Group Equivalent Method of Induction Motors Considering Critical Stability Characteristics
In order to reduce the influence of the critical stability characteristics of induction motors on the induction motor group equivalence and improve the accuracy and applicability of the induction motor group equivalence model,an induction motor group equivalence method considering the safe critical voltage and critical clearing time is proposed.Firstly,the indicators that characterize the strength of the critical stability characteristics of the induction motor are analyzed and combined with a cluster analysis algorithm to classify the induction motor group into three groups with different stability.Secondly,based on the basic principle of induction motor group equivalence,the electrical parameters of the equivalent induction motor are solved.Finally,the IEEE-9 node system is used as an arithmetic example to compare the system response under different faults for the equivalent model obtained by the method in this paper and existing methods.The simulation results show that the equivalent model obtained by the method in this paper can better reproduce the operating characteristics of the original induction motor group.
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