[논문]Applicability Comparison of Transmission Line Parameter Extraction Methods for Busbar Distribution Systems

Hasirci, Zeynep; Cavdar, Ismail Hakki; Ozturk, Mehmet

doi:10.5370/jeet.2017.12.2.586

[국내논문] Applicability Comparison of Transmission Line Parameter Extraction Methods for Busbar Distribution Systems 원문보기

Journal of electrical engineering & technology, v.12 no.2, 2017년, pp.586 - 593

Hasirci, Zeynep (Dept. of Electrical and Electronic Engineering, Karadeniz Technical University) , Cavdar, Ismail Hakki (Dept. of Electrical and Electronic Engineering, Karadeniz Technical University) , Ozturk, Mehmet (Dept. of Electrical and Electronic Engineering, Karadeniz Technical University)

Abstract ▼ AI-Helper

Modeling busbar distribution system as a transmission line is an important subject of power line communication in the smart grid concept. This requires extraction of busbar RLGC parameters, accurately. In this study, a comparison is made between conventional and modified method for the aspect of optimum RLGC parameters extraction in the 1 MHz to 50 MHz frequency band. The usefulness of these methods is shown both in time and frequency-domain analysis. The frequency-domain analyzes show that the inherent power of modified method can eliminate the errors especially due to the discontinuities arise in conventional method. This makes the modeling approach of modified method more advantageous for the busbars due to its robustness against disturbances in the S-parameters measurements which cannot be eliminated with the calibration procedure. On the other hand, time-domain simulations show that the transmission line representation of the modified method is closer to physical reality by handling causality issues.

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문제 정의

13, time domain analysis is given for both methods. The aim of the time-domain analysis is to show the performance of these parameters to represent a real physical system. First, a 50 ns width and normalized amplitude pulse signal is applied to the input of a 3 m length busbar defined with CM and MM (in Fig.

제안 방법

Due to providing an integrated communication medium for PLC, busbar distribution system should be examined as a part of the LV grid. For this purpose, the comparisons are made for busbar distribution system and their transmission line behavior for frequency band of interest (1 MHz to 50 MHz).
On the other hand, these modeling studies are important in terms of ensuring the causality requirements. For this reason, in this study, a comparison is made between the CM and the MM based on RLGC(f) modeling approach to show the effectiveness of the modeling approach on busbars. Thus, broadband characterization of busbar distribution system is made and applicability comparison between the CM and the MM is presented.
However, recent studies about extraction of RLGC parameters from measured S-parameters focus on a frequency-dependent RLGC(f) modeling for transmission lines. These studies use an optimization algorithm to find the parameters instead of calculating them directly. The results are more accurate and efficient in a large frequency band since they eliminate the discontinuity caused by the hyperbolic functions [17-23].
This study presents a comparison between CM and MM transmission line parameter extraction methods to show the usefulness of the two methods. Here, S-parameter measurements were conducted on 630 A current level busbar with VNA.

대상 데이터

In this study, an aluminum type busbar was selected due to its widespread usage. Its dielectric material between the conductors is polyester film. The default production length of the analyzed busbar is 3 m [24].

데이터처리

Visual comparisons of extracted transmission line parameters between CM and MM were given for a 3 m length 630 A current level busbar distribution system (L1- N port connection). In this study, the error between the real and imaginary parts of the S-parameters was calculated as the similarity criterion. Due to S₂₁ refers to transfer function of the system, a comparison between CM and MM with respect to the measurement were made via S₂₁ in Fig.

성능/효과

Here, S-parameter measurements were conducted on 630 A current level busbar with VNA. The results show that the inherent power of the MM, in this study, is capable of eliminating the errors due to the measurement faults. While the results indicate that the obtained RLGC values from both methods are roughly similar to each other, the results of MM are more practical to use without any unrealistic outcomes such as negative RLGC values.
The results show that the inherent power of the MM, in this study, is capable of eliminating the errors due to the measurement faults. While the results indicate that the obtained RLGC values from both methods are roughly similar to each other, the results of MM are more practical to use without any unrealistic outcomes such as negative RLGC values.

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