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Electricity Supply with PV-Wind Systems for Houses Without Grid Connection
Dalarna University, School of Technology and Business Studies, Environmental Engineering.
Dalarna University, School of Technology and Business Studies, Environmental Engineering.
2006 (English)Independent thesis Advanced level (degree of Master (Two Years))Student thesis
Abstract [en]

The purpose of the work, through this thesis called “Electricity Supply with PV-Wind Systems For Houses Without Grid Connection” is to analyse the economical and technical feasibility of implementing a PV-Hybrid system in a certain region of Sweden. Within all the possible combinations of hybrid systems existent all around the world, a PV-Wind system has been chosen as the one to be analysed because of two reasons. The first is that nowadays, both photovoltaic and wind turbines technologies are suffering a big growth and second, this type of system is preferred because it is environmentally friendly in its totality. The system has been placed in Borlänge, a certain region of Sweden, in order to represent a most realistic environment as possible. For that, the two principal weather data, global irradiation and wind speed, have been taken from the Swedish Meteorology Institute. After that, an electrical load is needed to simulate all the energy supplying process during one year, so, a Swedish single family house has been chosen as the load. The electrical consumption of it has been studied, and three different load scenarios have been created. These three scenarios are a standard load case, an efficient load case and the last, a saving mode load case. Each one of load cases is divided through all the 8760 hours of the year. For the simulations of each one of the scenarios, a computer program called HOMER (Hybrid Optimization Model for Electric Renewables) has been utilized. With it, once you define the system and established the constraints of the system, it calculates all the possible configurations that can be implemented and arrange them by the Total Net Present Cost. One can visualize and check the energetic and economical characteristics of each one of the configurations in order to decide which one is the most appropriate. After all the scenarios have been simulated and evaluated, some of the final conclusions that can be done is that with such a system, only the saving load case could fulfil all the constraints and be economically feasible at the same time. For the established constraints, at least 70% of load covered, almost all of the configurations in the three different scenarios are feasible but since a minimum of comfort is needed in the house, the minimum level of covered load has been decided to be 90%. With this new restriction, only some of the configurations in the saving load case are technically and economically feasible, because with the other load cases the total net present cost is too high for this kind of investment and the material to install is probably too much for a single house. As an example, one of the best systems could be the one with 1kW PV and 2 wind turbines with a 20m hub height, producing a total electrical energy of 2444kWh/year. Nevertheless, and taking into account the low average of wind speed in this region, other hybrid systems should be studied for the future or also the same type of system but placed in a region with a higher average of wind speed.

Place, publisher, year, edition, pages
Borlänge, 2006. , p. 108
Identifiers
URN: urn:nbn:se:du-2217OAI: oai:dalea.du.se:2217DiVA, id: diva2:518058
Uppsok
Technology
Supervisors
Available from: 2006-06-20 Created: 2006-06-20 Last updated: 2012-04-24Bibliographically approved

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