scholarly journals Classification of Transient Phenomena in Distribution System using wavelet Transform

2014 ◽  
Vol 65 (3) ◽  
pp. 144-150 ◽  
Author(s):  
Alireza Sedighi
Keyword(s):  
Wavelet Transform ◽  
Distribution System ◽  
Distribution Systems ◽  
Inrush Current ◽  
Efficient Procedure ◽  
Transient Phenomena ◽  
Capacitor Switching ◽  
Ground Fault ◽  
Electro Magnetic

Abstract An efficient procedure for classification of transient phenomena in distribution systems is proposed in this paper. The proposed method has been applied to classify some transient phenomena such as inrush current, load switching, capacitor switching and single phase to ground fault. The new scheme is based on wavelet transform algorithm. All of the events for feature extraction and test are simulated using Electro Magnetic Transient Program (EMTP). Results show high accuracy of proposed method.

scholarly journals Power Quality Disturbance Monitoring and Classification Based on Improved PCA and Convolution Neural Network for Wind-Grid Distribution Systems

Energies ◽  
2019 ◽  
Vol 12 (7) ◽  
pp. 1280 ◽  
Author(s):  
Yue Shen ◽  
Muhammad Abubakar ◽  
Hui Liu ◽  
Fida Hussain
Keyword(s):  
Neural Network ◽  
Power Quality ◽  
Distribution System ◽  
Classification Accuracy ◽  
Distribution Systems ◽  
Principal Component ◽  
Original Data ◽  
Convolution Neural Network ◽  
Four Levels

The excessive use of power semiconductor devices in a grid utility increases the malfunction of the control system, produces power quality disturbances (PQDs) and reduces the electrical component life. The present work proposes a novel algorithm based on Improved Principal Component Analysis (IPCA) and 1-Dimensional Convolution Neural Network (1-D-CNN) for detection and classification of PQDs. Firstly, IPCA is used to extract the statistical features of PQDs such as Root Mean Square, Skewness, Range, Kurtosis, Crest Factor, Form Factor. IPCA is decomposed into four levels. The principal component (PC) is obtained by IPCA, and it contains a maximum amount of original data as compare to PCA. 1-D-CNN is also used to extract features such as mean, energy, standard deviation, Shannon entropy, and log-energy entropy. The statistical analysis is employed for optimal feature selection. Secondly, these improved features of the PQDs are fed to the 1-D-CNN-based classifier to gain maximum classification accuracy. The proposed IPCA-1-D-CNN is utilized for classification of 12 types of synthetic and simulated single and multiple PQDs. The simulated PQDs are generated from a modified IEEE bus system with wind energy penetration in the balanced distribution system. Finally, the proposed IPCA-1-D-CNN algorithm has been tested with noise (50 dB to 20 dB) and noiseless environment. The obtained results are compared with SVM and other existing techniques. The comparative results show that the proposed method gives significantly higher classification accuracy.

Recognition of the Single-Phase Ground Fault in Power Distribution System

2011 ◽  
Vol 480-481 ◽  
pp. 1581-1586
Author(s):  
Jun Zhang
Keyword(s):  
Power Distribution ◽  
Distribution System ◽  
Distribution Systems ◽  
Single Phase ◽  
Transient State ◽  
Power Distribution Systems ◽  
Power Distribution System ◽  
Ground Fault ◽  
Analysis Computer ◽  
Novel Method

For power distribution systems, recognizing the single-phase ground fault is very difficult because there are several faults with similar features. This paper presents a novel method that can help to overcome this difficulty. The idea is to turns the original fault info into a whole system with transient state, steady state and transition state. Theoretical analysis, computer simulation and lab experiments verified the effectiveness of the proposed method.

scholarly journals Fault Section Estimation in Radial LVDC Distribution System Using Wavelet Transform

Energies ◽  
2021 ◽  
Vol 14 (24) ◽  
pp. 8486
Author(s):  
Hun-Chul Seo ◽  
Gi-Hyeon Gwon ◽  
Keon-Woo Park
Keyword(s):  
Wavelet Transform ◽  
Distributed Generation ◽  
Distribution System ◽  
Distribution Systems ◽  
Low Voltage ◽  
Rapid Development ◽  
Power Conversion ◽  
Stable Operation ◽  
Protection Method ◽  
Dc Line

The demand for low voltage DC (LVDC) distribution systems is increasing due to the rapid development of power conversion technology, the increase of DC-based digital loads, and the expansion of DC-based distributed generation (DG). For the stable operation of the LVDC distribution system, it is necessary to develop a protection method. In this paper, the fault section is estimated using wavelet transform (WT) in LVDC distribution system. The fault section is classified into a DC line and a DC bus. The characteristics of fault current at each fault section part are analyzed in simple and actual LVDC system. Based on this analysis, the algorithm for fault section estimation is proposed using the detail component after performing WT. The results of fault section estimations are verified through various simulations using EMTP and MATLAB. The fault section estimation can be utilized in the development of protection schemes in LVDC distribution system.

scholarly journals Study of Capacitor Bank Switching Transient in Distribution Network

2018 ◽  
Vol 248 ◽  
pp. 02004
Author(s):  
Indra Nisja ◽  
Mirza Zoni ◽  
Arnita
Keyword(s):  
Power Factor ◽  
Distribution System ◽  
Capacitor Bank ◽  
Inrush Current ◽  
Industrial System ◽  
Peak Voltage ◽  
Transient Phenomena ◽  
Large Motor ◽  
Power Factor Improvement ◽  
Capacitor Bank Switching

The power factor improvement has a great concern in the distribution system due to large motor installed in industrial system. The capacitor bank was installed to improve the power factor in the distribution system. Due to frequently capacitor bank switching has create transient phenomena in the distribution system and their effects the power quality. The aims of this research to study and simulate the effects of capacitor bank switching in the distribution system. The simulation has been conduct with PSIM software by modelled the system which contain of supply, load and three capacitor bank. The simulation was conducted with two conditions which are single bank and bank to bank switching. For single bank switching peak voltage of phase R reached about 60.9 kV and peak inrush current is reached about 6.7 kA. While for bank to bank switching the peak voltage of phase R reached as high as 59 kV and the peak inrush current is almost 8.2 kA.

Online Method for Location of Single Phase to Ground Fault through Cement Pole in Distribution Network

2014 ◽  
Vol 494-495 ◽  
pp. 1739-1742
Author(s):  
Hong Yu Yang
Keyword(s):  
Theoretical Analysis ◽  
Distribution System ◽  
Distribution Systems ◽  
Fault Location ◽  
Single Phase ◽  
Distribution Network ◽  
Voltage Gradient ◽  
Simulation Experiments ◽  
Location Method ◽  
Ground Fault

In China,most of distribution system is neutral noneffectively grounded. And the single-phase fault often happens through cement pole. In this paper,firstly,the voltage of the fault phase and the current of cement pole are derived in 10kV neutral noneffectively grounded distribution systems when cement pole has single-phase ground fault.Secondly,the online fault location method is proposed based on voltage gradient of cement pole.Thirdly,the resistence characristic of cement pole is analyzed and the distance obtained from the gradient voltage of cement pole is given.Finally, the theoretical analysis and simulation experiments show that the method is feasible.

scholarly journals Simplified Method for Single Line to Ground-Fault Location in Electrical Power Distribution Systems

2015 ◽  
Vol 5 (2) ◽  
pp. 221
Author(s):  
Mustapha Zahri ◽  
Youssef Menchafou ◽  
Hassane El Markhi ◽  
Mohamed Habibi
Keyword(s):  
Power Distribution ◽  
Distribution System ◽  
Distribution Systems ◽  
Fault Location ◽  
Electrical Power ◽  
Modern Society ◽  
Single Line ◽  
Power Distribution Systems ◽  
Ground Fault

<p>Power distribution systems play important roles in modern society. When distribution system outages occur, speedy and precise fault location is crucial in accelerating system restoration, reducing outage time and significantly improving system reliability, and then improves the quality of services and customer satisfaction. In this paper, we propose a reduced algorithm utilizing the sum of sending-end currents of the three phases to calculate the fault current, and therefore, avoid the iterative aspect of the classic algorithm for single line to ground fault location and reduce its computational charge. The test results are obtained from the numerical simulation using the data of a distribution line recognized in the literature.</p>

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