Largesignal Stability Analysis of E-SOP Based on T-S Fuzzy Modeling

Flexible interconnection devices enhance the ability of distribution network to accommodate large-scale distributed sources and loads, while the interactive coupling among high proportion of power electronic devices may affect the operational stability of the distribution network. To quantify the effects of system parameters, control modes, and control parameters on the stability of the interconnection systems between different distribution areas via Energy-storage Flexible Multi-State Switch (E-SOP), this paper conducts a study on the large-signal stability of E-SOP based on the T-S fuzzy model. According to the topology and control strategy of the E-SOP, the T-S fuzzy model is derived, the attraction domain estimation method based on the model is given, and the effects of the main circuit parameters, the parameters characterizing the operating point information, and the control parameters on the large-signal stability of the E-SOP are analyzed using the attraction domain. The theoretical analysis results are compared and analyzed with the time-domain simulation results to verify the correctness of the proposed method for estimating attraction domain to judge the large-signal stability of E-SOP using the T-S fuzzy model.