CN220383233U

CN220383233U - Communication system of offshore wind farm

Info

Publication number: CN220383233U
Application number: CN202321510831.4U
Authority: CN
Inventors: 谭任深; 戚永乐; 余建忠; 王雨; 彭雅妮; 徐穗宜; 周冰; 李行义; 何登富
Original assignee: China Energy Engineering Group Guangdong Electric Power Design Institute Co Ltd
Current assignee: China Energy Engineering Group Guangdong Electric Power Design Institute Co Ltd
Priority date: 2023-06-14
Filing date: 2023-06-14
Publication date: 2024-01-23
Anticipated expiration: 2033-06-14

Abstract

The application relates to a communication system of an offshore wind farm, which comprises a communication base station, a control unit and a control unit, wherein the communication base station is arranged on a boosting platform of the offshore wind farm and is used for providing radio frequency signals; the first repeater is arranged on the boosting platform and is connected with the communication base station; the second repeater is arranged in a tower barrel of the wind turbine generator in the offshore wind power plant and is connected with the first repeater; and the passive distribution system is arranged in the tower barrel of the wind turbine generator and is connected with the second repeater. By adopting the method, the second repeater positioned in the wind turbine tower can receive the communication signal sent by the communication base station through the submarine optical cable, and the communication signal is input into the indoor branch antenna in the wind turbine tower through the passive distribution system consisting of the power divider, the coupler and the like, and is emitted out through the indoor branch antenna, and the fully-covered wireless communication hot spot is arranged in the wind turbine tower of the offshore wind power plant, so that the real-time communication of operation and maintenance personnel can be supported, the real-time monitoring of the equipment state can be realized, and the operation and maintenance work efficiency can be greatly improved.

Description

Communication system of offshore wind farm

Technical Field

The application relates to the technical field of wind power generation, in particular to a communication system of an offshore wind farm.

Background

With the vigorous development of wind and electric energy sources, the offshore wind farm becomes a key ring of the transformation and sustainable development of the thrust energy sources. The offshore wind farm can utilize the geographic advantage and the open space with stronger wind power on the ocean to generate more stable and reliable wind energy, and compared with the land wind farm, the offshore wind farm can obtain higher average wind speed and fewer barriers, thereby improving the power generation efficiency and capacity factor.

In the current offshore wind farm, an operator network is generally difficult to cover, and operation staff of the offshore wind farm can hardly use a mobile terminal to carry out instant messaging on an offshore navigation platform or a boosting platform and a wind turbine generator. Especially when carrying out operation maintenance work in wind turbine tower section of thick bamboo, because wind turbine tower section of thick bamboo is equivalent to natural signal shielding layer, lead to operation maintenance personnel unable and external effectual connection in wind turbine tower section of thick bamboo, the problem can't report in time, engineering construction inefficiency such as operation maintenance.

Disclosure of Invention

In view of the above, it is necessary to provide an offshore wind farm communication system capable of realizing real-time communication in an offshore wind farm and improving engineering construction efficiency such as operation, maintenance and repair.

The application provides an offshore wind farm communication system, the system comprising:

the communication base station is arranged on a boosting platform of the wind power plant and is used for providing radio frequency signals;

the first repeater is arranged on the boosting platform and is connected with the communication base station;

the second repeater is arranged in the tower barrel of the wind turbine generator in the wind power plant and is connected with the first repeater;

the passive distribution device is arranged in the tower barrel of the wind turbine generator and is connected with the second repeater.

In one embodiment, the passive distribution device comprises a coupler, a power divider and a room division antenna, one end of the coupler is connected with the second repeater, the other end of the coupler is connected with one end of the power divider, and the other end of the power divider is connected with the room division antenna.

In one embodiment, the passive distribution device further comprises a feeder line laid along the wiring rack in the tower of the wind turbine.

In one embodiment, feeder lines are used for connection between the second repeater and the coupler, between the coupler and the power divider, and between the power divider and the antenna.

In one embodiment, the communication base station includes a baseband processing unit including at least one of a dual mode baseband processing unit and a multi-mode baseband processing unit.

In one embodiment, the system further comprises an outdoor antenna disposed on the booster stage.

In one embodiment, the communication base station further includes an outdoor macro station remote unit, one end of the outdoor macro station remote unit is connected with the baseband processing unit through an optical fiber, and the other end of the outdoor macro station remote unit is connected with the first repeater and the outdoor antenna through feeder lines respectively.

In one embodiment, the outdoor macro-station remote units comprise at least one of dual-mode outdoor macro-station remote units and multi-mode outdoor macro-station remote units.

In one embodiment, the first repeater includes a near end machine.

In one embodiment, the second repeater includes a remote machine connected to the near-end machine by a fiber-optic cable at the sea floor of the wind farm.

The communication system of the offshore wind farm comprises a communication base station, a power transmission system and a power transmission system, wherein the communication base station is arranged on a boosting platform of the offshore wind farm and is used for providing radio frequency signals; the first repeater is arranged on the boosting platform and is connected with the communication base station; the second repeater is arranged in a tower barrel of the wind turbine generator in the offshore wind power plant and is connected with the first repeater; and the passive distribution system is arranged in the tower barrel of the wind turbine generator and is connected with the second repeater. The communication base station is arranged on the boosting platform and is used for providing radio frequency signals, the first repeater is connected with the communication base station through a feeder line and converts the radio frequency signals into digital signals, the digital signals are connected with the second repeater through a submarine optical cable between the boosting platform and the wind turbine tower, and the second repeater recovers the digital signals into radio frequency signals and provides wireless coverage in the wind turbine tower through a passive distribution system. The second repeater positioned in the wind turbine tower can receive communication signals sent by the communication base station through the submarine optical cable, the communication signals are input to the indoor branch antenna of the wind turbine tower through the passive distribution system formed by the power divider, the coupler and the like, the communication signals are transmitted out through the indoor branch antenna, signals transmitted by the user terminal in the wind turbine tower are absorbed by the indoor branch antenna, are input to the second repeater through the coupler and the power divider, and are transmitted to the first repeater through the submarine optical cable by the second repeater, and are transmitted to the communication base station through the first repeater. Through set up the wireless communication hotspot of full cover in the wind turbine generator system tower section of thick bamboo of offshore wind power plant, can make maintainer use mobile communication or video equipment to contact with land centralized control center in any place wherein, realize long-range visual maintenance, can realize engineering implementation each side's personnel's real-time communication during setting up, information interconnection improves engineering construction's efficiency, guarantee personnel and equipment safety. During operation and maintenance, the coverage of the offshore wireless network can support real-time communication of operation and maintenance personnel, and can monitor the state of equipment in real time, so that the operation and maintenance work efficiency is greatly improved.

Drawings

FIG. 1 is a block diagram of a communication system of an offshore wind farm in one embodiment;

FIG. 2 is a block diagram of a communication system of an offshore wind farm in another embodiment;

in the figure: 100-communication base station, 102-5G equipment, 104-baseband processing unit, 106-outdoor macro station remote unit, 200-first repeater, 202-near end machine, 300-third repeater, 302-remote machine, 400-passive distribution system, 402-coupler, 404-power divider, 406-indoor antenna.

Detailed Description

In order to make the above objects, features and advantages of the present application more comprehensible, embodiments accompanied with figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. This application is, however, susceptible of embodiment in many other forms than those described herein and similar modifications can be made by those skilled in the art without departing from the spirit of the application, and therefore the application is not to be limited to the specific embodiments disclosed below.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present application, the meaning of "plurality" is at least two, such as two, three, etc., unless explicitly defined otherwise.

In this application, unless specifically stated and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art as the case may be.

In this application, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.

It will be understood that when an element is referred to as being "fixed" or "disposed" on another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like are used herein for illustrative purposes only and are not meant to be the only embodiment.

Referring to fig. 1, fig. 1 shows a schematic structural diagram of an offshore wind farm communication system according to an embodiment of the present application, and the offshore wind farm communication system provided in an embodiment of the present application includes a communication base station 100, a first repeater 200 connected to the communication base station 100, a second repeater 300 connected to the first repeater 200, and a passive distribution system 400 connected to the second repeater 300.

Wind power is actively developed worldwide in recent years, and the installed capacity of the wind power is increasingly increased. With the development of landed and offshore wind farms, there is an increasing demand for wireless communication systems for wind farms, in particular offshore wind farms. At present, an operator network is not covered in a wind power plant, operation staff of the wind power plant can not easily use a mobile terminal such as a mobile phone to carry out instant messaging on an offshore navigation platform or a boosting platform and a wind turbine generator, and the on-site situation can not be transmitted to the land and an operation background in time, so that great inconvenience is caused to operation and maintenance.

The operation and maintenance work in the wind turbine generator is aimed at, and as the wind turbine generator tower is equivalent to a natural signal shielding layer, operation and maintenance personnel cannot effectively communicate with the outside in the wind turbine generator tower, problems cannot be timely reported, the state of the operation and maintenance personnel is difficult to know by a land centralized control center and background operation and maintenance personnel, and engineering construction efficiency of operation and maintenance is low.

The embodiment of the application aims to provide a wireless communication system used in a marine wind power plant, in particular in a wind turbine tower of the marine wind power plant, and network coverage of the marine wind power plant is realized through connection and installation of a communication base station 100, a first repeater 200, a second repeater 300 and a passive distribution system 400.

As shown in fig. 1, a communication base station 100 of the communication system of the offshore wind farm in this embodiment is disposed on a booster platform of the offshore wind farm, and is configured to provide a radio frequency signal.

The communication base station 100 in the embodiment of the present application refers to an offshore communication base station for an offshore wind farm, which provides communication services for targets such as ocean platforms, wind turbines, and the like, and is mainly used for providing network coverage and communication services in an offshore environment far from land. The communication base station 100 has main functions including receiving and transmitting communication signals, managing and controlling the state of a communication system, and providing services such as data transmission and voice communication to users.

The communication base station 100 may implement a communication service using satellite communication technology or a dedicated offshore mobile communication base station. The communication base station 100 may be connected to land by satellite, optical cable, microwave communication, radio wave, etc. to achieve information transmission, and the specific connection manner depends on factors such as the location, distance, and environment of the communication base station and the land communication facility.

In one implementation manner, in order to ensure stability and reliability of communication, in consideration of complexity of an offshore environment and specificity of communication equipment, in this embodiment, a special offshore mobile communication base station is adopted to implement communication service, the communication base station 100 is connected with a terrestrial carrier network through a shore-returning submarine optical cable, the communication base station 100 includes a Baseband processing Unit (BBU) and an outdoor macro station remote Unit (Remote Radio Unit, RRU), the outdoor macro station remote Unit is adopted as a donor base station source of an offshore wind farm, the Baseband processing Unit is adopted to transmit signals to the outdoor macro station remote Unit through an optical fiber, then a radio frequency port of the outdoor macro station remote Unit is connected with the first repeater 200 through a feeder, and the first repeater 200 transmits digital signals to the second repeater 300 through a submarine optical cable in the wind farm.

As shown in fig. 1, a first repeater 200 of the communication system of the offshore wind farm in this embodiment is disposed on a booster platform and connected to a communication base station 100, and a second repeater 300 is disposed in a tower of a wind turbine generator of the offshore wind farm and connected to the first repeater.

The first repeater 200 and the second repeater 300 are matched devices of a communication system, the first repeater 200 and the second repeater 300 comprise a radio frequency unit (RF unit) and an optical unit, after being coupled out from the communication base station 100, the radio frequency signals enter the first repeater 200, the radio frequency signals are converted into digital signals through conversion, the digital signals are input into a submarine optical cable between a boosting platform and a wind turbine tower in a wind farm from the first repeater 200, the digital signals are converted into radio frequency signals again through the submarine optical cable to the second repeater 300, the signals are covered into a range of receiving devices through the passive distribution system 400, and the wireless coverage is provided in the wind turbine tower through the passive distribution system.

In one implementation, the first repeater 200 may be a near-end machine, and the second repeater 300 may be a far-end machine, where the near-end machine and the far-end machine form a fiber repeater.

The near-end machine integrates the functions of radio frequency signal receiving and processing, emergency signal switching, centralized monitoring, electro-optical conversion, and the like, is positioned on the boosting platform and is close to the communication base station 100, and can be coupled with base station signals.

The remote terminal is used for receiving the digital signals transmitted by the front-end near-end machine, performing photoelectric conversion, radio frequency linear amplification, remote monitoring and the like, and is positioned at the user side in the tower of the fan unit.

In general, the optical fiber repeater is a repeater for transmitting signals by means of an optical fiber, and uses the characteristics of small optical fiber transmission loss, convenient wiring and suitability for long-distance transmission, and is input from a near-end machine to the optical fiber, and transmitted to an optical far-end machine through the optical fiber. In the embodiment of the application, the digital signals are transmitted between the near-end machine and the far-end machine through the submarine optical cable between the boosting platform and the wind turbine tower, so that the situation that signal attenuation cannot be accessed due to long-distance feeder line or optical fiber transmission is avoided, the wireless radio frequency signals on the boosting platform are transmitted into the wind turbine tower through the first repeater 200, the radio frequency signals are recovered by the second repeater 300 in the wind turbine tower, and the signals are uniformly distributed in the tower through the passive distribution system 400.

As shown in fig. 1, a passive distribution system 400 of the communication system of the offshore wind farm in this embodiment is disposed in a tower of the wind turbine, and is connected to the second repeater 300.

The passive distribution system 400 distributes, attenuates and combines signals by using passive devices, thereby enabling signals to cover a wider range within the wind turbine tower.

Because the wind turbine tower is of a metal structure, external wireless signals cannot penetrate through the wind turbine tower, wireless small stations are required to be deployed in the wind turbine tower, access capability is provided, and video, voice communication and other data acquisition communication are returned. A user accesses to the wireless communication system through a 4G or 5G mobile terminal, a 4G or 5G wireless air interface is adopted between the terminal and the optical fiber repeater, so that the user can conveniently patrol and examine the inside of a wind turbine generator tower, the wind turbine generator is a rotating part, a wire cable or an optical fiber is laid, and the wireless repeater can flexibly access the wind turbine generator.

The passive distribution system branches through passive devices such as couplers, power splitters, feeder lines and antennas, and distributes signals to each pair of indoor distribution antennas which are arranged in various areas in the wind turbine tower in a scattered mode through the feeder lines, so that wireless signals are distributed in the wind turbine tower more uniformly, and good wireless coverage is provided. The passive distribution system in the tower of the wind turbine generator can lay feeder lines along the wiring frame, couplers are arranged at deployment points of the indoor branch antennas and are coupled to form radio frequency signal branches, the indoor branch antennas transmit radio frequency signals, the tail ends close to the top of the tower are separated by power dividers to form radio frequency signals, and the indoor branch antennas transmit radio frequency signals.

In one embodiment, as shown in FIG. 2, there is provided an offshore wind farm communication system comprising:

the 5G device 102, the baseband processing unit 104, and the outdoor macro remote unit 106 of the 4G or 5G communication base station are deployed on the booster platform, the baseband processing unit 104 is the BBU in fig. 2, and the outdoor macro remote unit 106 is the RRU in fig. 2. The 5G device 102 is connected to a land-based carrier network through a shore-back submarine cable, and the baseband processing unit 104 transmits signals to the outdoor macro-station remote unit 106 through optical fibers, where the outdoor macro-station remote unit 106 serves as a donor base station source for the wind farm and provides radio frequency signals.

The rf port of the outdoor macro station remote unit 106 is connected to the near end unit 202 via a feeder, and the near end unit 202 converts the wireless rf signal to a digital signal. The near-end machine 202 is connected with the far-end machine 302 in the wind turbine tower, the near-end machine 202 transmits digital signals to the far-end machine 302 through a submarine optical cable, the far-end machine 302 restores the digital signals to radio frequency signals, and wireless coverage is provided in the wind turbine tower through the passive distribution system 400.

For each wind turbine tower, the remote machine 302 and the passive distribution system 400 are configured in the tower, and the configuration and connection relationship of the communication system when the first fan tower and the second fan tower exist are exemplarily shown in fig. 2.

As shown in fig. 2, the passive distribution system 400 includes passive devices such as a coupler 402, a power divider 404, and a room antenna 406, where one end of the coupler 402 is connected to the remote unit 302, the other end of the coupler 402 is connected to one end of the power divider 404, and the other end of the power divider 404 is connected to the room antenna 406.

Passive distribution system 400 also includes feed lines running along the wiring rack within the wind turbine tower, where feed lines are used to connect power divider 404 to coupler 402, coupler 402 to power divider 404, and power divider 404 to indoor antenna 406.

In this embodiment, the wireless communication system of the offshore wind turbine is formed by connecting and installing the baseband processing unit 104, the outdoor macro-station remote unit 106, the near-end machine 202, the far-end machine 302, the coupler 402, the power divider 404, the indoor antenna 406 and other devices, so as to realize the full coverage of the wireless network in the tower of the wind turbine. Through setting up the wireless communication hotspot of full coverage at offshore wind turbine generator system, can make maintainer all can use mobile communication or video equipment to contact with land centralized control center in any place wherein, realize long-range visual maintenance. The real-time communication of personnel of each engineering implementation party can be realized during construction, information is interconnected, the efficiency of engineering construction is improved, and the safety of personnel and equipment is ensured. During operation and maintenance, the coverage of the offshore wireless network can support real-time communication of operation and maintenance personnel, and can monitor the state of equipment in real time, so that the operation and maintenance work efficiency is greatly improved. In addition, the wireless signals are more uniformly distributed in the tower through the passive distribution system, and good wireless coverage is provided.

In one embodiment, the near-end machine 202 is connected to the far-end machine 302 within the wind turbine tower via a subsea cable between the booster stage and the wind turbine tower.

According to the embodiment, the near-end machine 302 deployed in the boosting platform and the far-end machine 302 deployed in the wind turbine tower are connected through the submarine optical cable between the boosting platform and the wind turbine tower, so that the anti-interference capability can be enhanced, and the signal transmission quality can be optimized.

In one embodiment, the communication base station 100 includes a baseband processing unit 104 that may be at least one of a dual mode baseband processing unit and a multi-mode baseband processing unit.

The baseband processing unit 104 is mainly responsible for processing and modulating the digital baseband signal, and transmitting the digital baseband signal to the rf module for rf processing. In the LTE system, the baseband processing unit 104 may be generally connected to a plurality of outdoor macro-station remote units, and implement data exchange and control between the base station and the core network through an optical fiber or gigabit ethernet interface. The functions of the baseband processing unit 104 include digital signal processing, channel coding, modulation and demodulation, power amplification, radio frequency signal transmission, etc., and may enable support of multiple radio access technologies, as well as a combination of multiple network topologies. In addition, the baseband processing unit 104 may also implement a centralized or distributed deployment manner to meet different requirements.

The baseband processing unit 104 may be divided into 4G and 5G devices, where the 4G baseband processing unit is mainly used in an LTE network, and is capable of supporting an outdoor macro remote unit 106 based on CPRI and OBSAI interfaces, transmitting baseband signals to the outdoor macro remote unit 106 through an optical fiber, and then performing radio frequency transmission by the outdoor macro remote unit 106. The 5G baseband processing unit is oriented to a 5G new generation mobile communication network, and more performance and characteristic support, such as millisecond delay, high speed, large bandwidth and the like, are added compared with the 4G baseband processing unit. The baseband processing unit 104 of the embodiment of the present application may employ dual mode devices supporting both 4G and 5G, providing better network performance.

The arrangement of the baseband processing unit 104 in this embodiment can enable the offshore wind farm communication system to have better network performance.

In one embodiment, the communication base station 100 includes an outdoor macro station remote unit 106 that may be at least one of a dual mode outdoor macro station remote unit and a multi-mode outdoor macro station remote unit.

The remote unit 106 of the outdoor macro station is mainly responsible for converting the baseband signal into an intermediate frequency or radio frequency signal, and transmitting the signal to the uplink and downlink radio channels of the base station. The outdoor macro remote unit 106 is typically formed of radio frequency and digital processing circuitry, which is a core component of the outdoor macro remote unit 106, an antenna interface, power management and control, and the like. The outdoor macro remote unit 106 is connected to the base station controller (or baseband processor) via radio frequency cable or fiber optic and transmits and receives signals via an antenna. In the LTE system, the outdoor macro station remote unit 106 may also implement a multiple input multiple output (Multiple Input Multiple Output, abbreviated as MIMO) technology, so as to improve the transmission rate and coverage of the wireless network.

The outdoor macro station remote unit 106 in the embodiment of the present application may use dual mode devices to turn on the 4G and 5G air interface radio frequencies on different carriers, and simultaneously provide 4G and 5G single-path signals.

The arrangement of the outdoor macro station remote unit 106 in the embodiment can enable the offshore wind farm communication system to have better network performance.

In one embodiment, the system further comprises an outdoor antenna disposed on the booster stage, one end of the outdoor macro station remote unit 106 is connected to the baseband processing unit 104 through an optical fiber, and the other end of the outdoor macro station remote unit 106 is connected to the near-end machine 202 and the outdoor antenna through a feeder line, respectively.

In this embodiment, the outdoor macro station remote unit 106 is connected to the near-end machine 202 and the outdoor antenna through the feeder line by the outdoor antenna disposed on the booster platform, so as to implement wireless network coverage of the booster platform and the wind turbine tower.

The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.

The above examples only represent a few embodiments of the present application, which are described in more detail and are not to be construed as limiting the scope of the claims. It should be noted that it would be apparent to those skilled in the art that various modifications and improvements could be made without departing from the spirit of the present application, which would be within the scope of the present application. Accordingly, the scope of protection of the present application is to be determined by the claims appended hereto.

Claims

1. An offshore wind farm communication system, the system comprising:

the communication base station is arranged on a boosting platform of the offshore wind power plant and is used for providing radio frequency signals;

the second repeater is arranged in the tower barrel of the wind turbine generator in the offshore wind power plant and is connected with the first repeater;

and the passive distribution system is arranged in the tower barrel of the wind turbine generator and is connected with the second repeater.

2. The offshore wind farm communication system of claim 1, wherein the passive distribution system comprises a coupler, a power divider and a division antenna, wherein one end of the coupler is connected to the second repeater, the other end of the coupler is connected to one end of the power divider, and the other end of the power divider is connected to the division antenna.

3. The offshore wind farm communication system of claim 2, wherein the passive distribution system further comprises a feeder running along a wiring rack within the wind turbine tower.

4. An offshore wind farm communication system according to claim 3, wherein the feeder connection is employed between the second repeater and the coupler, between the coupler and the power divider, and between the power divider and the indoor antenna.

5. The offshore wind farm communication system of claim 1, wherein the communication base station comprises a baseband processing unit comprising at least one of a dual mode baseband processing unit and a multi-mode baseband processing unit.

6. The offshore wind farm communication system of claim 5, further comprising an outdoor antenna disposed on the boost platform.

7. The offshore wind farm communication system of claim 6, wherein the communication base station further comprises an outdoor macro station remote unit, one end of the outdoor macro station remote unit is connected to the baseband processing unit through an optical fiber, and the other end of the outdoor macro station remote unit is connected to the first repeater and the outdoor antenna through a feeder, respectively.

8. The offshore wind farm communication system of claim 7, wherein the outdoor macro station remote units comprise at least one of dual mode outdoor macro station remote units and multimode outdoor macro station remote units.

9. The offshore wind farm communication system of claim 1, wherein the first repeater comprises a near-end machine.

10. The offshore wind farm communication system of claim 9, wherein the second repeater comprises a remote machine connected to the near-end machine by a subsea fiber optic cable of the wind farm.