical fiber.

2. The wind turbine according to claim 1, wherein: At least one of the first monitoring network nodes and at least one of the second monitoring network nodes comprises a monitoring element configured to monitor the wind turbine and generate monitoring data.

3. The wind turbine according to claim 2, wherein: The second network is configured to receive the monitoring data and transmit the monitoring data to a substation remote from the wind turbine.

4. A wind turbine according to any preceding claim, wherein: The second network is configured to transmit monitoring network data to the monitoring network node.

5. The wind turbine according to claim 4, wherein: The monitoring network data includes configuration data or command data.

6. A wind turbine according to any preceding claim, wherein: At least one of the first control network nodes and at least one of the second control network nodes comprises a control element configured to control the wind turbine based on control data, and the first optical fiber network is configured to transmit the control data to the control element.

7. A wind turbine according to any preceding claim, wherein: The first wavelength division multiplexer / demultiplexer and / or the second wavelength division multiplexer / demultiplexer are configured to operate passively.

8. A wind turbine according to any preceding claim, wherein: The optical fiber is a multimode optical fiber.

9. A wind turbine according to any preceding claim, wherein: The first wavelength division multiplexer / demultiplexer is located in the hub.

10. A wind turbine according to any preceding claim, wherein: The control network and the monitoring network each include a corresponding transmitter in the rotor, and the transmitter in the rotor is configured to generate a nacelle-limited light of a corresponding wavelength and feed it to the first wavelength division multiplexer / demultiplexer.

11. A wind turbine according to any preceding claim, wherein: The control network and the monitoring network each include a corresponding transmitter in the nacelle, and the transmitter in the nacelle is configured to generate rotor-limited light of a corresponding wavelength and feed it to the second wavelength division multiplexer / demultiplexer.

12. A wind turbine according to any preceding claim, wherein: The control network and the monitoring network each include a corresponding receiver in the rotor, and the receivers in the rotor are each configured to receive rotor-limited light of a corresponding wavelength from the first wavelength division multiplexer / demultiplexer and convert the rotor-limited light into an electrical signal.

13. A wind turbine according to any preceding claim, wherein: The control network and the monitoring network each include a corresponding receiver in the nacelle, and the receivers in the nacelle are each configured to receive nacelle-limited light of a corresponding wavelength from the second wavelength division multiplexer / demultiplexer and convert the nacelle-limited light into an electrical signal.

14. A method of processing communication signals in a wind turbine network, the wind turbine comprising: cabin; a rotor rotatably mounted to the nacelle, the rotor comprising a hub and blades extending from the hub; a control network comprising control network nodes connected via a first network, the control network nodes comprising one or more first control network nodes in the rotor and one or more second control network nodes in the nacelle; a monitoring network comprising monitoring network nodes connected via a second network, the monitoring network nodes comprising one or more first monitoring network nodes in the rotor and one or more second monitoring network nodes in the nacelle; as well as an optical fiber shared by the first network and the second network and extending between the nacelle and the rotor, the method comprising: receiving nacelle-limited light and multiplexing the nacelle-limited light onto the optical fiber; demultiplexing rotor-limiting light from the optical fiber and routing it to the control network or the monitoring network based on the wavelength of the rotor-limiting light; demultiplexing cabin-limiting light from the optical fiber and routing it to the control network or the monitoring network based on the wavelength of the cabin-limiting light; and multiplexing the rotor-limiting light onto the optical fiber.

Images