Frequency-domain modeling of unshielded multiconductor power cables for periodic excitation with new experimental protocol for wide band parameter identification

Abstract

A complete modeling technique for unshielded power cables is proposed. The focus is on applications where the resonance phenomena take place in electrically long cables and is originated from periodic excitation, such as power converters. The resonance problems caused by switching converters tend to become more common with the advent of wide band gap semiconductors. This paper includes a new experimental protocol specific for unshielded power cable parameter identification in a wide frequency band, from DC up to medium frequencies (tens of MHz), with an impedance analyzer. It also introduces a frequency-domain simulation tool with conversion to the time domain, via the Fourier series. This frequency-domain modeling is straightforward, and its accuracy depends only on the accuracy of the cable parameter identification.

EMC Component Modeling and System-Level Simulations of Power Converters: AC Motor Drives

“…When the material and geometrical characteristics of the cable are not known, the p.u.l. parameters can also be extracted from measurements using an impedance meter [93,94], impedance analyzer [29,80,95,96], vector network analyzer (VNA) [18,[97][98][99][100], and combining the VNA measurements with time-domain reflectometry (TDR) [101] or impedance meter measurements [18] to accurately capture both DC, low, and high-frequency behavior.…”

“…Each segment is represented by an elementary cell containing the extracted p.u.l. RLGC parameters to model the transmission line that may have an additional RL ladder network to model for frequency-dependent skin and proximity effects, and an additional RC ladder network to model for frequency-dependent dielectric losses [29,80,82,[93][94][95][96][101][102][103][104].…”

Robust Filter Design Technique to Limit Resonance in Long Cables Connected to Power Converters

“…The frequency-domain simulator used along this document consists in the solution of (1)- (7) for each element of a discretized frequency vector ω[n]. This simulator is detailed and its results are experimentally validated in [15]. In the system presented in Fig.…”

“…The p.u.l. parameters of this cable have been experimentally identified in function of the frequency with an impedance [15] and [19]. The parameters of the cable are not included here, they are plotted in [15,Fig.…”

“…This simulator allows the most accurate representation of the cable frequency-dependent parameters, as it demands no approximations whatsoever. It has been validated experimentally with a resonant cable setup in [15].…”