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A Framwork of Hierarchical Stability Region Analysis Approach for Networked Microgrids

A framework of a hierarchical stability region analysis approach for networked microgrids is proposed in this paper. Stability region analysis can depict the small-signal stability margin of a dynamic system geometrically in parameter space when operation point varies. In the system of networked microgrids, multiple uncertain renewable generation units in different microgrids lead to a high dimension of parameter space for the stability region analysis. Therefore, a hierarchical stability region analysis is employed to mitigate the high-dimension issue of the stability region analysis. In the lower level, the stability region of each microgrid can be calculated locally and respectively. While in the upper level, a conservative regular region is selected to achieve an equivalent decoupling of the power injections of different microgrids in stability region analysis. Case study is provided to verify the feasibility and efficiency of the proposed hierarchical stability region analysis.