Abstract
This paper presents a decoupled multi-port impedance modelling method of transmission network for stability analysis of inverter-fed power plant. The decoupled three-port and four-port impedance model are first derived. On the basis of them, multi-port impedance model of transmission network are deduced, where multiple branches-based transmission network is modelled by means of Norton equivalent circuit. In addition, stability analysis based on proposed impedance network modelling method is performed. Simulation results are given to validate effectiveness of the proposed decoupled multi-port impedance modelling and stability analysis method. The proposed modelling method is able to simplify impedance modelling procedure, which performs impedance based stability analysis for inverter-fed power plant with complicated transmission network in a computation-less way.
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