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- Type of Document: Ph.D. Dissertation
- Language: Farsi
- Document No: 49783 (05)
- University: Sharif University of Technology
- Department: Electrical Engineering
- Advisor(s): Mokhtari, Hossein; Blaabjerg, Frede
- Abstract:
- Proliferation of Distributed Generations (DGs) introduces higher reliability, stability, and quality as well as lower power losses and operational costs to the power systems. Integrating smart-grid and microgrid technologies to the power systems will further improve the overall performance of the system. Moreover, DC microgrids create an infrastructure to supply DC loads by DC sources such as photovoltaic arrays, fuel cell modules, as well as storages, which in case, increases the energy conversion efficiency. Operating DC microgrids together with AC microgrids, therefore, will form a new distrib-ution system called hybrid AC/DC systems, in which the DC side is dynamically decoupled from the AC side. Operating AC/DC/hybrid microgrids requires stable and appropriate power management strategies in order to control the load sharing among AC and DC sources as well as to improve the sharing accuracy, voltage regulation, and circulating power between AC/DC sub-grids. This thesis proposes a new power sharing approach in DC and hybrid microgrids, which improves the sharing accuracy and voltage regulation. Furthermore, an appropriate load sharing without overstressing the interlinking converters as well as circulating power between AC and DC sub-grids. Therefore, in this thesis, a new frequency based droop approach is proposed for power sharing control in DC microgrids. A merged frequency and voltage based droop approach is further presented in order to improve the sharing performance. An autonomous power sharing approach is given for power sharing control in grid connected DC microgrid through a single interlinking converter. Finally, a frequency droop based strategy is proposed for power sharing control in AC/DC hybrid microgrids. The proposed strategy improves the load sharing accuracy among interlinking converters and prevent overstressing the converters and circulating power between microgrids. The effectiveness of the proposed approach is evaluated by simulation and validated by experiment
- Keywords:
- Power Management ; Alternative Current Microgrid ; Direct Current Microgrid ; Alternative Current-Direct Current Hybrid Microgrid ; Frequency Droop ; Frequency Droop
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