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Isolated Microgrid Planning with Solar Resource and Load Dynamics

Choubineh, Kianoosh | 2017

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 50065 (46)
  4. University: Sharif University of Technology
  5. Department: Energy Engineering
  6. Advisor(s): Fotuhi-Firuzabad, Mahmoud; Rajabi-Ghahnavieh, Abbas
  7. Abstract:
  8. In conventional planning methods for an isolated microgrid, loads’s performance is taken into account in a constant power factor. Also, Motor loads dynamics which might results in absorbing a reactive power up to a few times more than the load’s capacity isn’t considered in this methods. Another important issue in the microgrid’s stability is the microgrid’s spinning reserve. Due to the isolated microgrid’s disconnectivity and not considering these problems in small isolated microgrids, the possibility of an instability event in microgrid’s performance would rise enourmously. In this thesis, an isolated microgrid’s planning has been carried out based on a solar resource while taking into account the load’s dynamic. In order to include the load’s dynamic, it is mandatory to specify load’s demand for active power more accurately. Loads’s active power demand is devided into two types in this research. First type is the needed motor reactive power at its starting time which is called fast reactive power. The second type is consumed reactive power at its steady state which is called mid-term reactive power. In this research a bi-level programming method has been utilized for planning an isolated microgrid and competition between different tools for supplying the two mentioned types of reactive power is formed while maintaining microgrid’s spinning reserve in the intended span.the objective function in this planning problem is the total cost of the isolated microgrid which includes capital cost of the components in the first level and their operation cost in the second level of the problem.during the projects life time (15 year) also different constraints of the system such as power balance in the microgrid, microgrid spinning reserve and other constraints regarding components operation are inserted to this model. To determine the size of the microgrid’s compoenents in the first level, genetic algorithm has been utilized. In order to optimize microgrid’s performance in the second level during 1 day period, mixed integer linear programming has been utilized. The optimization problem results will determine size of the microgrid’s components and the components optimum performance schedule. Finally developed model is tested on a sample isolated microgrid with agricultural motor load and effect of different scenarios such as project life time, supporting reneable resources and building in impassable areas has been analysed. The results show that for supplying agricultural load in an isolated microgrid, using diesel generator and DSTATCOM for supplying the fast reactive power and using capacitor bank for injecting mid-term reactive power is cost efficient. In case which microgrid which microgrid isn’t equipped wiith neither diesel generator nor DSTATCOM, to maintain the correct performance, the photovoltaic system’s size will increase aboat 10% and in the worst case 20%. Compared to the conventional methods in which load’s dynamic isn’t considered, the photovoltaic system size increases which proves the effectiveness of this research in determining the right size of the solar isolated microgrid components
  9. Keywords:
  10. Renewable Energy Resources ; Microgird Planning ; Isolated Microgrid's Bi-level Planning ; Load's Dynamic ; Isolated Microgrid's Stability

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