Frequency dependent network equivalent for AC power systems using the QZ algorithm

In electromagnetic transients studies, only a small part of an AC power system can be modeled in detail. The remaining parts of the system should be reduced to the equivalent model. Different methods were developed to generate frequency dependent network equivalent (FDNE) models. These FDNE models consist of simple R, L, and C branches that reproduce the impedance frequency characteristic of the original system. A FDNE model for AC power systems using the QZ algorithm is proposed in this paper. The QZ algorithm obtains accurate resonance frequencies directly from the system equations to be used for finding the FDNE model parameters.