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This paper proposes a network decoupling method based on HolomorphicEmbedding (HE) for voltage stability analysis. Using the proposed HE methodwith a physical load scaling factor s, it develops a set of decoupled two-buscircuit channels between a target bus and the swing bus. Accordingly, acomplex-valued virtual index, named {\sigma}(s), is introduced in each channelto assess the voltage stability of prospective operating conditions withensured accuracy. Then the stability margin at each bus can be analyzed byvisualizing its respective {\sigma}(s) index on the {\sigma} plane with aunified boundary of voltage collapse. Moreover, benefitted by the embeddingwith physical loading, the trajectory of {\sigma}(s) for each bus with thevariation of operating conditions can be analytically given about the scalingfactor s. The effectiveness of proposed network decoupling method is verifiedon the IEEE 14-bus power system.

A Network Decoupling Method for Voltage Stability Analysis Based on Holomorphic Embedding