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Classification of power quality disturbances using quantum neural network and DS evidence fusion 基于量子神经网络和DS证据融合的电能质量扰动分类
European Transactions on Electrical Power Pub Date : 2012-05-01 DOI: 10.1002/ETEP.584
Zhengyou He, Haiping Zhang, J. Zhao, Q. Qian
{"title":"Classification of power quality disturbances using quantum neural network and DS evidence fusion","authors":"Zhengyou He, Haiping Zhang, J. Zhao, Q. Qian","doi":"10.1002/ETEP.584","DOIUrl":"https://doi.org/10.1002/ETEP.584","url":null,"abstract":"SUMMARY \u0000 \u0000A novel classifier based on Quantum Neural Network (QNN) and Dempster-Shafer (DS) evidence theory to recognize the types of power quality (PQ) disturbances is presented. According to the Discrete Wavelet Transform (DWT), Wavelet Packet Transform (WPT) and S-transform (ST) algorithms, three kinds of feature vectors extracted from the original signals are used to train three different quantum neural networks, then DS evidence theory is used for global fusion at the decision level to gain a unified classification result from the outputs of QNNs. Ten types of disturbances are considered for the classification problem. Simulation results indicate that the classification performance of QNN is better than back propagation neural network (BPNN). The recognition capability of the QNN-DS classifier is compared with BPNN-DS, probabilistic neural network with voting rules (PNN-VR) at the decision level, and only one QNN with information fusion at the feature level. It shows that the proposed classifier has good performance on recognizing single and multiple disturbances under different situations and can achieve a highest accuracy of all. Copyright © 2011 John Wiley & Sons, Ltd.","PeriodicalId":50474,"journal":{"name":"European Transactions on Electrical Power","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2012-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1002/ETEP.584","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"51120712","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 20
Accelerated Newton–Raphson power flow 加速牛顿-拉夫森功率流
European Transactions on Electrical Power Pub Date : 2012-05-01 DOI: 10.1002/ETEP.579
Gan Li, Xiao-Ping Zhang, Xi-Fan Wang
{"title":"Accelerated Newton–Raphson power flow","authors":"Gan Li, Xiao-Ping Zhang, Xi-Fan Wang","doi":"10.1002/ETEP.579","DOIUrl":"https://doi.org/10.1002/ETEP.579","url":null,"abstract":"SUMMARY \u0000 \u0000This paper introduces the Newton-like method of modifying the right-hand-side vector into the power flow solution. Based on this method, the accelerated Newton–Raphson (ANR) power flow algorithm is proposed. In the proposed algorithm, a constant Jacobian matrix in the correction equations is employed to reduce the computation burden, while the power mismatch vector is multiplied by a factor to guarantee the convergence. Case studies on different test systems under different loading levels are presented to show the accuracy and efficiency of the proposed power flow algorithm. Copyright © 2011 John Wiley & Sons, Ltd.","PeriodicalId":50474,"journal":{"name":"European Transactions on Electrical Power","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2012-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1002/ETEP.579","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"51120353","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 9
Approach for an integral power transformer reliability model 电力变压器整体可靠性模型的一种方法
European Transactions on Electrical Power Pub Date : 2012-05-01 DOI: 10.1002/ETEP.578
A. Schijndel, P. Wouters, E. Steennis, J. Wetzer
{"title":"Approach for an integral power transformer reliability model","authors":"A. Schijndel, P. Wouters, E. Steennis, J. Wetzer","doi":"10.1002/ETEP.578","DOIUrl":"https://doi.org/10.1002/ETEP.578","url":null,"abstract":"SUMMARYIn electrical power transmission and distribution networks power transformers represent a crucial group of assets both in terms of reliability and investments. In order to safeguard the required quality at acceptable costs, decisions must be based on a reliable forecast of future behaviour. The aim of the present study is to develop an integral transformer lifetime model which involves degradation mechanisms for most relevant subsystems, applicable to individual power transformers and transformer populations. In this paper, we present a predictive model for power transformer reliability which involves three essential ingredients: failure statistics, physical understanding of the degradation process, and actual knowledge of the present condition. The model is based on evaluation of existing literature and past experience on degradation mechanisms, failure modes and diagnostic techniques. The model is illustrated for integral reliability of three transformer failure modes, related to the degradation of the transformer winding insulation, of bushings and of tap-changers. Copyright © 2011 John Wiley & Sons, Ltd.","PeriodicalId":50474,"journal":{"name":"European Transactions on Electrical Power","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2012-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1002/ETEP.578","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"51120311","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 17
Multiwavelet transform based classification of PQ events 基于多小波变换的PQ事件分类
European Transactions on Electrical Power Pub Date : 2012-05-01 DOI: 10.1002/ETEP.581
Rajiv Kapoor, M. Saini
{"title":"Multiwavelet transform based classification of PQ events","authors":"Rajiv Kapoor, M. Saini","doi":"10.1002/ETEP.581","DOIUrl":"https://doi.org/10.1002/ETEP.581","url":null,"abstract":"SUMMARY \u0000 \u0000Wavelets have been used extensively in the recent past. The work presented uses multiwavelet because of its inherent property to resolve the signal better than all single wavelets. Multiwavelets are based on more than one scaling function. The resolution is better compared to Daubechies (D4) and hence the event can be detected from lesser number of samples as compared to Daubechies (D4). The proposed methodology utilizes an enhanced resolving capability of multiwavelet to recognize power system disturbances. Dempster–Shafer (DS), an intelligent classifier, has been implemented and tested for various PQ events. Two sub-classifiers, heuristic classifier and statistical classifier (χ2 distribution), have been used to support and strengthen the structural identification and temporal distribution factor of DS classifier. Results on various PQ events, such as voltage sag, voltage swell, outage, interruption, impulsive-transient (IT), oscillatory-transient (OT), noise, and notching, show that multiwavelets can detect and classify different PQ events efficiently and consistently. Copyright © 2011 John Wiley & Sons, Ltd.","PeriodicalId":50474,"journal":{"name":"European Transactions on Electrical Power","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2012-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1002/ETEP.581","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"51120948","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 19
A new approach for load flow analysis of integrated AC–DC power systems using sequential modified Gauss–Seidel methods 一种基于序贯修正高斯-塞德尔方法的交直流综合电力系统潮流分析新方法
European Transactions on Electrical Power Pub Date : 2012-05-01 DOI: 10.1002/ETEP.570
S. Messalti, S. Belkhiat, S. Saadate, D. Flieller
{"title":"A new approach for load flow analysis of integrated AC–DC power systems using sequential modified Gauss–Seidel methods","authors":"S. Messalti, S. Belkhiat, S. Saadate, D. Flieller","doi":"10.1002/ETEP.570","DOIUrl":"https://doi.org/10.1002/ETEP.570","url":null,"abstract":"SUMMARY \u0000 \u0000The paper describes a new approach for the load flow calculations of integrated AC–DC system. A simple and reliable method for sequential modified Gauss and Gauss–Seidel power flow for AC–DC system is developed. This approach is based on applying nodal injection theory at all buses. The DC system is treated by the current injected to the buses where it is connected and its effect is reflected at internal buses by additional power injection. Iterations between AC and DC power flow algorithms are made to match boundary conditions between the two systems. In this approach, the active and reactive power and the AC voltages at the converter buses are considered as the interface between the AC and DC equations in each iteration step. The combined AC–DC equations are solved separately using sequential modified Gauss and Gauss–Seidel methods. The developed algorithm to solve the AC–DC power flow has been tested on the IEEE 9-bus test system. Copyright © 2011 John Wiley & Sons, Ltd.","PeriodicalId":50474,"journal":{"name":"European Transactions on Electrical Power","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2012-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1002/ETEP.570","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"51120444","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 33
A fast WT‐based algorithm to distinguish between transformer internal faults and inrush currents 基于小波变换的快速变压器内部故障与涌流识别算法
European Transactions on Electrical Power Pub Date : 2012-05-01 DOI: 10.1002/ETEP.576
A. Rahmati, M. Sanaye-Pasand
{"title":"A fast WT‐based algorithm to distinguish between transformer internal faults and inrush currents","authors":"A. Rahmati, M. Sanaye-Pasand","doi":"10.1002/ETEP.576","DOIUrl":"https://doi.org/10.1002/ETEP.576","url":null,"abstract":"SUMMARY \u0000 \u0000This paper presents a novel algorithm for power transformer differential protection which differentiates internal faults from magnetizing inrush currents and saturation of current transformers using wavelet transform. The technique is based on pattern recognition of the instantaneous differential currents using the high-frequency components generated during the disturbance. These components are extracted using a wavelet-based processor stage. In this method, an appropriate criterion at a suitable frequency range is developed. Using the developed criterion for three phases, internal faults are correctly detected in about 1/8th cycle after occurrence of the disturbance. The proposed algorithm is evaluated using generated data from simulation of a model power system using Electromagnetic Transients Program software. The performance of the proposed algorithm is tested in many different cases and promising results are obtained. Copyright © 2011 John Wiley & Sons, Ltd.","PeriodicalId":50474,"journal":{"name":"European Transactions on Electrical Power","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2012-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1002/ETEP.576","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"51120174","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 19
A new time-domain based power system frequency estimation algorithm 一种新的基于时域的电力系统频率估计算法
European Transactions on Electrical Power Pub Date : 2012-05-01 DOI: 10.1002/ETEP.572
H. Seyedi, M. Sanaye-Pasand
{"title":"A new time-domain based power system frequency estimation algorithm","authors":"H. Seyedi, M. Sanaye-Pasand","doi":"10.1002/ETEP.572","DOIUrl":"https://doi.org/10.1002/ETEP.572","url":null,"abstract":"SUMMARY \u0000 \u0000Frequency stability is one of the most important features of power systems. It is closely dependent on the value of system frequency. In the present day modern power systems, fast and accurate frequency estimation has become quite vital. Any mistake in accurate estimation of frequency may threaten the frequency stability or at least lead to system operation problems. In this paper, a new time-domain based power system frequency estimation algorithm is proposed. Different abnormal events such as frequency decline due to load-generation mismatch are modeled and ability of the new frequency measurement technique to track the frequency is tested. Performance of the new method is evaluated and compared with an existing frequency estimation algorithm. Simulation results confirm advantages of the new approach over the existing method. Copyright © 2011 John Wiley & Sons, Ltd.","PeriodicalId":50474,"journal":{"name":"European Transactions on Electrical Power","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2012-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1002/ETEP.572","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"51120500","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 15
Combined operation of converter-based distributed generation unit in DC distribution system in order to have premium power quality 基于变流器的分布式发电机组在直流配电系统中联合运行，以获得优质的电能质量
European Transactions on Electrical Power Pub Date : 2012-05-01 DOI: 10.1002/ETEP.573
R. Noroozian, G. Gharehpetian
{"title":"Combined operation of converter-based distributed generation unit in DC distribution system in order to have premium power quality","authors":"R. Noroozian, G. Gharehpetian","doi":"10.1002/ETEP.573","DOIUrl":"https://doi.org/10.1002/ETEP.573","url":null,"abstract":"SUMMARY \u0000 \u0000This paper studies a DC distribution system, which has been supplied by utility AC grid and converter-based distributed generation (DG) in order to provide an overall solution to power quality problems. The power flow control in DC distribution systems is achieved by network and storage converters, which have DC voltage controllers. A control strategy for these converters has been presented, which is based on DC voltage droop controller and a novel instantaneous power regulation scheme. Furthermore, this paper presents a simple DC bus voltage controller, which can be used for DC system voltage determination. Also, a novel control system has been proposed for DG and load converters. The simulation results, based on PSCAD/EMTDC software, show that DC distribution system including converter-based DG unit can provide the premium power quality. Copyright © 2011 John Wiley & Sons, Ltd.","PeriodicalId":50474,"journal":{"name":"European Transactions on Electrical Power","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2012-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1002/ETEP.573","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"51120052","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 4
Computer models for estimating the breakdown voltage of air in uniform and non‐uniform fields at 30 kHz 30 kHz均匀场和非均匀场中空气击穿电压的计算机模型
European Transactions on Electrical Power Pub Date : 2012-05-01 DOI: 10.1002/ETEP.585
D. Rodriguez, R. Gorur, P. Hansen
{"title":"Computer models for estimating the breakdown voltage of air in uniform and non‐uniform fields at 30 kHz","authors":"D. Rodriguez, R. Gorur, P. Hansen","doi":"10.1002/ETEP.585","DOIUrl":"https://doi.org/10.1002/ETEP.585","url":null,"abstract":"SUMMARY \u0000 \u0000This paper reports on the development of models to estimate the breakdown voltage of air in uniform and non-uniform gap configurations for the very low frequency (VLF) and low-frequency (LF) bands. The breakdown voltage of air at VLF/LF is considerably lower and has a larger dependency on ambient humidity than at 60 Hz. Both characteristics have been explained by increased space charge formation at the higher frequencies. The models are shown to be useful for predicting breakdown voltages at VLF/LF for uniform field gap spacings up to 125 mm and non-uniform field gap spacings up to 4 m. Copyright © 2011 John Wiley & Sons, Ltd.","PeriodicalId":50474,"journal":{"name":"European Transactions on Electrical Power","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2012-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1002/ETEP.585","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"51121802","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
External sensors in partial discharge ultra‐high‐frequency measurements in gas‐insulated substations 气体绝缘变电站局部放电超高频测量用外部传感器
European Transactions on Electrical Power Pub Date : 2012-05-01 DOI: 10.1002/ETEP.587
Ju Tang, Gang Wei, Xiaoxing Zhang
{"title":"External sensors in partial discharge ultra‐high‐frequency measurements in gas‐insulated substations","authors":"Ju Tang, Gang Wei, Xiaoxing Zhang","doi":"10.1002/ETEP.587","DOIUrl":"https://doi.org/10.1002/ETEP.587","url":null,"abstract":"SUMMARY \u0000 \u0000Although the ultra-high-frequency (UHF) method of detecting partial discharge (PD) in gas insulation substations (GISs) is an interesting research topic because of its remarkable anti-jamming ability, applying inner UHF sensors to detect PD in operational GISs is a difficult task. The structure of GISs and the characteristics of PD electromagnetic wave transmission and leakage are determined using external antenna sensors to detect PD signals based on the theory of linear antennas. Two decimetric-wave antennas with different detection bandwidths are made using techniques such as additional impedance, shielding and asymmetrical forms to measure UHF. The UHF external antenna sensor measurement system is able to collect PD signals from the GIS equipment, and its anti-jamming ability is better than that of the low-frequency sensor measurement system in the UHF band. Copyright © 2011 John Wiley & Sons, Ltd.","PeriodicalId":50474,"journal":{"name":"European Transactions on Electrical Power","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2012-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1002/ETEP.587","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"51122296","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 5
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