Researchers at the University of Southern Denmark have developed an innovative drone system capable of autonomously recharging from overhead power lines, potentially revolutionizing long-duration drone operations.
Concept and Development
The concept of self-recharging drones using power lines emerged from the need to extend drone flight times for power line inspections. Developed by a team at the University of Southern Denmark, the system utilizes a Tarot 650 Sport carbon fiber drone frame customized with various components, including a 7,000-mAh lithium-polymer battery, a Raspberry Pi 4 B microcomputer, and a Pixhawk V6X autopilot module. The drone is equipped with a passively actuated power-line gripper and a cable guide consisting of two inward-sloping arms, allowing it to securely attach to power lines. This innovative approach enables drones to operate for extended periods without human intervention, potentially revolutionizing infrastructure inspection and maintenance practices.
Recharging Process
The recharging process begins when the drone’s onboard software detects a low battery level. Using its camera and millimeter-wave radar system, the drone locates the nearest power line and approaches it from underneath. The aircraft’s cable guide directs the line into the gripper, which closes around it without requiring electricity. Once secured, an inductive charger on top of the drone draws current from the power line. This innovative system allows the drone to remain attached to the line until fully charged, at which point the gripper releases and the aircraft resumes its mission. In field tests, a prototype demonstrated the ability to operate for over two hours, completing five cycles of inspection and charging.
Advantages of Technology
This innovative technology offers several key advantages for drone operations:
- Extended flight times, with drones demonstrating the ability to stay airborne for over two hours through multiple charging cycles
- Fully autonomous operation, reducing the need for human intervention in remote or difficult-to-access areas
- Improved cost efficiency by eliminating the need for drones to return to base stations for recharging
- Potential for continuous power line inspections without interruption
- Ability to install sensors across power grids in real-time, allowing utility companies to monitor assets more effectively
- Possible applications beyond power line inspections, such as long-distance autonomous delivery services5
The system’s capability to harvest energy from power lines also opens up possibilities for larger payloads and expanded operational ranges.
Challenges and Future Prospects
While promising, this technology faces significant challenges. Safety concerns arise from the potential for drones to damage power lines, potentially causing widespread outages. Regulatory and ethical issues surrounding the use of public infrastructure for drone charging also need to be addressed. Technically, the system’s effectiveness depends on power line voltage and inductive charging efficiency. Looking ahead, researchers aim to enhance the system’s resilience in various environmental conditions and expand its operational capabilities. Future iterations could enable long-distance, fully autonomous inspection or delivery services with minimal human intervention.
Source: Perplexity
