student profile: Ms Nur Sabrina Md Noorpi


Thesis work

Thesis title: Planning and Operation of Nested Microgrids

Supervisors: Ke MENG , Joe DONG

Thesis abstract:

Recently, Microgrids have become an attractive option for power system operational strategy due to various technical and economic factors as the human need for electricity is increasing. Microgrids are a recent technology researched by researcher to improvise the current available power system network. Microgrids refer to integrated distribution systems consisting of distributed generators (DGs), loads, energy storage systems, and other onsite electric components. Microgrids can be considered as intelligent distribution systems with two different modes of operation: the islanded mode and the grid-connected mode. Microgrids have significant roles in the face of rising power demands, the falling cost of renewable sources, and the increasing need for supply resilience and autonomy for both on and off-grid. Several Energy Management Strategies (EMS) have been introduced to satisfy the optimization objectives such as cost minimization, load shedding minimization, system reliability maximization and supply adequacy maximization. Structured energy is a key step toward management of scarcity and of surplus. Nested Microgrids refers to the interconnection of multiple Microgrids into one network. Nested Microgrids, where critical facilities such as a local hospital, police, fire and rescue stations, public shelters, municipal water and wastewater systems, schools, housing, gas stations, grocery stores and other vital assets that are located in different areas of town can be served by a cluster of nodes. Nesting of Microgrids could be based on voltage levels of grid, load priority, amount of loads, power source type, customer privacy, etc. This study will focused on voltage levels of grid because in certain cases, a sub-network of the overall Microgrid may need to be operated at different voltage or at a greater reliability than the rest of the Microgrid. However, there are challenges to such a model. The nested architecture contains more points of coupling, requiring more interconnection and safety equipment. Moreover, non-critical loads must be disconnected during islanding. Imperialist competitive algorithm (ICA) will be applied to the Nested Microgrids system.

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