To be able to optimally plan hydropower production Vattenfall has constructed an optimization tool. This tool is simplified to keep calculation times low. The solutions are therefore not trusted to be realizable. To test if a solution can be applied in reality, Vattenfall wants to make simulations with the optimization solution as input. The aim of this project has therefore been to construct a simulation model based on table data, the best possible description of reality available.The simulation model is regarded as reliable for visualization of a proposed plan. By using optimization solutions as input to the simulation model the feasibility of the optimization solution is tested. Simulations show that optimization solutions generally are not realizable. Therefore, the simulation model was designed to calibrate the approximated relation between flow and power used in the optimization model, using the simulation result. The optimization solutions after calibration came closer to feasibility. A margin of error under 1% can be expected, when looking at the complete time period. Instantaneous error can reach over 10% and are not decreased by calibration. By modifying the optimization solutions the simulation model can produce realizable solutions, but then optimality is lost. The modified solutions also often violatelegal boundaries, regarding for example water levels.The simulation times were aimed to be kept low, but results show that a simulation can take several times longer than an optimization with the same time steps. It also requires higher time resolution to produce reliable results leading to even longer simulation times.
| Identifer | oai:union.ndltd.org:UPSALLA1/oai:DiVA.org:uu-447064 |
| Date | January 2021 |
| Creators | Öberg, Anton |
| Source Sets | DiVA Archive at Upsalla University |
| Language | Swedish |
| Detected Language | English |
| Type | Student thesis, info:eu-repo/semantics/bachelorThesis, text |
| Format | application/pdf |
| Rights | info:eu-repo/semantics/openAccess |
| Relation | UPTEC ES, 1650-8300 ; 21020 |
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