The microgrid system is an answer to the necessity of increasing renewable energy\npenetration and also works as a bridge for the future smart grid. Considering the microgrid system\napplied to commercial building equipped with photovoltaic sources, the usage of a DC microgrid\narchitecture can improve the efficiency of the system, while ensuring robustness and reducing the\noverall energy cost. Given the power grid stress and the intermittency of the DC microgrid power\nproduction, backup power provision and load shedding operations may occur to stabilize the DC\nbus voltage. Based on the knapsack problem formulation, this paper presents a realistic optimization\napproach to shedding a building�s appliances, considering the priority of each appliance, and also\nconsidering a minimum amount of load that must be attended. The problem is solved by mixed\ninteger linear programming and the CPLEX solver. The proposed architecture ensures critical load\nsupply and voltage stabilization through the real-time operation of the operational algorithm allowing\nthe load shedding optimization approach to be applied without compromising the robustness of\nthe system. The results obtained by simulation prove that the DC microgrid is able to supply the\nbuilding power network by applying the load shedding optimization program to overcome, mainly,\nthe renewable energy intermittency.
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