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Determination of the Optimal Structure of Microgrids in an Active Distribution Network Considering Network Expansion Plans

Zandi Goharrizi, Amir Hossein | 2024

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 57024 (05)
  4. University: Sharif University of Technology
  5. Department: Electrical Engineering
  6. Advisor(s): Fotuhi Firuzabad, Mahmud
  7. Abstract:
  8. Several goals, including environmental issues, reducing dependence on fossil fuels, increasing resilience, reducing energy and power losses, and increasing system reliability, have encouraged policymakers and power companies to connect renewable distributed generation resources at the level of distribution networks. According to the mentioned points and needs, a discussion is raised in the form of modern distribution systems, called microgrids. On the other hand, today with the increase in electricity demand, microgrids play an important role in smart grids, which requires a new approach for optimal design and improving their performance. Also, dividing large distribution networks into a number of smaller networks can provide their better performance and control and have a significant impact on reliability indicators and other network characteristics. Therefore, the way of dividing the distribution network into multiple microgrids and determining the optimal structure of these microgrids is one of the important issues of power systems and especially its reliability. n this regard, in this research, first, the optimal location of distributed generation resources in the distribution system is determined. In the second step, by defining the objective function, a new method for dividing the distribution system into a number of microgrids is proposed. In this way, first, the optimal structure of microgrids is obtained based on the index of energy not supplied due to network failures. Then, the optimal location of the switches in the distribution network is determined in order to have the most self-sufficiency of the formed microgrids in supplying energy to their internal loads. Finally, the optimal structure of multiple microgrids is introduced based on both indicators and determined as two objectives. Then, in the third step, by adding the discussion of power system planning to the introduced objective function, the studies are completed. In this way, a number of lines are introduced as candidate Normally-Open (NO) lines for the development and expansion of the distribution network. Then, at the same time, a decision is made about the construction of each of these NO lines and the optimal location of the switches in the distribution network. Finally, the proposed method is simulated and analyzed on a test distribution network
  9. Keywords:
  10. Microgrid ; Distribution System ; Reliability ; Optimization ; Distributed Generation ; Electricity Distribution Network ; Distribution Networks Planning

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