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Multiport Frequency-Dependent Network Equivalent Using a Modified Matrix Pencil Method
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DOI：10.1109/TPWRD.2014.2323335.png)
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摘要
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The paper presents a frequency-domain matrix pencil method (FDMPM) for identification of multiport network equivalents to be properly incorporated in electromagnetic transient calculations. In this method, a rational approximation for the network admittance matrix is inferred by the solution of a generalized eigenvalue problem. The obtained rational approximation is then employed to construct an Electromagnetic Transients Program-compatible multiport frequency-dependent network equivalent (FDNE). The proposed method is a direct process and requires no starting poles unlike the vector fitting method. It is also well suited to the matrix fitting applications with a common set of poles without any limitation on the number of poles. The FDMPM is first validated for calculating the time-domain response of a small three-port electrical circuit. It is then applied for the calculation of the FDNE of two networks; a 20-kV distribution system and a 230-kV regional transmission system. In each example, the accuracy of the proposed technique is verified by comparing the results with those obtained by detailed representation of the system.
Keyword:
Electromagnetic transient
frequency-dependent network equivalent (FDNE)
matrix pencil method
multiport system
rational approximation
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