Industrial Optical Fiber Applications in Wind Power Generation
Time:
May 04,2024
In recent years, wind energy has gradually become a highly popular alternative power source, particularly well-suited to meeting the rapidly growing demand for energy. Unlike fossil fuels, which have limited sources and dwindling reserves, wind energy is entirely unrestricted and extremely easy to access. Converting wind energy into usable alternating current requires power electronic devices such as rectifiers and inverters. In high-power generation systems, electrical insulation plays a crucial role in ensuring the quality and reliability of power generation.
In recent years, wind energy has gradually become a highly popular alternative power source for meeting the rapidly growing demand for energy. Unlike fossil fuels, which have limited sources and dwindling reserves, wind energy is entirely unrestricted and extremely easy to obtain.
Converting wind energy into usable alternating current requires power electronic devices such as rectifiers and inverters. In high-power generation systems, electrical insulation plays a critically important role in ensuring the quality and reliability of power generation.
Fiber optic components provide protection by offering high-voltage pulse insulation and preventing unwanted signals from entering power electronic devices.
The main industrial fiber-optic applications in wind power systems include power electronic gate drives for rectifiers and inverters, control and communication circuit boards, wind turbine control units, condition monitoring systems, and grid integration of wind farms.
Wind turbine power generation
Wind turbines convert kinetic energy into electrical power by means of generators. As wind conditions fluctuate, the electricity generated by the generator must be converted accordingly to become usable. Therefore, wind turbines must be equipped with devices such as rectifiers, inverters, transformers, and filters, enabling the efficient transmission of the resulting alternating current over long distances, as shown in Figure 1.
Typically, transformer equipment is installed at the base of wind turbine towers to convert the low voltage generated by the wind turbines into medium- and high-voltage electricity that is easier to transmit.
Figure 1: Typical Functional Block Diagram of a Wind Turbine Generator System
[Caption]
Generator = Generator
Wind Turbine Blade = Wind turbine blade
Rectifier AC-DC = AC-DC rectifier
DC Link = DC Link
Inverter DC-AC = DC-AC inverter
Fiber Optic = Fiber Optic
Control Board and Communication = Control and Communication Circuit Board
Turbine Control Unit (TCU) = Turbine Control Unit (TCU)
3-Phase Line Filter and Transformer = 3-phase line filter and transformer
Utility Grade AC Power = Utility-grade AC power
Rectifier and Inverter
The rectifier and inverter are key components in wind turbine systems. The rectifier converts high-noise AC power into DC power, while the inverter converts DC power into clean, reliable AC power for output. The switching operations of these devices are typically controlled by an embedded digital signal processor (DSP) via a fiber-optic link, providing highly efficient and reliable control with excellent electrical insulation capabilities.
Basically, there are several options available for the control switches in rectifiers and inverters, including insulated-gate bipolar transistors (IGBTs), gate-turn-off thyristors (GTOs), integrated-gate-commutated thyristors (IGCTs), symmetrical gate-commutated thyristors (SGCTs), and emitter-turn-off thyristors (ETOs).
Fiber-optic components are widely used in high-voltage and high-current switching devices to provide reliable control and feedback signals. Please refer to Figures 2 and 3.
Figure 2: Typical functional block diagram of a typical IGBT gate-drive circuit implemented using the Avago HFBR-0500Z Versatile Link universal link transceiver.
Control Board = Control Circuit Board
Versatile Link HFBR-0500Z series = Versatile Link Universal Link HFBR-0500Z Series
Driver Logic and Protection Functions = Driver Control Logic and Protection Functions
Gate Driver = Gate driver
Driver = Driver
Figure 3: Typical phase connection diagram of a two-stage ETO voltage source converter using the HFBR-0500Z transceiver.
[Caption]
Over Current Protection = Overcurrent Protection
PWM Command = PWM command
Current Control = Current Control
Controller = Controller
Versatile Link HFBR-0500Z series = Versatile Link Universal Link HFBR-0500Z Series
POF = POF plastic optical fiber
Gate Driver = Gate driver
Condition Monitoring System
Most modern wind turbines are equipped with intelligent features that can monitor and control the system according to different wind conditions. For example, atmospheric environment sensors can detect wind speed and wind direction, while other sensors can be used to monitor the condition and strength of turbine components, helping to prevent potential problems.
Wind turbines must be able to withstand extreme weather conditions, such as blizzards or lightning strikes. In such situations, it is crucial to ensure that the turbine’s monitoring system is designed with high-voltage and high-current isolation capabilities. Compared to optocouplers and other similar devices, optical fibers offer significantly higher voltage and current isolation performance, making them a superior choice for signal transmission.
Wind turbines and wind farms connected to the grid
The data collected by the condition monitoring system, combined with short-distance POF plastic optical fiber links used for each turbine fan, is typically multiplexed and connected to either hard-core fiber cables (HPCF) or multimode fiber optic cables. If the height of the wind turbine tower exceeds 100 meters, longer HPCF and multimode fiber optic cables may be required.
Optical fibers possess inherent robustness, offering superior resistance to harsh environmental conditions and weighing very little. These characteristics make them exceptionally well-suited for vertical cabling requirements in wind turbine power generation.
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