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Keywords: security weaknesses, key branch, spectral partitioning, centroid sorting technology. Abstract. The key branches of power system can effectively reflect the security weaknesses of transmission line, the efficiency of system secure economic dispatch and control will be significantly improved by reducing the system to a precise model with the key branches preserved. A new network reduction method of preserving the key branches is proposed. Firstly, the spectral partitioning method is used to extract the power network feather and the preserving key branches reduction system is modeled. And then, an improved centroid sorting technology is applied for obtaining the optimal reduced model. Lastly, an algorithm based on power transfer distribution factor for computing the reduced networks flows is presented.

Solution method of simplified classification power network model for Preserving Key Branches