This interface is based on the concept of energy router and energy internet. The main goals of this thesis are the conceptualization, development and implementation of an appropriate interface among microgrids.
In this new community, microgrids can support each other and improve the overall performance of whole system. Hence, the concept of microgrid need to be extended to a larger scale, in which multiple MGs are interconnected to form multi-microgrid system. However, despite of their advantages, the massive integration of microgrids leads to crucial challenges for the grid operators in term of policy, operation and energy management. One of the most important and expensive elements in microgrids is the energy storage system, which enhances the flexibility and reliability for the distributed network. Each microgrid can be seen as a coherent entity, which can support network operation and management by using its distributed energy resources. Recently, distributed system such as a microgrid is an emergent solution in this new electricity mix network.
The large-scale integration of renewable energy leads to numerous technical and regulatory challenges. Simulations are carried out on the Matlab/Simulink platform, and the results have demonstrated the validity and reliability of the idea for microgrid interconnection as well as the corresponding control strategies for flexible energy flow. Various operational modes of the interconnected microgrids, facilitated by the energy router, are analyzed, and the corresponding control strategies are developed. The analytical model is established for the whole system, including the energy router, the interconnected microgrids and the main grid. Based on multiport bidirectional voltage source converters (VSCs) and a shared direct current (DC) power line, the energy router serves as an energy hub, and enables flexible energy flow among the adjacent microgrids and the main grid. The key idea is to establish complementary energy exchange between adjacent microgrids through a multiport electrical energy router, according to the consideration that adjacent microgrids may differ substantially in terms of their patterns of energy production and consumption, which can be utilized to compensate for each other's instant energy deficit. A novel and flexible interconnecting framework for microgrids and corresponding energy management strategies are presented, in response to the situation of increasing renewable-energy penetration and the need to alleviate dependency on energy storage equipment.
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