Abstract
Recently, the microgrid has becomes an attractive solution to improve the reliability of the power system and integrate more small-scale renewable energy resources in a well-controlled manner. The hierarchal control structure is proposed to improve the controllability and effectiveness of the microgrid. In this paper, a survey of the hierarchal control structure is presented in terms of functionalities and requirements of each level. The power quality control is independently studied including inertia control, harmonic, and unbalanced voltage compensation control. Also, the primary control level is reviewed based on two sub-levels namely output control level and power-sharing control level. The power-sharing level is classified based on the utilization of the communication network. Besides, the secondary control level is reviewed based on the functions provided by this level of control. Finally, the tertiary control level is briefly explained in the context of the hierarchal control structure.
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