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Dynamic Modelling of Nonlinear Droop-Controlled Islanded Microgrids and Optimum Placement of Renewable Energy Sources

2018, Master of Science in Engineering, University of Akron, Electrical Engineering.
Nonlinear droop control has been introduced to establish an effective power sharing between distributed generators without the need for communication links in microgrids (MGs). However, one of the missing studies in the literature is the effects of nonlinear droop relations on the stability of the MGs. In the first part of this thesis work, the stability of an inverter-based MG operating with the nonlinear frequency droop-control has been analyzed. A complete small-signal state-space linearized model of the MG system, with optimized nonlinear droop relations, has been developed considering the dynamics of the overall system, and is updated periodically. The stability of the system is then checked online at different operating points. Small signal stability analysis of an islanded microgrid was performed using MATLAB/Simulink and the results were experimentally verified on an MG setup.
Since renewable energy sources (RESs) usually have fast dynamics and low inertia, conventional generators could encounter large disturbances in their real power productions. As the magnitudes of the disturbance exceed certain limits, instability could be induced in the operation of various generators. In the second part of the thesis, the impact of installing certain RES capacity at specific nodes on the operation of the power system is proposed to be evaluated through developing a modified load flow analysis model to the MG system and analyzing the impact of the variation in RES production on the distributed generators. The proposed method automatically determines the optimum placement of the RES to improve the stability of the system. The optimum placement point is referred to as the center of mass point for the microgrid system.
Yilmaz Sozer (Advisor)
Malik Elbuluk (Committee Member)
Jose De Abreu-Garcia (Committee Member)

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Abdelgabir, H. (2018). Dynamic Modelling of Nonlinear Droop-Controlled Islanded Microgrids and Optimum Placement of Renewable Energy Sources . (Electronic Thesis or Dissertation). Retrieved from https://etd.ohiolink.edu/

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Abdelgabir, Hassan. "Dynamic Modelling of Nonlinear Droop-Controlled Islanded Microgrids and Optimum Placement of Renewable Energy Sources ." Electronic Thesis or Dissertation. University of Akron, 2018. OhioLINK Electronic Theses and Dissertations Center. 18 Nov 2018.

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Abdelgabir, Hassan "Dynamic Modelling of Nonlinear Droop-Controlled Islanded Microgrids and Optimum Placement of Renewable Energy Sources ." Electronic Thesis or Dissertation. University of Akron, 2018. https://etd.ohiolink.edu/

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