SDU charges drone on high voltage-line

- We have just completed a test, where for the first time in the world we have connected a drone directly to a high voltage line with 150 kV (150,000 volts voltage, ed.), where it could charge the battery directly on the line. This is the first time we are testing on a real power line, after having tested the drone at HCA Airport for a long time, says associate professor and projectleader Emad Samuel Malki Ebeid from the Maersk Mc-Kinney Moller Institute. 

Thus, the researchers and the project manager pick up where the drone colleagues from SDU recently left off when they released health drones in the air between Svendborg and Ærø for the first time. 

First health drones - now energy drones 

Last week, a partnership of researchers from SDU and medical doctors from OUH launched health drones for transporting blood samples and medicine on South Funen in the so-called Health Drone project. At the same time, EU Commissioner Elisa Ferreira visited a drone conference in Odense to hear more about the potential of the flying robots. 

Now, SDU researcher Emad Samuel Malki Ebeid and the rest of the team have launched another great bit of drone news into the air on Funen with a result which is definitely world news. 

- So, in the future, a health drone, which has just started flying on South Funen, can connect to the energy network along the route if it needs more power when it has to fly far with a blood test or vital medicine, he states. 

Three projects launched by SDU 

The SDU drone has been developed in the project Drones4Energy, which has just been completed. The specially designed drone has for several years been tested and developed at the airport in collaboration with i.a. Energinet. 

The project, which was launched in 2018, has been followed by a new project called Drones4Safety. Here the focus is on inspecting bridges and railways, while the drone is charging the battery by connecting to the nearby power lines. 

With last week's test, the researchers have demonstrated that the technology works, says the project manager. 

- Now we have shown that we can land on the line and charge directly. This means that we can let swarms of autonomous drones place sensors and inspect the wires, which today must be disconnected and inspected by humans using lifts and helicopters, says Emad Samuel Malki Ebeid. 

Better use of the grid 

Today, Energinet, which is responsible for e.g. the 7000 km of high voltage power lines, has less than a handful of sensors on the grid. Using helicopters and lifts, the sensors are placed on the wires in parts of the grid that must first be disconnected for safety reasons. By leaving the interaction with the power lines to the drones, you can both avoid turning off the energy during installation and increase the monitoring of the network, because you can work with more sensors, and thus get a better use of the power lines. 

- Thus, among other things, we won’t need to decrease the power production from wind turbines for fear that the wires will be overloaded. This can increase the utilization of the grid by more than 20 percent, which is absolutely crucial if we are to increase the production of green electricity in Denmark, says the project manager. 

At Energinet, Lars Rasmussen, who is responsible for e.g. inspections of the Danish high-voltage network, participated in the entire process. He backs up the SDU researcher. 

- Today we are very careful about sending too much power through the lines, but with the help of the sensors we can get a better overview and constantly monitor how wind and weather affect the cables, which is very important for how we best utilize the capacity of the cables, he says. 

From five meters to 60 cm 

And not only can the partners now rejoice that the SDU-developed technology - unique in the world - enables the drone to land and charge directly on a high-voltage cable. They can carry out the inspections with far greater accuracy. 

Project manager Emad Samuel Malki Ebeid has just been visited by representatives of the EU's satellite project EGNOS. The European Geostationary Navigation Overlay Service (EGNOS) has been created to improve the accuracy and reliability of global navigation systems such as Galileo and GPS. 

- They were here to take a closer look at the GPS receivers we use in our drone. The accuracy is between zero to five meters, so there can be a big difference between, for example, where exactly it inspects a bridge. If we use the EGNOS system, we can get within 60 centimeters, and that means a lot when inspecting a section of a bridge or placing a sensor on a high-voltage line, he says. 

Emad Samuel Malki Ebeid and the two envoys from the EU-funded satellite program had expected that it would be necessary to replace the receivers, but it was enough to change the configuration, says an enthusiastic associate professor. 

- So, we can use our existing receivers instead of buying new ones costing 10 times as much - or more than 1000 euros, he says.