Overhead Line Fault Location Using Wavelet Packet Decomposition and Support Vector Regression

2012 ◽  
Vol 516-517 ◽  
pp. 1396-1399
Author(s):  
Chun Guo Fei ◽  
Bai Li Su
Keyword(s):  
Transmission Line ◽  
Support Vector Regression ◽  
Fault Location ◽  
Wavelet Packet ◽  
Support Vector ◽  
Wavelet Packet Decomposition ◽  
Overhead Line ◽  
Pass Filter ◽  
Low Pass Filter ◽  
Low Pass

This paper realizes the fault location in overhead line by using wavelet packet decomposition (WPD) and support vector regression (SVR). All various types of faults at different locations and various fault inception angles on a 735kV-360km overhead line power system are used. The system only utilizes voltage signals with single-end measurements. WPD is used to extract distinctive features from 1/2 cycle of post fault signals after noises have been eliminated by low pass filter. A SVR is trained with features obtained from WPD and consequently used in precise location of fault on the transmission line. The simulation results show, fault location on transmission line can be determined rapidly and correctly irrespective of fault impedance.

scholarly journals Research on Amplifier Performance Evaluation Based onδ-Support Vector Regression

2014 ◽  
Vol 2014 ◽  
pp. 1-6
Author(s):  
Xing Huo ◽  
Aihua Zhang ◽  
Hamid Reza Karimi
Keyword(s):  
Performance Evaluation ◽  
Support Vector Regression ◽  
Computer Calculation ◽  
Support Vector ◽  
Pass Filter ◽  
Low Pass Filter ◽  
Evaluation Strategy ◽  
Support Vectors ◽  
Performance Indexes ◽  
Rbf Kernel

Focusing on the amplifier performance evaluation demand, a novel evaluation strategy based onδ-support vector regression (δ-SVR) is proposed in this paper. Lower computer calculation demand is considered firstly. And this is dealt with by the superiority ofδ-SVR which can be significantly improved on the number of support vectors. Moreover, the function ofδ-SVR employs the modified RBF kernel function which is constructed from an original kernel by removing the last coordinate and adding the linear term with the last coordinate. Experiment adopted the typical circuit Sallen-Key low pass filter to prove the proposed evaluation strategy via the eight performance indexes. Simulation results reveal that the need of the number ofδ-SVR support vectors is the lowest among the other two methods LSSVR andε-SVR under obtaining nearly the same evaluation result. And this is also suitable for promotion computational speed.

A microstrip planar lowpass filter with ultra-wide stopband using hexagonal-shaped resonators

Frequenz ◽  
2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Shu Jiang ◽  
Wenbo Wang ◽  
Le Ren
Keyword(s):  
Transmission Line ◽  
Harmonic Suppression ◽  
Lowpass Filter ◽  
Functional Area ◽  
Pass Filter ◽  
Low Pass Filter ◽  
High Impedance ◽  
Low Pass ◽  
Multiple Transmission

Abstract A microstrip planar lowpass filter with ultra-wide stopband up to 40 GHz is presented. The filter is designed based on four types of hexagonal-shaped resonators, producing multiple transmission zeroes and extending the stopband. The high-impedance transmission line is folded to make the circuit more compact and form the coupling gaps between the adjacent resonators. A pair of folded open stubs are added to enhance the cut-off rate. As a result, an ultra-wide stopband with 23rd-harmonic suppression has been attained. A demonstration filter has been designed and fabricated with 3 dB cut-off frequency of 1.70 GHz. The measured results show that the relative stop bandwidth of the low-pass filter (LPF) is 182% with suppression level of 25 dB, covering 1.85–40 GHz. The functional area size of the filter is 21.50 × 21.70 mm, which corresponds to 0.198λ g  × 0.200λ g (λ g is the guided wavelength at 3 dB cut-off frequency).

scholarly journals A Novel Approach To Diagnosis Of Analog Circuit Incipient Faults Based On KECA And OAO LSSVM

2015 ◽  
Vol 22 (2) ◽  
pp. 251-262 ◽  
Author(s):  
Chaolong Zhang ◽  
Yigang He ◽  
Lei Zuo ◽  
Jinping Wang ◽  
Wei He
Keyword(s):  
Analog Circuit ◽  
Support Vector ◽  
Band Pass Filter ◽  
Pass Filter ◽  
Low Pass Filter ◽  
Op Amp ◽  
Novel Approach ◽  
Low Pass ◽  
Diagnosis Accuracy ◽  
Incipient Fault

Abstract Correct incipient identification of an analog circuit fault is conducive to the health of the analog circuit, yet very difficult. In this paper, a novel approach to analog circuit incipient fault identification is presented. Time responses are acquired by sampling outputs of the circuits under test, and then the responses are decomposed by the wavelet transform in order to generate energy features. Afterwards, lower-dimensional features are produced through the kernel entropy component analysis as samples for training and testing a one-against-one least squares support vector machine. Simulations of the incipient fault diagnosis for a Sallen-Key band-pass filter and a two-stage four-op-amp bi-quad low-pass filter demonstrate the diagnosing procedure of the proposed approach, and also reveal that the proposed approach has higher diagnosis accuracy than the referenced methods.

A compact microstrip low-pass filter with ultra wide stopband using compact microstrip resonant cells

2016 ◽  
Vol 9 (5) ◽  
pp. 1023-1027 ◽  
Author(s):  
Saeed Roshani
Keyword(s):  
Transmission Line ◽  
Insertion Loss ◽  
Stop Band ◽  
Pass Filter ◽  
Low Pass Filter ◽  
High Impedance ◽  
Attenuation Level ◽  
Low Pass ◽  
High Rejection ◽  
Good Agreement

In this paper, a novel compact microstrip low-pass filter (LPF) with ultra wide stop band and sharp roll off, is proposed. In the proposed structure, a high impedance transmission line is loaded by compact microstrip resonant cells, which results in ultra wide stopband. The −3 dB cut-off frequency of filter is 1.5 GHz and the maximum insertion loss is <0.1 dB in the passband. The proposed LPF presents extremely wide stopband from 1.68 to 44 GHz, with more than the −20 dB attenuation level, which suppresses the 2nd to 29th harmonics with high rejection levels. The size of the proposed LPF is only 0.1 λg × 0.19 λg, which shows excellent size reduction. There is a good agreement between the simulated and measured results.

Stopband-Extended and Size-Miniaturized Low-Pass Filter Based on Interdigital Capacitor Loaded Hairpin Resonator with Four Transmission Zeros

Frequenz ◽  
2018 ◽  
Vol 72 (5-6) ◽  
pp. 221-226 ◽  
Author(s):  
Jia-Jia Wu ◽  
Lin Li
Keyword(s):  
Transmission Line ◽  
Pass Filter ◽  
Low Pass Filter ◽  
Interdigital Capacitor ◽  
Transmission Zeros ◽  
High Impedance ◽  
Compact Size ◽  
Low Pass ◽  
Hairpin Resonator

AbstractIn this paper, a compact low-pass filter (LPF) with wide stopband is proposed based on interdigital capacitor loaded hairpin resonator. The structure composed of an upper high-impedance transmission line, a middle interdigital capacitor, and a pair of inter-coupled symmetrical stepped-impedance stubs. Detailed investigation into this structure based on even-odd mode approach reveals that up to four transmission zeros can be generated and reallocated by choosing the proper circuit parameters. And owing to the aid of transmission zeros, the fabricated quasi-elliptic LPFs experimentally demonstrate a wide 20dB stopband from 1.4fcto 5.1fcusing a compact size of only 0.005 λg2.

The Fabrication of the Low Loss Transmission Line and Low Pass Filter using Surface Microelectromechanical Systems Technology

2004 ◽  
Vol 43 (5A) ◽  
pp. 2786-2790 ◽  
Author(s):  
Han-Shin Lee ◽  
Dong-Hoon Shin ◽  
Sung-Chan Kim ◽  
Byeong-Ok Lim ◽  
Tae-Jong Baek ◽  
...  
Keyword(s):  
Transmission Line ◽  
Microelectromechanical Systems ◽  
Low Loss ◽  
Pass Filter ◽  
Low Pass Filter ◽  
Low Pass
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