I. Industry Background: Rapid Wind Power Development Highlights Pain Points in Tower Communication
China’s wind power sector has expanded rapidly, ranking first globally in cumulative installed capacity for years. By June 2026, national wind power installed capacity reached 680 GW, forming a cornerstone of new energy power supply. With larger single-unit turbine capacity and taller towers, control systems are becoming refined and intelligent. The stability and real-time performance of in-tower communication directly determine turbine operational safety and power generation efficiency.
The communication distance between nacelle and tower base can reach 150–170 meters. High-power devices such as converters and inverters inside towers generate intense electromagnetic interference (EMI). Traditional copper-based CAN buses suffer from poor anti-interference performance and limited transmission range. Long-term operation easily causes signal distortion, abnormal messages, packet loss and communication latency. These issues impair critical services including pitch control, grid connection and equipment condition monitoring, triggering turbine alarms or even shutdowns.
To address CAN communication challenges inside wind towers, the Comark CI-AF22 CAN bus fiber optic repeater achieves lossless transparent conversion between CAN electrical and optical signals. Replacing copper cables with fiber optics isolates electromagnetic interference and breaks distance limits, ensuring reliable CAN communication for wind turbines at the hardware level.
II. Core Application Scenarios: Covering Three Key Turbine Control Systems
1. Pitch Control System Communication
The pitch control system stabilizes turbine speed, regulates loads and executes safe shutdowns. The main controller exchanges real-time data with pitch PLCs, sending pitch angle adjustment commands and collecting blade position, operating and fault data. It demands highly reliable communication with millisecond-level response.
The Comark CI-AF22 supports transparent pass-through of the CANopen protocol. No program or network modification is required, fitting multi-node CAN bus architectures widely used in wind power. It withstands complex EMI inside towers to guarantee accurate and timely delivery of commands and feedback data, eliminating pitch jitter, turbine shaking and forced shutdowns caused by communication anomalies.
2. Converter System Communication
Wind turbine converters contain machine-side and grid-side modules. They perform power conversion and power regulation via DSP, and exchange data with the main controller over CAN buses to realize grid connection/disconnection, speed control and active/reactive power regulation.
Frequent high-power startup and switching of converters produce severe EMI, which often leads to CAN message loss and command delays on conventional copper buses. Leveraging the galvanic isolation of fiber optics, the Comark CAN fiber repeater blocks EMI and surges. It stabilizes transmission of control commands and status data between main controllers and converters for precise grid-tied power generation and power regulation.
3. Long-Distance Nacelle-to-Tower-Base Main Controller Communication
The tower-base main controller enables bidirectional communication with nacelle and ground cabinet modules. It transmits massive data such as wind speed & direction, equipment temperature, rotational speed and turbine operating status, forming the core communication link for turbine scheduling and condition monitoring.
For the 150–170 m long span between nacelle and tower base, conventional copper CAN suffers heavy signal attenuation and unstable communication under strong electromagnetic conditions. The Comark CI-AF22 extends CAN bus range without signal loss, suppresses long-distance attenuation and isolates electromagnetic & common-mode interference, delivering all-weather, high-precision, loss-free data transmission for main control systems.
III. Core Product Advantages | Comark CI-AF22 CAN Bus Fiber Optic Repeater
1. Full Protocol Compatibility & Wide Adaptability
Equipped with two logically independent CAN buses. Compatible with CAN2.0A/B. Preloaded with 32 baud rate presets. Supports CANopen DIP-switch baud rate configuration and rate auto-adaptation. Seamlessly connects mainstream wind power main control, pitch and converter devices without system reconstruction.
2. Multi-layer Protection & Strong Anti-Interference Performance
2 galvanically isolated CAN ports with 1000V isolation. Ports have switchable 120Ω terminal resistors plus 4000V lightning protection. Effectively mitigates surges, static electricity and common-mode interference in wind farms to protect downstream precision control equipment.
3. Ring Redundancy & Self-Healing Capability
2×155 Mbps high-speed fiber ports. Supports proprietary Ci-ring ring network protocol. Link fault recovery time <20 ms to achieve millisecond-level self-healing and avoid total communication outage.
4. Visual O&M for Simplified Troubleshooting
5 dual-color LED status indicators. Relay alarm for fiber link failure and bus data anomalies. Equipment status is clearly visible to reduce on-site O&M and fault diagnosis effort.
5. Industrial-Grade Hardware for Harsh Installations
9~36 V DC isolated redundant power input, with 1500V power isolation and reverse polarity protection. IP40 protection rating, reinforced corrugated aluminum housing. Standard 35 mm DIN rail mounting for compact cabinet deployment.
6. Wide Temperature Operation for All-Climate Stability
Operating temperature: -40℃ ~ +75℃. Reliably works under extreme cold, heat and drastic temperature fluctuations at wind farms with no performance degradation year-round.
IV. Summary
Long-range signal attenuation, strong electromagnetic interference and corrupted/lost data are persistent bottlenecks for CAN bus communication inside wind turbine towers. The Comark CI-AF22 CAN bus fiber optic repeater integrates fiber galvanic isolation, lossless protocol pass-through, long-distance transmission, millisecond self-healing and industrial-grade high reliability. It serves the three major communication scenarios of turbine pitch, converter and main control systems, resolving wind farm communication risks at the physical layer and securing safe, efficient and stable operation of wind turbines.
