Mike Barnes is a Professor in the Power Conversion group in the School of Electrical and Electronic Engineering with research interests in High Voltage DC Transmission, Offshore Wind Energy and Flexible AC Transmission Systems. He is also an Associate Editor of the IEEE Transactions on Energy Conversion. In a statement released this week by Manchester University, Professor Barnes discusses the HOME Offshore research project, funded by the UK Engineering and Physical Sciences Research Council (EPSRC), in associating with 5 leading UK universities. The project is investigating the use of advanced sensing, robotics, virtual reality models and artificial intelligence in order to reduce the cost and effort involved in maintaining offshore wind farms.
"Predictive and diagnostic techniques will allow problems to be picked up early, when easy and inexpensive maintenance will allow problems to be readily fixed" said Professor Barnes.
The University of Manchester is focussing on creating a new kind of circuit breaker design for offshore power networks.
"That’s because for long-distance offshore windfarms, direct current (DC) is a more cost-effective way to bring power back to shore than alternating current (AC).
Current windfarms are connected to the grid using conventional AC but the next generation of offshore wind farms, also known as ‘Round Three’ windfarms, will eventually lead to DC grids. Protection of these grids will require DC breakers, which is what the university is developing.
The UK generates more electricity from offshore wind than any other country in the world with around 5 percent of the country's annual electrical energy coming from the sector. This is expected to grow to 10 percent by 2020. Wind power is also a fundamental part of the Government’s decarbonisation targets with windfarm electricity capacity expected to rise from 5 Gigawatts (GW) currently, to between 20 GW and 40 GW in the next two decades. That will cost between £60 billion to £140 billion in the UK alone.
On a global scale, the potential is even bigger. Current policy plans says the world’s wind capacity could rise from 435 GW in 2015 to 977 GW by 2030. Of that 905 GW will come from onshore, but 72 GW will come from offshore wind.
Offshore windfarms have numerous benefits when compared to their land-based counterparts, such as size and geography. Building large scale windfarms on land takes up valuable space which just isn’t a problem offshore. But this does also come with its own challenges such as maintaining them and connecting them to the grid.
Based on the UK Government’s own projections for the deployment of offshore wind, the operation and maintenance of more than 5,500 offshore turbines could be worth almost £2 billion per annum by 2025. That’s an industry similar in size to the UK passenger aviation market.
Electricity generated from renewable sources presently accounts for around 25 percent of UK power demand. Current EU targets mean that by 2020, the UK must be generating 30 percent. To meet these expectations the expansion of UK’s offshore wind capacity has been proposed as one of the ways to achieve this. And by the end of 2015 it was reported that 92 percent of the worlds offshore wind installations were located in European waters".
In other words, the offshore wind industry could be a huge bonanza for the UK, but an assessment of technology options and the development of innovative solutions will be necessary in order to get the best value for UK bill-payers. This is what Manchester University is concentrating on, aiming to enable the UK to further lead the way in offshore wind.
Image: Old Quadrangle, Manchester University
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