The wave energy conversion concept developed at Uppsala University is based on a buoy at sea level that is connected to a linear generator on the sea bed. The movements of the buoy riding the waves gets converted into electricity by the reciprocal movements of the translator inside the generator. To be able to compensate the negative impact of water level variations on power production, which is especially important at sites with high tidal range, a sea level compensation system to be placed on the buoy was developed. During development, the system used cellphone technology to communicate, which can be power demanding and is dependent on adequate cellphone reception. Since future wave power parks could be localized up to 10 km offshore, in rural areas of developing countries, a new approach is needed for communication with the sea level compensation system that is not dependent on cellphone reception at sea. In this report, a review of the regulations for radio communication and radio equipment in Sweden, Spain, Nigeria, Ghana and India is presented together with research of different possibilities of communication. Moreover, a new system for sending commands and receiving telemetry have been developed and have been tested for basic functionality, range and power efficiency. Due to differences in the countries regulations and uncertainties about conditions at the future sites of deployment, the programs in the system are to be easily adapted to function with different radios depending on the country of interest and the conditions at the site. Hence, a system layout have been proposed rather than a specific communication solution. The experimental setup developed has been tested over land with license free radios, over a range of 10 km in the vicinity of Uppsala. In the test, 100% of the transmitted commands were received and acknowledged within three attempts. The new control system for the buoys reduced the energy consumption from the previous development system by 90%.
| Identifer | oai:union.ndltd.org:UPSALLA1/oai:DiVA.org:uu-330936 |
| Date | January 2017 |
| Creators | Stetenfeldt, Andreas |
| Publisher | Uppsala universitet, Elektricitetslära |
| Source Sets | DiVA Archive at Upsalla University |
| Language | English |
| Detected Language | English |
| Type | Student thesis, info:eu-repo/semantics/bachelorThesis, text |
| Format | application/pdf |
| Rights | info:eu-repo/semantics/openAccess |
| Relation | UPTEC F, 1401-5757 ; 17052 |
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