Abstract
A microgrid can effectively improve the system reliability of a distribution network. When a fault occurs, the microgrid only has a determined division scheme under a fixed boundary method, and it is difficult to adapt to the random load and distributed power. In this paper, a novel renewable energy planning method considering the flexible region of the microgrid is proposed. Based on the randomness of the load and the output of distributed generations (DG) in the microgrid, the dynamic division method of the microgrid is proposed and the optimal allocation model of the distributed energy in the microgrid is established. Further, the model and method proposed are verified by the IEEE-33 bus test system. The simulation results show that the allocation of renewable energy in the microgrid considering the flexible region of the microgrid can effectively increase the utilization of renewable energy and improve the reliability of microgrid operation.
Highlights
With the development of human society, energy consumption has increased year by year.The consumption of fossil energy directly leads to an energy crisis and environmental protection problems
This paper studies the coordinated allocation of renewable energy considering the flexible region of the microgrid
The annual load loss and annual comprehensive benefits of the two different microgrid formation schemes are shown in Table 3, where the annual load loss considering the dynamic boundary is less than the microgrid considering the static boundary 33.45% and the annual comprehensive benefits considering the dynamic boundary are better than the microgrid considering the static boundary 26.65%
Summary
With the development of human society, energy consumption has increased year by year. The authors of [7] studied the bi-level optimization configuration method of an AC-DC microgrid considering the operation optimization of the microgrid, the distributed power generation and the demand side response to improve the economy and stability of the microgrid, and analyzed the influence of the intermittence and uncertainty of renewable energy generation on the optimal allocation of the microgrid. The power balance ensures the optimal operation of a single microgrid, which does not mean the overall optimal operation for microgrids Such a fixed boundary microgrid division method does not consider the impact of different microgrid divisions’ schemes on the distribution network. The construction and operation cost of the microgrid can be reduced and the operation efficiency of the microgrid can be improved by the coordinated configuration of renewable energy considering the flexible region of the microgrid and the demand side response. The model and calculation method proposed in this paper are verified by a test system
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